Halecium interpolatum Ritchie 1907

• Main Author: Watson, Jeanette E.
• Format: Text
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium interpolatum; Antarctic; Australian Antarctic Territory; Argentina; Blanco; Ritchie; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.4630628; https://zenodo.org/record/4630628

Halecium interpolatum Ritchie, 1907 Figure 7A, B Halecium interpolatum Ritchie, 1907: 526, pl. 1, fig 3, pl. 2, fig. 3.– Rees and Thursfield, 1965: 107, 197.- Smaldon et al , 1976: 17.- Stepanjants, 1979: 103, pl. 16, fig. 7.- Blanco, 1994a:156.- Blanco, 1994b: 186. Material examined. NMV F147466, Station 88, two microslides displaying small branch fragments; a preserved male colony. Description. Colonies branched, reaching a height of 30 mm. Hydrorhiza a mass of corrugated tubular stolons. Stems fascicled, lower stem region a loose aggregation of, stolons becoming polysiphonic tubes, passing along lower branches to mid-region of colony; stems thereafter profusely and irregularly branched. Younger branches monosiphonic, typically a single branch given offfroma geniculationofhydrophore belowa hydrotheca, sometimes a second branch given off on opposite side of hydrophore; branches rugose to deeply corrugated and jointed but lacking true nodes; joints transverse to weakly oblique. Hydrophores variable in length, often corrugated, typically a short more or less smooth segment below hydrotheca. Hydrotheca deep bowl-shaped, expanding strongly from diaphragm to margin; margin circular, rim strongly outrolled. Diaphragm distinct, some secondary and succeeding hydrophores arising in a linear series from diaphragm of preceding hydrotheca; hydrophores fairly short, typically deeply corrugated. Hydranths with c. 20 – 24 rather stubby tentacles, not well preserved. Male gonotheca ovoid to balloon-shaped, flattened, inserted on a very short narrow pedicel in an axil or in a hydrotheca, a minute apical protuberance visible in some gonothecae. Gonophores near maturity, almost filling cavity of gonotheca. Perisarc of stems and branches very thick, thinner on hydrotheca and gonotheca. Colour (preserved material), pale honey brown, youngest branches yellowish, gonophores darker brown. Measurements (μm) Branch distance between hydrothecae on 745 – 1470 branch width of smooth section of branch 134 – 158 Hydrotheca diameter at diaphragm 134 – 150 diameter at margin 269 – 300 depth, margin to diaphragm 95 – 134 Gonotheca length, including pedicel 869 – 909 maximum width 474 – 553 Remarks. Ritchie’s material of H. interpolatum was infertile, his description was general and lacked important dimensions. In many respects the present material falls within the range of dimensions of H. ovatum Totton, 1930 and measurements deduced from Ritchie’s description. Although the hydrocauli of the two species are superficially alike, the ovoid to quadrangular gonotheca of H. ovatum is considerably smaller than the lenticular gonotheca of H. interpolatum . Itherefore assign the present material to H. interpolatum . Distribution . South Orkneys. This is the first record of the species from Antarctica. : Published as part of Watson, Jeanette E., 2008, Hydroids of the BANZARE expeditions, 1929 – 1931: the family Haleciidae (Hydrozoa, Leptothecata) from the Australian Antarctic Territory, pp. 165-178 in Memoirs of Museum Victoria 65 on pages 171-172, DOI: 10.24199/j.mmv.2008.65.9, http://zenodo.org/record/4630462 : {"references": ["Ritchie, J. 1907 a. The hydroids of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh 45: 519 - 545.", "Rees, W. J. and. Thursfield. S. 1965. The hydroid collections of James Ritchie. Proceedings of the Royal Society of Edinburgh 69: 34 - 220.", "Smaldon, G., Heppell, D., and Watt, K. R. 1976. Type specimens of invertebrates (excluding Insects) held at the Royal Scottish Museum, Edinburgh. Information Series. Royal Scottish Museum, Natural History 4. i-iv, 1 - 118.", "Stepanjants, S. D. 1979. Gidroidy vod antarktiki i subantarktiki. In Rezul'taty biologicheskikh issledovanii Sovetskikh Antarkticheskikh Ekspeditsii, 6. Issledovaniya Fauny Morei 22: 1 - 99.", "Blanco, O. M. 1994 a. Claves de familias y generos para facilitar el reconocimiento de los Hydroida (Leptolina) Athecata, Thecata y LimnomedusaeArgentinos (generacionpolipoideexclusivamente). Revista del Museo de La Plata, new series 14, Zoologia 160: 147 - 179.", "Blanco, O. M. 1994 b. Enumeracion sistematica y distribucion geografica preliminar de los Hydroida de la Republica Argentina suborden Athecata (Gymnoblastea, Anthomedusae), Thecata (Calyptoblastea, Leptomedusae) y Limnomedusae. Revista del Museo de La Plata, new series 14, Zoologia 161: 181 - 216.", "Totton, A. K. 1930. Coelenterata. Part V. Hydroida. Natural History Report. British Antarctic Terra Nova Expedition 1910, Zoology 5: 131 - 252."]}