Halecium pallens Jaderholm 1904

• 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 pallens; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.4630891; http://treatment.plazi.org/id/3E6287E0295AFF972CA91A373EAEF910

Halecium pallens Jäderholm, 1904 (Fig. 3 E–K) Halecium pallens Jäderholm, 1904: iv; 1905: 4, 12–13, 38, pl. 5 figs 1–3; Blanco, 1994a: 156; 1994b: 187; Vervoort & Watson, 2003: 86. Not Halecium pallens — Broch, 1948: 4, 7–8, fig. 1; Stepanjants, 1979: 105, pl. 20 fig. 2; Peña Cantero, 2004: 769; 2006: 935, fig. 3B; 2008: 455, fig. 1h, i; 2010: 766, fig.4; Peña Cantero & Vervoort, 2009: 85, fig. 1g, h (= H. banzare Watson, 2008). Not Halecium pallens — Galea & Schories, 2012a: 36, pl. 3A, B, fig. 3G–M. (=? H. banzare Watson, 2008). Material examined. Syntype, SMNH Type-7947 (old no. 436), Schwedischen Antarctic-Expedition 1901–1903 , Stn 34 , 05–06–1902, 54°11’S 36°18’W (mouth of Cumberland Bay, South Georgia), 252–310 m, one stem c. 130 mm high. Diagnosis. Polysiphonic stems, at least 130 mm high. Branching regular, stem giving rise alternately, likely every third hydrotheca, to paired branches forming two distinct, longitudinal series, approximately arranged in one plane. Branches originating from hydrophore of primary hydrotheca. Hydrothecae alternately arranged in one plane. Hydrotheca at the end of long, free hydrophore lacking pseudodiaphragm, but with strong adcauline perisarc development. Hydrothecal diameter slightly increasing distally. Very slightly everted rim. Up to third-order hydrothecae present. Female gonotheca flattened, pear-shaped, with short distal neck. With acrocyst (up to eight eggs). Cnidome consisting of microbasic mastigophores? and microbasic euryteles? Description. Completely polysiphonic stem, at least 130 mm high (probably a little higher since it is distally broken). Diameter slightly decreasing distally (c. 2 mm at base). Hydrorhiza much developed, rhizoidal, composed of numerous thin stolons. Stem giving rise to side-branches, alternately arranged in approximately one plane and resting more or less perpendicular to it. Side-branches polysiphonic in part of their extension. Some much developed, reaching up to 38 mm long, and strongly polysiphonic. Side-branches paired ...