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 Antarctoscyphus spiralis ( Hickson and Gravely, 1907 ) ( Fig. 3D ) Symplectoscyphus spiralis — Briggs, 1938 : 34 –35. Antarctoscyphus spiralis —Peña Cantero et al. , 2017: 31–34, fig. 13 (synonymy). Material examined. 29EV59 , a stem fragment 70 mm long (IK–2009–0335); 63EV314 , a colony fragment 70 mm long, with gonothecae (IK–2012–10434). Remarks. This is a well-known species, easily recognizable by the presence of three internal cusps situated at the embayments between the cusps of the hydrothecal aperture ( Fig. 3D ). See Peña Cantero et al. (2017) for a recent diagnosis. Ecology and distribution. Our material was collected from depths between 423 and 480 m , and with gonothecae in January. Previously reported by Briggs (1938) , at depths between 99 and 720 m , from Commonwealth Bay. Circum-Antarctic distribution ( Stepanjants 1979 ).