Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica) Author Soto, Joan J. Author Peña, Álvaro L. text Zootaxa 2019 2019-03-22 4570 1 1 78 journal article 27992 10.11646/zootaxa.4570.1.1 66601a1e-ba16-41b2-b182-0fd80e75ccba 1175-5326 2608527 EF369E98-EBD9-4647-B081-65AD1794A27C Filellum antarcticum ( Hartlaub, 1904 ) ( Fig. 6 c–f) Material examined. ANT XV/3 : 48-5 , numerous hydrothecae, on S. lobata , with coppinia; ANT XVII/3 : 111-9 , several hydrothecae, on S. lobata , with coppinia; ANT XXI/2 : PS65/276 , numerous hydrothecae, on St. vanhoeffeni , with coppinia. FIGURE 6. a–b Acryptolaria frigida : a stem; b hydrotheca; c–f Filellum antarcticum : c hydrotheca; d coppinia; e section of a coppinia showing gonothecae and eggs; f detail of gonothecal aperture. g Filellum cf. magnificum : hydrotheca. h Filellum cf. bouvetensis : hydrotheca. i–j Lafoea dumosa : i stem; j detail of the stem showing hydrothecal arrangement. k Lafoea gaussica : hydrotheca. l-m Abietinella operculata : l stems; m detail of the stem showing hydrothecal arrangement. n Hebella cf. plana : hydrotheca. Remarks. Cnidome comprising large microbasic mastigophores [range 10.0–12.0 x 4.0–4.5 µm, mean 10.9±0.8 x 4.1±0.2 µm (n=11)] and small microbasic euryteles [range 5.5–6.5 x 2.5–3.0 µm, mean 6.1±0.3 x 2.8±0.3 µm (n=18)]. Ecology and distribution. Species previously reported in Antarctic waters at depths from 42 ( Stepanjants 1979 ) to 1658 m (Peña Cantero in press ); present material from 62 to 277 m . Species known from all over Antarctic waters (Peña Cantero et al. 2004) and South Africa ( Millard 1964 , 1975 ).