Benthic hydroids (Cnidaria, Hydrozoa) from the Ross Sea (Antarctica) collected by the New Zealand Antarctic expedition BioRoss 2004 with RV Tangaroa Author ÁLVARO L. PEÑA CANTERO text Zootaxa 2017 2017-07-14 4293 1 1 65 journal article 32747 10.11646/zootaxa.4293.1.1 dc2674e2-e260-4b6e-ad3a-731d610bccc5 1175-5326 828475 6FF96B5C-1F80-47ED-9962-19603DCBF550 Eudendrium scotti Puce, Cerrano & Bavestrello, 2002 Eudendrium scotti Puce et al. , 2002 : 370 , fig. 3C, D, fig. 4, fig. 5A, B; Peña Cantero, 2008 : 452 ; 2009: 1745; Peña Cantero & Vervoort, 2009 : 84 ; Peña Cantero et al. , 2013: 736–737, fig. 3f. Material examined. Stn 21, colony with several monosiphonic stems, a few mm high, with a few polyps (NIWA 117479); Stn 148, a few solitary polyps on Staurotheca nonscripta (MNCN 2.03/530). Description. Polyps 300–450 µm high, with ca. 16 tentacles, and a relatively large basal groove. Cnidome composed of large macrobasic euryteles (21–24.8 x 8–10 µm), apparently only on hypostome, and small microbasic euryteles (7–8.5 x 3.5–4 µm). Ecology and distribution. Shelf species found at depths between 10 ( Puce et al. 2002 ) and 135 m ( Peña Cantero & Vervoort 2009 ); present material between 168 and 397 m , epibiotic on Staurotheca nonscripta . Species found epilithic on pebbles (Peña Cantero 2009) and epibiotic on algae (Peña Cantero et al. 2013), hydroids and bryozoans (cf. Peña Cantero 2008 ; Peña Cantero & Vervoort 2009 ; Peña Cantero et al. 2013). Basibiont for other hydroids ( Peña Cantero & Vervoort 2009 ). Gonophores in December (Peña Cantero et al. 2013). Circum-Antarctic distribution (Peña Cantero 2009), known from Tethys Bay in the Ross Sea ( Puce et al. 2002 ; Peña Cantero et al. 2013) and the Balleny Islands (Peña Cantero 2009), in East Antarctica , and off Livingston Island ( Peña Cantero 2008 ), Bransfield Strait and off Low Island ( Peña Cantero & Vervoort 2009 ), in West Antarctica . Present material collected off Possession Islands and Moubray Bay .