Filellum antarcticum ( Hartlaub, 1904 )

Soto, Joan J. & Peña, Álvaro L., 2019, Benthic hydroids (Cnidaria, Hydrozoa) from the Weddell Sea (Antarctica), Zootaxa 4570 (1), pp. 1-78 : 20-22

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.

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).

Figures

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.