Halecium secundum 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 secundum; Antarc*; Antarctic; Seymour Island
• Online Access: https://doi.org/10.5281/zenodo.4630899; http://treatment.plazi.org/id/3E6287E02953FF902CA91C593C61FC41

Halecium secundum Jäderholm, 1904 (Fig. 4 D–F) Halecium secundum Jäderholm, 1904: iii–iv; 1905: 11–12, pl. 4 figs 4–7; Redier, 1971: 70; Stepanjants, 1979: 109, pl. 16 fig. 8; Blanco, 1994a: 156; 1994b: 187; Vervoort & Watson, 2003: 86; Peña Cantero, 2004: 769; Peña Cantero et al ., 2013: 747 fig. 6c. Material examined. Syntype, SMNH Type-7948, Schwedischen Antarctic-Expedition 1901–1903 , Stn 5 , 64°20’S 56°38’W (SE of Seymour Island, Graham Region), four fragments up to 7 mm long. Diagnosis. Polysiphonic, irregularly branched stems, up to 25 mm high. Branches originating either from abcauline side of hydrophore of primary hydrotheca or from inside hydrotheca. Usually, with ahydrothecate intermediate internode after apophysis. Hydrothecae alternately arranged in either one or two planes. Hydrotheca at the end of short, adnate hydrophore. Hydrotheca very slightly widening distally; rim not everted. Adcauline hydrothecal wall free or adnate to internode. Hydrothecal aperture slightly directed downwards. No secondary hydrothecae present. Male gonotheca elongated, cylindrical, distally with a wide, shallow furrow, and proximally with a sharp keel. Female gonotheca unknown. Cnidome consisting of microbasic mastigophores? and microbasic euryteles? Description. Material studied consisting of four fragments up to 7 mm long; stems up to 25 mm according to Jäderholm (1904, 1905). Apparently, branching alternate. Longest fragment provided with four side-branches: first one originating from a primary hydrotheca through an apophysis and an intermediate, short, ahydrothecate internode before the first hydrothecate internode; the other three branches arising from the lateral of hydrophores. Seemingly, side-branches resting on large apophyses, frequently followed by an intermediate, short, ahydrothecate internode. Stem and branches divided by alternately arranged nodes into relatively short and wide internodes (Fig. 4 D–F). Hydrothecae alternately arranged, from more or less in one plane to about 90°. Hydrothecae resting ...