Halecium antarcticum Vanhoffen 1910

• Main Author: Watson, Jeanette E.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium antarcticum; Antarc*
• Online Access: https://doi.org/10.5281/zenodo.4630619; http://treatment.plazi.org/id/039D5126FFA7FFBE1B25FC311FDD9522

Halecium antarcticum Vanhöffen, 1910 Figure 2A–C Halecium antarcticum Vanhöffen, 1910: 317, fig. 34.- Billard, 1914: 7, fig. 5.- Totton, 1930: 144, fig. 4.- Broch, 1948, 28: 7.- Naumov and Stepanjants, 1958: 57.- Blanco, 1984: 294, figs 8-13, pls. 4-5. Material examined. NMV F147447, Station 107, two microslides displaying branch fragments and a preserved fertile colony. NMV F147448, Station 107, one microslide displaying branch fragments. NMV F147449, Station 1785, one microslide displaying two small branch fragments. Description. Fertile colony originally at least 40 mm high. Hydrorhiza reptant on sponge; stolons tubular, rugose, loosely adherent to substrate. Shorter stems monosiphonic; stems beginning with several broad basal annulations above junction with hydrorhiza; taller stem branched, lightly fascicled with several wide, tangled tubes running almost to tip of colony and along primary branches. Branching irregular and disorderly, branches bent outwards atvarious angles from main stem, ultimatebranches short, straight, monosiphonic. Monosiphonic branch internodes fairly wide, cylindrical, walls smooth, nodes deep, oblique, sloping away from hydrophore, a tumescence and often one or several deep corrugations in perisarc above node. Primary hydrophores alternate on stem, one distal on each internode, cylindrical, length variable but typically moderately long, abcauline wall curving smoothly away from internode, adcauline wall more or less straight. Hydrotheca bowl-shaped, expanding from diaphragm to margin, rim everted and a little outrolled. Diaphragm fairly distinct, a few desmocytes above. Hydrophores typically regenerated in linear series of up to five; successive hydrophores variable in length, each arising from diaphragm of preceding hydrotheca; hydrophores with broad basal kinks and up to 10 close corrugations. Gonothecae probably male, inserted in hydrophore on distal monosiphonic branches; shape variable from flattened clavate to ovoid with a low apical dome with flattened top. Perisarc of stem, ...