Symplectoscyphus liouvillei ( Billard, 1914 )

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 : 44

Symplectoscyphus liouvillei ( Billard, 1914)

( Fig. 12 G)

Symplectoscyphus liouvillei— Peña Cantero, 2010a: 38 (synonymy); 2013: 134, fig. 4G, H.

Material examined. Stn 150, stem 170 mm high, with gonothecae (NIWA 117579).

Measurements (in µm). Hydrothecae: length abcauline wall 400–450, length free part of adcauline wall 220–250, length adnate part of adcauline wall 300–350, length adcauline wall 550–570, diameter at aperture 200–220, diameter at diaphragm 170–200, maximum diameter 230–250. Gonothecae (incomplete): height up to 2200, maximum diameter 425–450.

Ecology and distribution. Shelf species ( Peña Cantero 2010a), collected at depths from 65 ( Peña Cantero 2008) to 443 m (Peña Cantero 2006); present material at a depth of 461–480 m, with gonothecae in February.

Hitherto considered to have a West Antarctic-Patagonian distribution ( Peña Cantero et al. 2002). Recently reported off Low Island (Peña Cantero 2013). See Peña Cantero (2010a) for previous records. Present material is the first record from the Ross Sea and East Antarctica , collected off Moubray Bay, therefore the species has an Antarctic-Patagonian distribution.

Figures

FIGURE 12. Antarctoscyphus admirabilis Peña Cantero, Svoboda & Vervoort, 1999: A, branch internode with hydrotheca. Symplectoscyphus aggregatus (Jäderholm, 1917): B, fragment of branch with hydrothecal arrangement and shape. Symplectoscyphus anae Peña Cantero, Svoboda & Vervoort, 2002: C, internode with hydrotheca. Symplectoscyphus densus sp. nov.: D – E, fragment of branch with hydrothecal arrangement and shape; Symplectoscyphus exochus Blanco, 1982: F, internode with hydrotheca. Symplectoscyphus liouvillei (Billard, 1914): G, internode with hydrotheca. Symplectoscyphus vanhoeffeni Totton, 1930: H, internode with hydrotheca. Symplectoscyphus weddelli Peña Cantero, Svoboda & Vervoort, 2002: I, internode with hydrotheca. Symplectoscyphus sp. 1: J, internode with hydrotheca. Symplectoscyphus sp. 2: K, internode with hydrotheca. (A from Stn 17; B from Stn 112; C from Stn 126; D from Stn 7 (holotype); E from Stn 97 (paratype); F from Stn 67; G from Stn 150; H from Stn 130; I, from Stn 53; J from Stn 7; K from Stn 25). Scale bar: 250 µm.