Halecium flexile Allman 1888
Halecium flexile Allman, 1888 (Plate 2 A; Figs 2 A, B; 3 A; 4 A; Table 4) Halecium flexile Allman, 1888: 11, pl. 5 Fig. 2.― Ralph, 1958: 337, Fig. 12 L– O. Halecium delicatulum ― Millard, 1977: 7, Fig. 1 C, D.―Galea, 2007 ( pro parte ): 54, Fig. 12 I, J (not Fig. 12...
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Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium flexile |
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Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium flexile Galea, Horia R. Schories, Dirk Försterra, Günter Häussermann, Verena Halecium flexile Allman 1888 |
topic_facet |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium flexile |
description |
Halecium flexile Allman, 1888 (Plate 2 A; Figs 2 A, B; 3 A; 4 A; Table 4) Halecium flexile Allman, 1888: 11, pl. 5 Fig. 2.― Ralph, 1958: 337, Fig. 12 L– O. Halecium delicatulum ― Millard, 1977: 7, Fig. 1 C, D.―Galea, 2007 ( pro parte ): 54, Fig. 12 I, J (not Fig. 12 F–H = H. platythecum sp. nov.). not Halecium delicatulum Coughtrey, 1876 a: 299; 1876 b: 26, pl. 3 Figs 4, 5. Material examined . HF 9, Isla Santi Bañez, lat. - 54.91725, long. - 68.36317, 29.5 m, 16.xii. 2010, sample C 252: a 12 cm high sterile colony (MHNG-INVE- 86247). HF 9, NE of Channel Murray, lat. - 54.95097, long. - 68.40114, 16.xii.2010, 18 m, sample C 257: two sterile colonies, 9 and 13.5 cm high, respectively (MHNG-INVE- 86249). HF 11, SW of Isla Nalcayec, lat. - 46.10075, long. - 73.88970, 29.xi. 2011, 26.5 m, sample C 317: numerous polysiphonic stems, up to 7 cm high on dead gorgonian, some bearing either male or female gonothecae (MHNG- INVE- 86248). HF 11, Punta Garro, lat. - 46.31517, long. - 75.65203, 30.xi. 2011, 17.3 m, sample C 349: several polysiphonic stems, up to 7.5 cm high, some bearing either male or female gonothecae (MHNG-INVE- 86250). Punta Arenas, Faro San Isidro, lat. - 53.78174, long. - 70.97391, 25.ii.2010, 10 m, sample PTA002: several polysiphonic stems and fragments, up to 8.5 cm high, some bearing male gonothecae (MHNG-INVE- 86252). New Zealand, Wellington, Te Raekaihau, lat. - 41.3475, long. 174.7897, 1994, 0–2 m, female colony of Halecium delicatulum Coughtrey, 1876 mounted on microslide 6 (MHNG-INVE- 26669). Description . Colonies arising from creeping, tortuous, branched, anastomosing stolonal fibers grouped together so as to form a fascicled hydrorhiza. Young stems monosiphonic, mostly found at the periphery of colonies, being rapidly invested by additional tubes, thus giving rise to large, branched, polysiphonic colonies (Pl. 2 A). Stems divided into internodes by oblique nodes slanting in opposite directions. Internodes almost collinear (Fig. 2 A), even in the youngest stems, moderately long, with 2–3 basal annuli and a distal bulge; each giving rise to a well-developed latero-distal hydrophore, reaching the level of the distal node; a pseudodiaphragm on adaxial side (Fig. 2 B). Side branches arise singly from below the primary hydrophores; alternate, generally given off in the same plane or slightly displaced towards the front and/or rear side of the stem, giving the colony an almost planar appearance. Up to third-order branches in a well-developed colony. Hydrothecae borne on corresponding hydrophores, generally renovated up to four times; rather deep, margin strongly everted. Gonothecae given off from the primary hydrophores. Male ovoid, tapering in the lower third into indistinct pedicel, laterally flattened, with no evident aperture (Fig. 3 A 4). Female pyriform and greatly swollen, tapering basally into indistinct pedicel; distally, a centrally-placed, rounded aperture (Fig. 3 A 1–3). Cnidome (Fig. 4 A): microbasic heteronemes [(5.2–5.4) × 2.6 µm] and microbasic mastigophores [(6.6–6.9) × 2.0 µm] 6. Since no additional material preserved in liquid is available, the cnidome composition of this species could not be checked. In addition, based on literature data, it looks like no other museum samples corresponding to this nominal species are available elsewhere for re-examination. PLATE 2 . Preserved colony of Halecium flexile Allman, 1888 with numerous stems growing on axis of dead gorgonian (A), H. maximum sp. nov. (B), H. modestum sp. nov. (C), H. platythecum sp. nov. (D), and H. tehuelchum (d’Orbigny, 1842) (E). All photos by H.R.G. Scale bars: 2 cm (A–C) and 1 cm (D, E). Remarks . The material on which Allman (1888) established his species was gathered from two remote localities, viz . Marion Island and Tierra del Fuego. Totton (1930, p. 145) selected as the holotype the fertile specimen originating from the former locality. According to him, the Patagonian material “is similar to it but the hydranths are larger and the distal part of the hydrophore is deeper, measuring 0.075 mm compared with 0.050 mm; and it lacks gonothecae”. This statement, of poor informative value, casts some doubt on the identity of both specimens, instead of clarifying their relationships. Though rather concise, the account by Millard (1977) provides interesting insights into the knowledge of the present species. Her material from Crozet 7, assigned to H. delicatulum Coughtrey, 1876, possesses female gonothecae that are indistinguishable morphologically from those occurring in the Chilean samples, and contain a similar number of large oocytes. In addition, its occurrence on gorgonians (a common substrate for the Chilean specimens) suggests that our material most probably belongs to the same species. Taken together, the accounts by Allman and Millard, the illustrations of the type material by Ralph (1958, Fig. 12 L– O), as well as the present observations, allow us to provide the following diagnosis for H. flexile : colonies with polysiphonic stems, pinnately branched in almost one plane, composed of moderately long, collinear internodes, each bearing a well-developed hydrophore provided with an adaxial pseudodiaphragm and topped by a hydrotheca with everted rim; female gonotheca pyriform, conspicuously swollen distally, male ovoid and flattened laterally. According to that, it will be shown below that the colonies with monosiphonic stems examined earlier by Galea (2007, as H. delicatulum ) belong to a distinct species, H. platythecum sp. nov. The taxonomic position of several closely-related species of Halecium from the southern hemisphere has been a complex matter of debate for a long time, and the opinions of the taxonomists that have examined the type of H. flexile contrast radically. On one hand, Billard (1910) reached the conclusion that the nominal species H. gracile Bale, 1888 is not more than a synonym of it, with the former having priority. On the other hand, Totton (1930) rejected their synonymy, arguing that “ H. gracile is of smaller proportions, and the male gonothecae are considerably smaller and of different shape”. Meanwhile, Bale (1915, p. 246) followed Billard and included in the synonymy of H. flexile not only his H. gracile , but also his H. parvulum Bale, 1888, the latter being considered as the full growth form of H. gracile . Ultimately, other authors [ e.g. Ralph (1958), Millard (1975), Watson (1997, 2003a, 2008)] broadened the synonymy of this species group, in considering H. delicatulum as the oldest available name, and sunk in its synonymy the three nominal species mentioned above. Following examination of various samples from Chile, New Zealand, and southern Australia, it becomes clear that several morphologically similar species were lumped together as H. delicatulum . First of all, according to Ralph (1958) and the observations made by one of us (H.R.G.) on New Zealand material (sample MHNG-INVE- 26669), the following diagnosis for H. delicatulum given by Ralph (1958, p. 337) should be followed scrupulously: “short (up to 3.0 cm) erect monosiphonic stems with loose irregular branching; […] nodes twisted obliquely and sloping alternately in opposite directions; hydrothecal margin strongly everted; […] mature male gonotheca elongate oval, about 0.75 mm in length; mature female gonotheca about 1.0 mm in length, more or less oval in general outline, with two distinct peaks arising from the narrow sides at the distal end; aperture, in depression between the peaks”. Since all the New Zealand material studied by Ralph had colonies with monosiphonic stems, it is worth stressing that this is most probably the normal habit of this species. Accurate, recent illustrations of H. delicatulum were given by Schuchert (2005) and Galea & Schories (2012 b). Consequently, only those specimens of Halecium whose mature female gonothecae are laterally flattened and have the aperture situated “between two distinct blunt, heavy, tooth-like processes” (Ralph 1958, p. 336) should be considered as belonging to Coughtrey’s species. The drawing in Fig. 3 B allows the shape and size of the female gonotheca to be compared to those of related species. An additional record of H. delicatulum is, most probably, that of Marktanner-Turneretscher (1890, as H. parvulum 8), but possibly not that of Hartlaub (1901 a 9) (this assumption 7. The Crozet shelf, situated about 1000 km away from Marion Island, lets us to assume that the specimens examined by Millard (1971) were possibly conspecific with H. flexile . 8. The synonymy is mainly based on the typical shape of the female gonotheca and its high number and small size of oocytes depicted by Marktanner-Turneretscher (1890) in his Pl. 3 Fig. 22. 9. The trophosome in Hartlaub’s (1901 a) material was poorly illustrated, and the characteristic pseudodiaphragm was not depicted. In addition, the presence of a male colony is of poor informative value, and should be interpreted with caution. In addition, Ralph’s (1958) reading of Hartlaub’s text is obviously a misinterpretation, adding information that is missing from his account. Hartlaub clearly stated the following: “Das Material […] besteht nur aus einem kleinen Stück Rhizom, von welchem eine Gonothek entspringt”, which means that only one gonotheca, arising from the stolon, was present in the material studied. Although the gonotheca was originally described as broadly rectangular and laterally flattened (thus possibly male), Ralph stated that Hartlaub would have seen some gonothecae “rectangular in general outline and others with two peaks at the distal end”, thus concluding that “some at least of Hartlaub’s specimens of H. delicatulum were female in sex”. considers the trophosome alone), though both are from New Zealand. Based on the data from the literature, it is therefore assumed that the species may be endemic to New Zealand. Second, the haleciids with polysiphonic stems reaching up to 10 cm in height, included by Ralph in her diagnosis of H. delicatulum (p. 336), are characters belonging to other nominal species ( viz. H. flexile and H. parvulum ) that were sunk in its synonymy. Besides the lack of information on the female gonotheca of Allman’s species, Ralph concluded that the “complete similarity of internode, node, hydrotheca and male gonotheca of H. delicatulum and H. flexile leaves little doubt that the latter is a synonym of H. delicatulum ”. However, due to the lack of suitable material, she failed to explain “what factors cause the readily distinguishable differences in growth form and size”, the nature of these factors being not invoked ( e.g. ecological, geographical etc.). Third, the southeastern Australian material mentioned by Galea (2010 b, p. 8) was re-examined for this study. The colonies are exclusively composed of monosiphonic stems up to 3.5 cm high, their branching is irregular and attains the third order, the internodes are slightly zigzagging (Fig. 2 C), the primary hydrophores are rather short, but still exhibit a conspicuous pseudodiaphragm on their adaxial side, and the hydrothecal rim is only slightly everted (Fig. 2 D). Terminal stolonization occur quite abundantly, giving rise to additional erect stems, and the gonothecae are given off from both the stolons and stems. The cnidome (Fig. 4 B) is composed of three capsules: small ( ca . 3.4 × 1.4 µm), seed-shaped and large [(8.2 –9.0) × 2.6 µm], banana-shaped macrobasic heteronemes, as well as a microbasic mastigophore ( ca . 6.5 × 2.0 µm). A closer inspection of the gonothecae, previously described as female, revealed that they are, in fact, male 10. They are broadly ovoid in frontal view (Fig. 3 C) and lenticular when seen from above. Those that are already spent exhibit a small, apical, circular aperture resulting from the local perisarc being ruptured upon the release of gametes (Fig. 3 C 2). Since no female colonies could be observed, we assign, with a query, the present material to H. balei 11 Fraser (1911). If our specimens indeed belong to it, then Totton’s (1930) argument (see above) supporting its separation from H. flexile is entirely justified [compare Figs 2 A and 2 C, as well as Fig. 3 A 4 and Bale’s (1888) Fig. 3]. Moreover, the relationships between H. balei and H. parvulum should be clarified in light of modern taxonomy. Fourth, the relationships between H. antarcticum Vanhöffen, 1910 and H. flexile have been questioned, among others, by Totton (1930) and Galea & Schories (2012 b). According to Peña Cantero (2014), the female gonothecae of the former are comparatively larger, flattened fronto-dorsally, tapering rather abruptly below, with a wide distal aperture, leaving the passage of a large acrocyst, thus considerably different from Allman’s species. Fifth, given the scarcity of numerous old descriptions, the lack of illustrations and/or measurements, the sterile condition of the material studied, or the presence of either male or immature female gonothecae, and the lack of knowledge of the cnidomes, only hardly reliable comparisons could be made. For example, there are several records assigned to H. delicatulum from South America and neighbouring seas, of which some are unrecognizable even in the presence of female gonothecae (Blanco 1984 a), while others, based on sterile material ( e.g. Vervoort 1972), are simply unidentifiable. Distribution in Chile . The former record is from Canal Vicuña (Galea 2007), while the present ones range roughly between 46 ° and 55 °S. World records . A subantarctic species possibly occurring from Marion Island to Patagonia. 10. The sample, preserved in ethanol, was received partly dried out. Upon examination in an aqueous solution, the gonothecal content appeared blurred. After a long storage in formalin, the air bubbles had completely disappeared, allowing its content to be observed properly during the present study. 11. Fraser (1911) introduced the replacement name Halecium balei for H. gracile Bale, 1888 in order to avoid the homonymy with H. gracile Verrill, 1874. Halecium Halecium delicatulum Halecium flexile Allman, Halecium Halecium Halecium Halecium Halecium balei Coughtrey, 1876 1888 humeriformis maximum modestum platythecum tristaniensis Fraser, sp. nov. sp. nov. sp. nov. sp. nov. sp. nov. 1911 ……continued on the next page FIGURE 3 . A: Halecium flexile Allman, 1888 —female (A 1‒3) and male (A 4) gonothecae, and comparison with the female of H. delicatulum Coughtrey, 1876 (B) and the males of H. balei Fraser, 1911 (C). D: Halecium humeriformis sp. nov. —female (D 1‒3) and male (D 4) gonothecae. E: Halecium maximum sp. nov. —female gonothecae (E), compared to the female of H. tristaniensis sp. nov. (G); male gonothecae (F). H: Halecium modestum sp. nov. — female (H 1‒4) and male (H 5) gonothecae. I, J: Halecium platythecum sp. nov. —female (I) and male (J) gonothecae. Scale bar: 500 µm. : Published as part of Galea, Horia R., Schories, Dirk, Försterra, Günter & Häussermann, Verena, 2014, New species and new records of hydroids (Cnidaria: Hydrozoa) from Chile, pp. 1-50 in Zootaxa 3852 (1) on pages 12-17, DOI: 10.11646/zootaxa.3852.1.1, http://zenodo.org/record/286956 : {"references": ["Allman, G. J. (1888) Report on the Hydroida dredged by H. M. S. Challenger during the years 1873 - 76. Part II. - The Tubularinae, Corymorphinae, Campanularinae, Sertularinae and Thalamophora. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the year 1873 - 76, Zoology, 23 (70), 1 - 90.", "Ralph, P. M. (1958) New Zealand thecate hydroids. Part II. Families Lafoeidae, Lineolariidae, Haleciidae and Syntheciidae. Transactions of the Royal Society of New Zealand, 85 (2), 301 - 356.", "Millard, N. A. H. (1977) Hydroids from the Kerguelen and Crozet shelves, collected by the cruise MD. 0 3 of the Marion- Dufresne. Annals of the South African Museum, 73 (1), 1 - 47.", "Coughtrey, M. (1876 a) Critical notes on the New Zealand Hydroida. Transactions and Proceeding of the New Zealand Institute, 8, 298 - 302.", "Totton, A. K. (1930) Coelenterata. Part V. Hydroida. Natural History Report of the British Antarctic (\" Terra Nova \") Expedition, 1910. Zoology, 5 (5), 131 - 252.", "Billard, A. (1910) Revision d'une partie de la collection des hydroides du British Museum. Annales des Sciences Naturelles, Zoologie, Series 9, 11, 1 - 67.", "Bale, W. M. (1888) On some new and rare Hydroida in the Australian Museum collection. Proceedings of the Linnean Society of New South Wales, 2 (3), 745 - 799.", "Bale, W. M. (1915) Report on the Hydroida collected in the Great Australian Bight and other localities. Part III. Fisheries. Zoological (and Biological) Results of the Fishing Experiments carried out by F. I. S. \" Endeavour \", 1909 - 1910, 3 (5), 241 - 336.", "Millard, N. A. H. (1975) Monograph on the Hydroida of southern Africa. Annals of the South African Museum, 68, 1 - 513.", "Watson, J. E. (1997) The hydroid fauna of the Houtman Abrolhos Islands, Western Australia. In: Wells, F. E. (Ed.), The Marine Flora and Fauna of the Houtman Abrolhos Islands, Western Australia. Western Australian Museum, Perth, pp. 503 - 546.", "Watson, J. E. (2003 a) Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island. Memoirs of the Museum of Victoria, 60 (2), 151 - 180.", "Watson, J. E. (2008) Hydroids of the BANZARE expeditions, 1929 - 1931: the family Haleciidae (Hydrozoa, Leptothecata) from the Australian Antarctic Territory. Memoirs of the Museum of Victoria, 65, 165 - 178.", "Schuchert, P. (2005) Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa). Journal of Natural History, 39 (8), 607 - 639. http: // dx. doi. org / 10.1080 / 00222930400001319", "Galea, H. R. & Schories, D. (2012 b) Some hydrozoans (Cnidaria) from King George Island, Antarctica. Zootaxa, 3321, 1 - 21.", "Marktanner-Turneretscher, G. (1890) Die Hydroiden des k. k. naturhistorischen Hofmuseums. Annalen des k. k. Naturhistorischen Hofmuseums, 5, 195 - 286.", "Hartlaub, C. (1901 a) Hydroiden aus dem Stillen Ocean. Ergebnisse einer Reise nach dem Pacific (Schauinsland 1896 - 97). Zoologische Jahrbucher. Abteilung fur Systematik, Geographie und Biologie des Tiere, 14 (6), 349 - 379.", "Millard, N. A. H. (1971) Hydrozoa. In: van Zinderen Bakker, E. M., Winterbottom, J. M. & Dyer, R. A. (Eds.), Marion and Prince Edwards Islands. A. A. Balkema, Cape Town, pp. 396 - 408.", "Galea, H. R. (2010 b) Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic. Zootaxa, 2336, 1 - 18.", "Fraser, C. M. (1911) The hydroids of the west coast of North America. With special reference to those of the Vancouver Island region. Bulletin from the Laboratories of Natural History of the State University of Iowa, 6 (1), 3 - 91.", "Pena Cantero, A. L. (2014) Revision of the Antarctic species of Halecium Oken, 1815 (Cnidaria, Hydrozoa, Haleciidae). Zootaxa, 3790 (2), 243 - 280. http: // dx. doi. org / 10.11646 / zootaxa. 3790.2.2", "Blanco, O. M. (1984 a) Adicion a los hidrozoos argentinos. II. Revista del Museo de La Plata, 13 (147), 269 - 282.", "Vervoort, W. (1972) Hydroids from the Theta, Vema and Yelcho cruises of the Lamont-Doherty geological observatory. Zoologische Verhandelingen, Leiden, 120, 1 - 247."]} |
format |
Text |
author |
Galea, Horia R. Schories, Dirk Försterra, Günter Häussermann, Verena |
author_facet |
Galea, Horia R. Schories, Dirk Försterra, Günter Häussermann, Verena |
author_sort |
Galea, Horia R. |
title |
Halecium flexile Allman 1888 |
title_short |
Halecium flexile Allman 1888 |
title_full |
Halecium flexile Allman 1888 |
title_fullStr |
Halecium flexile Allman 1888 |
title_full_unstemmed |
Halecium flexile Allman 1888 |
title_sort |
halecium flexile allman 1888 |
publisher |
Zenodo |
publishDate |
2014 |
url |
https://dx.doi.org/10.5281/zenodo.6143170 https://zenodo.org/record/6143170 |
long_lat |
ENVELOPE(140.900,140.900,-66.735,-66.735) ENVELOPE(-55.233,-55.233,-61.250,-61.250) ENVELOPE(162.000,162.000,-76.550,-76.550) ENVELOPE(-81.366,-81.366,50.550,50.550) ENVELOPE(40.562,40.562,63.490,63.490) ENVELOPE(64.588,64.588,-70.326,-70.326) ENVELOPE(-63.583,-63.583,-64.833,-64.833) ENVELOPE(-67.017,-67.017,-68.100,-68.100) ENVELOPE(50.483,50.483,-66.850,-66.850) ENVELOPE(-63.579,-63.579,-64.870,-64.870) |
geographic |
Antarctic The Antarctic Patagonia King George Island Kerguelen Australian Antarctic Territory Pacific New Zealand Tristan Blanco Endeavour Dyer Pena Bakker Yelcho Schauinsland Edwards Islands Faro |
geographic_facet |
Antarctic The Antarctic Patagonia King George Island Kerguelen Australian Antarctic Territory Pacific New Zealand Tristan Blanco Endeavour Dyer Pena Bakker Yelcho Schauinsland Edwards Islands Faro |
genre |
Antarc* Antarctic Antarctica Edwards Islands King George Island Macquarie Island Marion Island Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctica Edwards Islands King George Island Macquarie Island Marion Island Tierra del Fuego |
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ftdatacite:10.5281/zenodo.6143170 2023-05-15T13:32:29+02:00 Halecium flexile Allman 1888 Galea, Horia R. Schories, Dirk Försterra, Günter Häussermann, Verena 2014 https://dx.doi.org/10.5281/zenodo.6143170 https://zenodo.org/record/6143170 unknown Zenodo http://zenodo.org/record/286956 http://publication.plazi.org/id/FFE052544768FFD8FFC68437590FA657 http://table.plazi.org/id/DF0FCBB24778FFC8FFB186465D02A4D2 http://zoobank.org/7DE3BCBA-E5F0-4F0D-B2FD-B5B59E4DAE51 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3852.1.1 http://zenodo.org/record/286956 http://publication.plazi.org/id/FFE052544768FFD8FFC68437590FA657 https://dx.doi.org/10.5281/zenodo.286958 https://dx.doi.org/10.5281/zenodo.286957 https://dx.doi.org/10.5281/zenodo.286959 https://dx.doi.org/10.5281/zenodo.286960 http://table.plazi.org/id/DF0FCBB24778FFC8FFB186465D02A4D2 http://zoobank.org/7DE3BCBA-E5F0-4F0D-B2FD-B5B59E4DAE51 https://dx.doi.org/10.5281/zenodo.6143171 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium flexile article-journal ScholarlyArticle Taxonomic treatment Text 2014 ftdatacite https://doi.org/10.5281/zenodo.6143170 https://doi.org/10.11646/zootaxa.3852.1.1 https://doi.org/10.5281/zenodo.286958 https://doi.org/10.5281/zenodo.286957 https://doi.org/10.5281/zenodo.286959 https://doi.org/10.5281/zenodo.286960 https://do 2022-04-01T11:00:27Z Halecium flexile Allman, 1888 (Plate 2 A; Figs 2 A, B; 3 A; 4 A; Table 4) Halecium flexile Allman, 1888: 11, pl. 5 Fig. 2.― Ralph, 1958: 337, Fig. 12 L– O. Halecium delicatulum ― Millard, 1977: 7, Fig. 1 C, D.―Galea, 2007 ( pro parte ): 54, Fig. 12 I, J (not Fig. 12 F–H = H. platythecum sp. nov.). not Halecium delicatulum Coughtrey, 1876 a: 299; 1876 b: 26, pl. 3 Figs 4, 5. Material examined . HF 9, Isla Santi Bañez, lat. - 54.91725, long. - 68.36317, 29.5 m, 16.xii. 2010, sample C 252: a 12 cm high sterile colony (MHNG-INVE- 86247). HF 9, NE of Channel Murray, lat. - 54.95097, long. - 68.40114, 16.xii.2010, 18 m, sample C 257: two sterile colonies, 9 and 13.5 cm high, respectively (MHNG-INVE- 86249). HF 11, SW of Isla Nalcayec, lat. - 46.10075, long. - 73.88970, 29.xi. 2011, 26.5 m, sample C 317: numerous polysiphonic stems, up to 7 cm high on dead gorgonian, some bearing either male or female gonothecae (MHNG- INVE- 86248). HF 11, Punta Garro, lat. - 46.31517, long. - 75.65203, 30.xi. 2011, 17.3 m, sample C 349: several polysiphonic stems, up to 7.5 cm high, some bearing either male or female gonothecae (MHNG-INVE- 86250). Punta Arenas, Faro San Isidro, lat. - 53.78174, long. - 70.97391, 25.ii.2010, 10 m, sample PTA002: several polysiphonic stems and fragments, up to 8.5 cm high, some bearing male gonothecae (MHNG-INVE- 86252). New Zealand, Wellington, Te Raekaihau, lat. - 41.3475, long. 174.7897, 1994, 0–2 m, female colony of Halecium delicatulum Coughtrey, 1876 mounted on microslide 6 (MHNG-INVE- 26669). Description . Colonies arising from creeping, tortuous, branched, anastomosing stolonal fibers grouped together so as to form a fascicled hydrorhiza. Young stems monosiphonic, mostly found at the periphery of colonies, being rapidly invested by additional tubes, thus giving rise to large, branched, polysiphonic colonies (Pl. 2 A). Stems divided into internodes by oblique nodes slanting in opposite directions. Internodes almost collinear (Fig. 2 A), even in the youngest stems, moderately long, with 2–3 basal annuli and a distal bulge; each giving rise to a well-developed latero-distal hydrophore, reaching the level of the distal node; a pseudodiaphragm on adaxial side (Fig. 2 B). Side branches arise singly from below the primary hydrophores; alternate, generally given off in the same plane or slightly displaced towards the front and/or rear side of the stem, giving the colony an almost planar appearance. Up to third-order branches in a well-developed colony. Hydrothecae borne on corresponding hydrophores, generally renovated up to four times; rather deep, margin strongly everted. Gonothecae given off from the primary hydrophores. Male ovoid, tapering in the lower third into indistinct pedicel, laterally flattened, with no evident aperture (Fig. 3 A 4). Female pyriform and greatly swollen, tapering basally into indistinct pedicel; distally, a centrally-placed, rounded aperture (Fig. 3 A 1–3). Cnidome (Fig. 4 A): microbasic heteronemes [(5.2–5.4) × 2.6 µm] and microbasic mastigophores [(6.6–6.9) × 2.0 µm] 6. Since no additional material preserved in liquid is available, the cnidome composition of this species could not be checked. In addition, based on literature data, it looks like no other museum samples corresponding to this nominal species are available elsewhere for re-examination. PLATE 2 . Preserved colony of Halecium flexile Allman, 1888 with numerous stems growing on axis of dead gorgonian (A), H. maximum sp. nov. (B), H. modestum sp. nov. (C), H. platythecum sp. nov. (D), and H. tehuelchum (d’Orbigny, 1842) (E). All photos by H.R.G. Scale bars: 2 cm (A–C) and 1 cm (D, E). Remarks . The material on which Allman (1888) established his species was gathered from two remote localities, viz . Marion Island and Tierra del Fuego. Totton (1930, p. 145) selected as the holotype the fertile specimen originating from the former locality. According to him, the Patagonian material “is similar to it but the hydranths are larger and the distal part of the hydrophore is deeper, measuring 0.075 mm compared with 0.050 mm; and it lacks gonothecae”. This statement, of poor informative value, casts some doubt on the identity of both specimens, instead of clarifying their relationships. Though rather concise, the account by Millard (1977) provides interesting insights into the knowledge of the present species. Her material from Crozet 7, assigned to H. delicatulum Coughtrey, 1876, possesses female gonothecae that are indistinguishable morphologically from those occurring in the Chilean samples, and contain a similar number of large oocytes. In addition, its occurrence on gorgonians (a common substrate for the Chilean specimens) suggests that our material most probably belongs to the same species. Taken together, the accounts by Allman and Millard, the illustrations of the type material by Ralph (1958, Fig. 12 L– O), as well as the present observations, allow us to provide the following diagnosis for H. flexile : colonies with polysiphonic stems, pinnately branched in almost one plane, composed of moderately long, collinear internodes, each bearing a well-developed hydrophore provided with an adaxial pseudodiaphragm and topped by a hydrotheca with everted rim; female gonotheca pyriform, conspicuously swollen distally, male ovoid and flattened laterally. According to that, it will be shown below that the colonies with monosiphonic stems examined earlier by Galea (2007, as H. delicatulum ) belong to a distinct species, H. platythecum sp. nov. The taxonomic position of several closely-related species of Halecium from the southern hemisphere has been a complex matter of debate for a long time, and the opinions of the taxonomists that have examined the type of H. flexile contrast radically. On one hand, Billard (1910) reached the conclusion that the nominal species H. gracile Bale, 1888 is not more than a synonym of it, with the former having priority. On the other hand, Totton (1930) rejected their synonymy, arguing that “ H. gracile is of smaller proportions, and the male gonothecae are considerably smaller and of different shape”. Meanwhile, Bale (1915, p. 246) followed Billard and included in the synonymy of H. flexile not only his H. gracile , but also his H. parvulum Bale, 1888, the latter being considered as the full growth form of H. gracile . Ultimately, other authors [ e.g. Ralph (1958), Millard (1975), Watson (1997, 2003a, 2008)] broadened the synonymy of this species group, in considering H. delicatulum as the oldest available name, and sunk in its synonymy the three nominal species mentioned above. Following examination of various samples from Chile, New Zealand, and southern Australia, it becomes clear that several morphologically similar species were lumped together as H. delicatulum . First of all, according to Ralph (1958) and the observations made by one of us (H.R.G.) on New Zealand material (sample MHNG-INVE- 26669), the following diagnosis for H. delicatulum given by Ralph (1958, p. 337) should be followed scrupulously: “short (up to 3.0 cm) erect monosiphonic stems with loose irregular branching; […] nodes twisted obliquely and sloping alternately in opposite directions; hydrothecal margin strongly everted; […] mature male gonotheca elongate oval, about 0.75 mm in length; mature female gonotheca about 1.0 mm in length, more or less oval in general outline, with two distinct peaks arising from the narrow sides at the distal end; aperture, in depression between the peaks”. Since all the New Zealand material studied by Ralph had colonies with monosiphonic stems, it is worth stressing that this is most probably the normal habit of this species. Accurate, recent illustrations of H. delicatulum were given by Schuchert (2005) and Galea & Schories (2012 b). Consequently, only those specimens of Halecium whose mature female gonothecae are laterally flattened and have the aperture situated “between two distinct blunt, heavy, tooth-like processes” (Ralph 1958, p. 336) should be considered as belonging to Coughtrey’s species. The drawing in Fig. 3 B allows the shape and size of the female gonotheca to be compared to those of related species. An additional record of H. delicatulum is, most probably, that of Marktanner-Turneretscher (1890, as H. parvulum 8), but possibly not that of Hartlaub (1901 a 9) (this assumption 7. The Crozet shelf, situated about 1000 km away from Marion Island, lets us to assume that the specimens examined by Millard (1971) were possibly conspecific with H. flexile . 8. The synonymy is mainly based on the typical shape of the female gonotheca and its high number and small size of oocytes depicted by Marktanner-Turneretscher (1890) in his Pl. 3 Fig. 22. 9. The trophosome in Hartlaub’s (1901 a) material was poorly illustrated, and the characteristic pseudodiaphragm was not depicted. In addition, the presence of a male colony is of poor informative value, and should be interpreted with caution. In addition, Ralph’s (1958) reading of Hartlaub’s text is obviously a misinterpretation, adding information that is missing from his account. Hartlaub clearly stated the following: “Das Material […] besteht nur aus einem kleinen Stück Rhizom, von welchem eine Gonothek entspringt”, which means that only one gonotheca, arising from the stolon, was present in the material studied. Although the gonotheca was originally described as broadly rectangular and laterally flattened (thus possibly male), Ralph stated that Hartlaub would have seen some gonothecae “rectangular in general outline and others with two peaks at the distal end”, thus concluding that “some at least of Hartlaub’s specimens of H. delicatulum were female in sex”. considers the trophosome alone), though both are from New Zealand. Based on the data from the literature, it is therefore assumed that the species may be endemic to New Zealand. Second, the haleciids with polysiphonic stems reaching up to 10 cm in height, included by Ralph in her diagnosis of H. delicatulum (p. 336), are characters belonging to other nominal species ( viz. H. flexile and H. parvulum ) that were sunk in its synonymy. Besides the lack of information on the female gonotheca of Allman’s species, Ralph concluded that the “complete similarity of internode, node, hydrotheca and male gonotheca of H. delicatulum and H. flexile leaves little doubt that the latter is a synonym of H. delicatulum ”. However, due to the lack of suitable material, she failed to explain “what factors cause the readily distinguishable differences in growth form and size”, the nature of these factors being not invoked ( e.g. ecological, geographical etc.). Third, the southeastern Australian material mentioned by Galea (2010 b, p. 8) was re-examined for this study. The colonies are exclusively composed of monosiphonic stems up to 3.5 cm high, their branching is irregular and attains the third order, the internodes are slightly zigzagging (Fig. 2 C), the primary hydrophores are rather short, but still exhibit a conspicuous pseudodiaphragm on their adaxial side, and the hydrothecal rim is only slightly everted (Fig. 2 D). Terminal stolonization occur quite abundantly, giving rise to additional erect stems, and the gonothecae are given off from both the stolons and stems. The cnidome (Fig. 4 B) is composed of three capsules: small ( ca . 3.4 × 1.4 µm), seed-shaped and large [(8.2 –9.0) × 2.6 µm], banana-shaped macrobasic heteronemes, as well as a microbasic mastigophore ( ca . 6.5 × 2.0 µm). A closer inspection of the gonothecae, previously described as female, revealed that they are, in fact, male 10. They are broadly ovoid in frontal view (Fig. 3 C) and lenticular when seen from above. Those that are already spent exhibit a small, apical, circular aperture resulting from the local perisarc being ruptured upon the release of gametes (Fig. 3 C 2). Since no female colonies could be observed, we assign, with a query, the present material to H. balei 11 Fraser (1911). If our specimens indeed belong to it, then Totton’s (1930) argument (see above) supporting its separation from H. flexile is entirely justified [compare Figs 2 A and 2 C, as well as Fig. 3 A 4 and Bale’s (1888) Fig. 3]. Moreover, the relationships between H. balei and H. parvulum should be clarified in light of modern taxonomy. Fourth, the relationships between H. antarcticum Vanhöffen, 1910 and H. flexile have been questioned, among others, by Totton (1930) and Galea & Schories (2012 b). According to Peña Cantero (2014), the female gonothecae of the former are comparatively larger, flattened fronto-dorsally, tapering rather abruptly below, with a wide distal aperture, leaving the passage of a large acrocyst, thus considerably different from Allman’s species. Fifth, given the scarcity of numerous old descriptions, the lack of illustrations and/or measurements, the sterile condition of the material studied, or the presence of either male or immature female gonothecae, and the lack of knowledge of the cnidomes, only hardly reliable comparisons could be made. For example, there are several records assigned to H. delicatulum from South America and neighbouring seas, of which some are unrecognizable even in the presence of female gonothecae (Blanco 1984 a), while others, based on sterile material ( e.g. Vervoort 1972), are simply unidentifiable. Distribution in Chile . The former record is from Canal Vicuña (Galea 2007), while the present ones range roughly between 46 ° and 55 °S. World records . A subantarctic species possibly occurring from Marion Island to Patagonia. 10. The sample, preserved in ethanol, was received partly dried out. Upon examination in an aqueous solution, the gonothecal content appeared blurred. After a long storage in formalin, the air bubbles had completely disappeared, allowing its content to be observed properly during the present study. 11. Fraser (1911) introduced the replacement name Halecium balei for H. gracile Bale, 1888 in order to avoid the homonymy with H. gracile Verrill, 1874. Halecium Halecium delicatulum Halecium flexile Allman, Halecium Halecium Halecium Halecium Halecium balei Coughtrey, 1876 1888 humeriformis maximum modestum platythecum tristaniensis Fraser, sp. nov. sp. nov. sp. nov. sp. nov. sp. nov. 1911 ……continued on the next page FIGURE 3 . A: Halecium flexile Allman, 1888 —female (A 1‒3) and male (A 4) gonothecae, and comparison with the female of H. delicatulum Coughtrey, 1876 (B) and the males of H. balei Fraser, 1911 (C). D: Halecium humeriformis sp. nov. —female (D 1‒3) and male (D 4) gonothecae. E: Halecium maximum sp. nov. —female gonothecae (E), compared to the female of H. tristaniensis sp. nov. (G); male gonothecae (F). H: Halecium modestum sp. nov. — female (H 1‒4) and male (H 5) gonothecae. I, J: Halecium platythecum sp. nov. —female (I) and male (J) gonothecae. Scale bar: 500 µm. : Published as part of Galea, Horia R., Schories, Dirk, Försterra, Günter & Häussermann, Verena, 2014, New species and new records of hydroids (Cnidaria: Hydrozoa) from Chile, pp. 1-50 in Zootaxa 3852 (1) on pages 12-17, DOI: 10.11646/zootaxa.3852.1.1, http://zenodo.org/record/286956 : {"references": ["Allman, G. J. (1888) Report on the Hydroida dredged by H. M. S. Challenger during the years 1873 - 76. Part II. - The Tubularinae, Corymorphinae, Campanularinae, Sertularinae and Thalamophora. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the year 1873 - 76, Zoology, 23 (70), 1 - 90.", "Ralph, P. M. (1958) New Zealand thecate hydroids. Part II. Families Lafoeidae, Lineolariidae, Haleciidae and Syntheciidae. Transactions of the Royal Society of New Zealand, 85 (2), 301 - 356.", "Millard, N. A. H. (1977) Hydroids from the Kerguelen and Crozet shelves, collected by the cruise MD. 0 3 of the Marion- Dufresne. Annals of the South African Museum, 73 (1), 1 - 47.", "Coughtrey, M. (1876 a) Critical notes on the New Zealand Hydroida. Transactions and Proceeding of the New Zealand Institute, 8, 298 - 302.", "Totton, A. K. (1930) Coelenterata. Part V. Hydroida. Natural History Report of the British Antarctic (\" Terra Nova \") Expedition, 1910. Zoology, 5 (5), 131 - 252.", "Billard, A. (1910) Revision d'une partie de la collection des hydroides du British Museum. Annales des Sciences Naturelles, Zoologie, Series 9, 11, 1 - 67.", "Bale, W. M. (1888) On some new and rare Hydroida in the Australian Museum collection. Proceedings of the Linnean Society of New South Wales, 2 (3), 745 - 799.", "Bale, W. M. (1915) Report on the Hydroida collected in the Great Australian Bight and other localities. Part III. Fisheries. Zoological (and Biological) Results of the Fishing Experiments carried out by F. I. S. \" Endeavour \", 1909 - 1910, 3 (5), 241 - 336.", "Millard, N. A. H. (1975) Monograph on the Hydroida of southern Africa. Annals of the South African Museum, 68, 1 - 513.", "Watson, J. E. (1997) The hydroid fauna of the Houtman Abrolhos Islands, Western Australia. In: Wells, F. E. (Ed.), The Marine Flora and Fauna of the Houtman Abrolhos Islands, Western Australia. Western Australian Museum, Perth, pp. 503 - 546.", "Watson, J. E. (2003 a) Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island. Memoirs of the Museum of Victoria, 60 (2), 151 - 180.", "Watson, J. E. (2008) Hydroids of the BANZARE expeditions, 1929 - 1931: the family Haleciidae (Hydrozoa, Leptothecata) from the Australian Antarctic Territory. Memoirs of the Museum of Victoria, 65, 165 - 178.", "Schuchert, P. (2005) Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa). Journal of Natural History, 39 (8), 607 - 639. http: // dx. doi. org / 10.1080 / 00222930400001319", "Galea, H. R. & Schories, D. (2012 b) Some hydrozoans (Cnidaria) from King George Island, Antarctica. Zootaxa, 3321, 1 - 21.", "Marktanner-Turneretscher, G. (1890) Die Hydroiden des k. k. naturhistorischen Hofmuseums. Annalen des k. k. Naturhistorischen Hofmuseums, 5, 195 - 286.", "Hartlaub, C. (1901 a) Hydroiden aus dem Stillen Ocean. Ergebnisse einer Reise nach dem Pacific (Schauinsland 1896 - 97). Zoologische Jahrbucher. Abteilung fur Systematik, Geographie und Biologie des Tiere, 14 (6), 349 - 379.", "Millard, N. A. H. (1971) Hydrozoa. In: van Zinderen Bakker, E. M., Winterbottom, J. M. & Dyer, R. A. (Eds.), Marion and Prince Edwards Islands. A. A. Balkema, Cape Town, pp. 396 - 408.", "Galea, H. R. (2010 b) Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic. Zootaxa, 2336, 1 - 18.", "Fraser, C. M. (1911) The hydroids of the west coast of North America. With special reference to those of the Vancouver Island region. Bulletin from the Laboratories of Natural History of the State University of Iowa, 6 (1), 3 - 91.", "Pena Cantero, A. L. (2014) Revision of the Antarctic species of Halecium Oken, 1815 (Cnidaria, Hydrozoa, Haleciidae). Zootaxa, 3790 (2), 243 - 280. http: // dx. doi. org / 10.11646 / zootaxa. 3790.2.2", "Blanco, O. M. (1984 a) Adicion a los hidrozoos argentinos. II. Revista del Museo de La Plata, 13 (147), 269 - 282.", "Vervoort, W. (1972) Hydroids from the Theta, Vema and Yelcho cruises of the Lamont-Doherty geological observatory. Zoologische Verhandelingen, Leiden, 120, 1 - 247."]} Text Antarc* Antarctic Antarctica Edwards Islands King George Island Macquarie Island Marion Island Tierra del Fuego DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic Patagonia King George Island Kerguelen Australian Antarctic Territory Pacific New Zealand Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) Blanco ENVELOPE(-55.233,-55.233,-61.250,-61.250) Endeavour ENVELOPE(162.000,162.000,-76.550,-76.550) Dyer ENVELOPE(-81.366,-81.366,50.550,50.550) Pena ENVELOPE(40.562,40.562,63.490,63.490) Bakker ENVELOPE(64.588,64.588,-70.326,-70.326) Yelcho ENVELOPE(-63.583,-63.583,-64.833,-64.833) Schauinsland ENVELOPE(-67.017,-67.017,-68.100,-68.100) Edwards Islands ENVELOPE(50.483,50.483,-66.850,-66.850) Faro ENVELOPE(-63.579,-63.579,-64.870,-64.870) |