Halecium incertus Naumov & Stepanjants 1962

• Main Author: Peña Cantero, Álvaro L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium incertus; Antarc*; Antarctic; Enderby Land
• Online Access: https://doi.org/10.5281/zenodo.4630885; http://treatment.plazi.org/id/3E6287E02940FF9D2CA91EED3DB5FD61

Halecium incertus Naumov & Stepanjants 1962 (Figs 6–7) Halecium incertus Naumov & Stepanjants, 1962: 98, fig. 18; Stepanjants, 1979: 107, pl. 20 fig. 7A–V; Vervoort & Watson, 2003: 86; Peña Cantero, 2004: 769; Peña Cantero & Gili, 2006: 766. Halecium dufresnae Millard, 1977: 8, fig. 2A–D; 1979: 138; Branch & Williams, 1993: 11, fig.; Vervoort & Watson, 2003: 85. Halecium macrocaulus Watson, 2008: 173 –174, fig. 9A–F. Not Halecium incertus — Peña Cantero, 2008: 454 –455, fig. 1b; 2009: 1747; 2012: 857 (= Halecium pseudoincertus sp. nov. ). Material examined. Holotype of Halecium incertus , ZIRAS, “Ob” II SAE , Stn 204 , 30–02–1957, 65° 59,2S 57°08’8E (Enderby Land), 270 m, three stem fragments, 42, 32 and 30 mm long, with gonothecae. Holotype of Halecium macrocaulus , BANZARE , Stn 107 , 66°45'S 62°03'E (Mawson Coast), 210 m, one microslide, NMV F147467, one stem fragment, c. 24 mm long, with gonothecae. German Antarctic Expedition Polarstern XXI/2 : Stn PS65/019 , one stem, c. 195 mm high, with gonothecae. Diagnosis. Strongly polysiphonic, irregularly branched stems, up to 300 mm high. Branches originating from hydrophore of primary hydrotheca. Hydrothecae alternately arranged in one or two planes. Hydrotheca at the end of short, adnate hydrophore provided with oblique pseudodiaphragm. Hydrotheca distinctly widening distally; rim slightly everted. Adcauline hydrothecal wall free; distinctly larger than abcauline one. Hydrothecal aperture slightly directed downwards. Up to one secondary hydrotheca present. Male gonoteca oval, elongated with distal, shallow groove. Female gonotheca flattened, terebratulid brachiopod-shaped; abcauline wall longer. Aperture at distal part. With acrocyst (one embryo). Cnidome consisting of isorhizas, larger microbasic euryteles, smaller microbasic euryteles and microbasic mastigophores. Description (type material of H. incertus ). Three stem fragments, c. 42, 32 and 30 mm long. 42-mm-long fragment corresponding to a basal stem fragment, strongly polysiphonic, ...