Bimeria corynopsis Vanhöffen, 1910

ÁLVARO L. PEÑA CANTERO, 2017, Benthic hydroids (Cnidaria, Hydrozoa) from the Ross Sea (Antarctica) collected by the New Zealand Antarctic expedition BioRoss 2004 with RV Tangaroa, Zootaxa 4293 (1), pp. 1-65 : 9

Bimeria corynopsis Vanhöffen, 1910

( Fig. 2 A–B)

Bimeria corynopsis —Peña Cantero, 2015: 370–373, figs 1A, 2A–B, 3A–B (synonymy).

Material examined. Stn 139, a few polyps, on Staurotheca nonscripta Peña Cantero, Svoboda & Vervoort, 1997 and bryozoans (MNCN 2.03/526); Stn 140, a few stems, with up to three polyps, on Hydrodendron arboreum ( Allman, 1888) and Staurotheca nonscripta (NIWA 117472).

Measurements (in µm). Cnidome: microbasic euryteles (seen discharged) [range 8.5–9.5 x 5.0, mean 9.1±0.3 x 5.0±0.0 (n= 7); ratio, range 1.7–1.9, mean 1.8±0.1 (n=7)], desmonemes [range 5.5– 6 x 3.5].

Remarks. Stems with up to three polyps, pedicels undulated and polyp tentacles with distinct distal knob ( Fig. 2 A).

Ecology and distribution. Shelf species collected at depths from 385 ( Vanhöffen 1910) to 527 m ( Peña Cantero 2014a); present material between 231 and 240 m, epibiotic on Hydrodendron arboreum and Staurotheca nonscripta .

East Antarctic distribution ( Peña Cantero 2014a), hitherto only known from the Davis Sea ( Vanhöffen 1910; Peña Cantero 2014a). Present material, which constitutes the third record for the species and the first one for the Ross Sea, off Moubray Bay, extending considerably its geographic distribution.

Figures

FIGURE 2. Bimeria corynopsis Vanhöffen, 1910: A, polyp with swollen tentacle ends; B, nematocysts (microbasic euryteles and desmonemes). Rhizorhagium antarcticum (Hickson & Gravely, 1907): C, discharged microbasic eurytele. Hydractinia sp.: D, polyp. (A, D from Stn 139; B from Stn 140; C from Stn 130). Scale bar: 200 µm (A, D), 10 µm (B – C).