Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica) Author Peña Cantero, Álvaro L. Author Marzal, Marina Fresneda text Zootaxa 2018 2018-06-26 4441 1 121 136 journal article 29821 10.11646/zootaxa.4441.1.7 0535eaeb-2e3b-4b6d-9ced-58a61fd02e03 1175-5326 1301927 2D48BC12-329C-4476-BF43-4648B4807E3B Staurotheca pachyclada ( Jäderholm, 1904 ) ( Fig. 3C ) Staurotheca pachyclada —Peña Cantero & Vervoort, 2003 : 2698 –2702, figs 14–15 (synonymy). Material examined. 29EV55 , a stem 300 mm high (IK–2009–0370). Description. Stem erect, polysiphonic, 300 mm high, with some perisarc constrictions. Branching only present in upper half of stem, alternate, almost in one plane. Branches up to third order present, narrowed basally. Hydrothecae present over entire colony, but only visible in monosiphonic parts. Hydrothecae arranged in verticils of three hydrothecae, forming siX longitudinal rows. Hydrotheca cylindrical ( Fig. 3C ), immersed into branch for two-thirds of its volume. Hydrothecal aperture circular, forming an acute angle with long aXis of stem. Ecology and distribution. Our material was collected at depths between 471 and 499 m in George V Basin. Circum-Antarctic distribution (Peña Cantero & Vervoort 2003 ).