Sertularella clausa Allman 1888
Sertularella clausa (Allman, 1888) Figs 1D, 5; Table 4 Sertularia clausa Allman, 1888: 54, pl. 25 figs 3, 3a. – Bedot, 1916: 219. Sertularella clausa. – Nutting, 1904: 93, pl. 21 figs 3-4 (reexamination of the type). – Bedot, 1918: 236. – Milstein, 1976: 84, figs 24, 35. non Sertularella clausa. – F...
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Zenodo
2017
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6029719 https://zenodo.org/record/6029719 |
| Summary: | Sertularella clausa (Allman, 1888) Figs 1D, 5; Table 4 Sertularia clausa Allman, 1888: 54, pl. 25 figs 3, 3a. – Bedot, 1916: 219. Sertularella clausa. – Nutting, 1904: 93, pl. 21 figs 3-4 (reexamination of the type). – Bedot, 1918: 236. – Milstein, 1976: 84, figs 24, 35. non Sertularella clausa. – Fraser, 1938: 141, pl. 20 fig. 10; 1948: 241. Sertularella argentinica El Beshbeeshy, 2011: 121, fig. 38 ( syn. nov. ). – Soto Àngel & Peña Cantero, 2015: 993, fig. 7A-B. non Sertularella argentinica. – Galea, 2007: 59, fig. 14A-C. – Galea et al ., 2007c: 312, fig. 3I (= Sertularella robustissima Galea, Häussermann & Försterra, sp. nov.). Sertularella gayi gayi. – Blanco, 1982: 157, figs 6-9 [non Ser- tularella gayi (Lamouroux, 1821) ]. Material examined: NHML 1888.11.13.41; Uruguay, off Montevideo, ca . 1097 m; colony composed of ca . 15 sterile stems, up to 1.2 cm high, as well as a slide (now dried out, Fig. 1D) containing a ca . 1.5 cm high, branched colony fragment, labeled “Challenger Stat. 320, Sertularia clausa , type, Monte Video, Depth 600 faths”. – ZMH C11882; FRV Walther Herwig , Argentine Shelf, no additional data; several colony fragments, up to 2 cm high, at least one gonotheca, identified as Sertularella argentinica El Beshbeeshy, 2011. – ZMH C12145; FRV Walther Herwig 31, Stn. 676, Argentine Shelf, off Provincia del Chubut, -43.80500° -59.53333°, 570 m; 22.06.1976; fragmentary, fertile colony with monosiphonic stems, on axis of dead antipatharian [material studied by El Beshbeeshy (2011), as S. argentinica ]. Description: Large, up to ca . 17 cm high, bushy, irregularly and much branched colonies with either mono- or reportedly polysiphonic stems. Monosiphonic parts divided into short, almost collinear, rather thick internodes, by means of oblique constrictions of the perisarc slanting in alternate directions, not always clearly demarcated; distally, a hydrotheca to each internode. Side branches originating not laterally, but in either front or rear side of the stem, from below the hydrothecal bases; 1 st internode slightly longer than subsequent ones; remainder of branches with similar structure as the stem; tips of branches commonly forming anastomoses with neighboring counterparts, resulting in much tangled, three-dimensional structure. Hydrothecae short, tronconical, adnate for slightly more than half their length to the corresponding internode; abaxial wall nearly straight to imperceptibly concave for most of its length, becoming convex below aperture; free adaxial wall slightly convex to nearly straight, surface smooth to wavy; rim with 4 short, triangular cusps separated by shallow embayments; renovations occasional; a 4-flapped operculum. Gonothecae borne on side branches, arising from below the hydrothecal bases; male similar to female; long, slender, tubular to spindle-shaped, tapering abruptly above origin, slightly constricted apically; lateral walls undulated; aperture distal, large, surrounded by 4 triangular cusps, and provided with a 4-flapped operculum. Dimensions: See Table 4. Remarks: Upon the comparison of the holotype of S. clausa with the Argentinean material assigned by El Beshbeeshy (2011) to his supposedly undescribed species, S. argentinica , it appears that both are indistinguishable morphologically (compare Figs 5A, B and 5C, D, as well as their respective measurements in Table 4). The former is an obviously young, sterile colony, with monosiphonic, unbranched or sparinglybranched stems, not surpassing 1.2 cm in height. Their mode of branching, with side branches arising in either the front or rear side of the stems, is peculiar and distinctive. Additionally, the frequent occurrence of terminal stolonization characterizes this species [present study; Blanco (1982, as S. gayi gayi )]. Distribution: Uruguay – off Montevideo (Allman, 1888). Argentina – scattered records from the Argentine Shelf, between 40°-53°S (El Beshbeeshy, 2011, as S. argentinica ); Provincia de Tierra del Fuego, Antártida e Islas del Atlántico Sur [ ca . 80 km off the northeastern coast of Isla de los Estados (Blanco, 1982, as S. gayi gayi )]. Burdwood Bank – Soto Àngel & Peña Cantero (2015, as S. argentinica ). Falkland Is. – off the SE coast (El Beshbeeshy, 2011, as S. argentinica ). : Published as part of Horia R. Galea, Dirk Schories, Verena Häussermann & Günter Försterra, 2017, Taxonomic revision of the genus Sertularella (Cnidaria: Hydrozoa) from southern South America and the subantarctic, with descriptions of five new species, pp. 255-321 in Revue suisse de Zoologie 124 (2) on pages 266-268, DOI: 10.5281/zenodo.893519 : {"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 years 1873 - 76, Zoology 23 (70): 1 - 90.", "Bedot M. 1916. Materiaux pour servir a l'Histoire des Hydroides. 5 e periode (1881 - 1890). Revue suisse de Zoologie 24 (1): 1 - 394.", "Nutting C. C. 1904. American hydroids. Part II. The Sertularidae. Special Bulletin of the United States National Museum 4 (2): 1 - 325.", "Bedot M. 1918. Materiaux pour servir a l'Histoire des Hydroides. 6 e periode (1891 a 1900). Revue suisse de Zoologie 26 (Suppl.): 1 - 376.", "Milstein A. 1976. Hydroidea de las costas Uruguayas. Dusenia 9 (3): 77 - 93.", "Fraser C. M. 1938. Hydroids of the 1932, 1933, 1935, and 1938 Allan Hancock Pacific Expeditions. Allan Hancock Pacific Expeditions 4 (3): 129 - 152.", "El Beshbeeshy M. 2011. Thecate hydroids from the Patagonian shelf (Coelenterata, Hydrozoa, Thecata). Edited by G. Jarms. Verhandlungen des Naturwissenschaftlichen Vereins in Hamburg 46: 19 - 233.", "Soto Angel J. J., Pena Cantero A. L. 2015. On the benthic hydroids from the Scotia Arc (Southern Ocean): new insights into their biodiversity, ecology and biogeography. Polar Biology 38 (7): 983 - 1007.", "Galea H. R. 2007. Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile. Zootaxa 1597: 1 - 116.", "Galea H. R., Haussermann V., Forsterra G. 2007 c. Cnidaria, Hydrozoa: latitudinal distribution of hydroids along the fjords region of southern Chile, with notes on the world distribution of some species. Check List 3 (4): 308 - 320.", "Blanco O. M. 1982. Adicion a los hidrozoos argentinos. I. Neotropica 28 (80): 153 - 164.", "Lamouroux J. V. F. 1821. Exposition methodique des genres de l'ordre des polypiers, avec leur description et celle des principales especes, figurees dans 84 planches, les 63 premieres appartenant a l'histoire naturelle des zoophytes d'Ellis et Solander. Agasse, Paris, 115 pp."]} |
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