Halecium exaggeratum Pena Cantero, Boero & Piraino 2013

• 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 exaggeratum; Antarc*; Antarctique*; Bellingshausen Sea
• Online Access: https://doi.org/10.5281/zenodo.4630879; http://treatment.plazi.org/id/3E6287E02941FF822CA91AD93B2DFC6B

Halecium exaggeratum Peña Cantero, Boero & Piraino, 2013 (Fig. 5 K) Halecium exaggeratum Peña Cantero, Boero & Piraino, 2013: 743 –745, fig. 6d, e. Halecium sp.1 Peña Cantero, 2008: 455 –456, fig. 1J. Halecium sp. Peña Cantero & Vervoort, 2009: 85, fig. 1I. Halecium delicatulum — Vervoort, 1972b: 341 –343, Fig. 2 a. Halecium antarcticum — Blanco, 1984: 7 –10, pl. 4 figs 8–11, pl. 5 figs 12–13 (in part).? Halecium tenellum — Hartlaub, 1904: 13 –14, pl. 1 fig. 5. ? Halecium delicatulum —Blanco & Bellusci de Miralles, 1972: 7 –10, pl. 1 figs 3–5. Material examined. Halecium tenellum by Hartlaub (1904). RBINS Code 563502, INV 40984, Expédition antarctique Belge S. Y. Belgica 1897–1899 , Stn 243 , 27 April 1898, 70°48’S, 91°54’W (Bellingshausen Sea), 350 m, one stem c. 8 mm high, on tube of polychaete. Diagnosis. Monosiphonic, scarcely branched, slightly geniculate stems, up to 15 mm high. Hydrothecae alternately arranged in one plane. Stem giving rise either to paired or single branches originating from hydrophore of primary hydrothecae. Hydrotheca at the end of extremely long, free hydrophore. Hydrothecal diameter widening distally; rim everted. A secondary hydrotheca present. Gonothecae flattened, triangular, narrowing at base and opening along an irregular slit at apex. Cnidome consisting of microbasic mastigophores? and microbasic euryteles? Description ( H. tenellum by Hartlaub). Stem c. 8 mm high, unbranched, and provided with nine hydrothecae. Internodes relatively long and slightly arranged in a zigzag pattern (Fig. 5 K). Hydrothecae placed at the end of long free hydrophores (Fig. 5 K); ratio between adcauline length of hydrophore and diameter at diaphragm c. 1.7. Hydrophores straight, regularly diverging from internode. Hydrothecae considerably surpassing distal node of internode (Fig. 5 K). Hydrotheca low, distinctly widening distally, more at adcauline side (Fig. 5 K). Rim everted. Hydrothecal height slightly smaller at abcauline side. No pseudodiaphragm. Three hydrothecae with one ...