Oswaldella antarctica ( Jäderholm, 1904 )

Peña Cantero, A. L. & Vervoort, W., 2004, Species of Oswaldella Stechow, 1919 (Cnidaria: Hydrozoa: Kirchenpaueriidae) from US Antarctic expeditions, with the description of three new species, Journal of Natural History 38, pp. 805-861 : 812-816

Oswaldella antarctica ( Jäderholm, 1904)

Schizotricha antarctica p.p. Jäderholm, 1904: 12; 1905: 35, pl. 14 figures 6–8.

Not Schizotricha antarctica: Vanhöffen, 1910: 336 , figure 48 (= Oswaldella rigida Peña Cantero, Svoboda and Vervoort, 1997 ).

Oswaldella antarctica: Stechow, 1919: 853 ; 1920: 40 (32); Peña Cantero and Vervoort, 1995: 330–333, figure 1; 1998: 36; Peña Cantero et al., 1997: 344; Peña Cantero and García Carrascosa, 1998: 178; 1999: 214; Peña Cantero and Marques, 1999: 85.

? Polyplumaria antarctica: Jäderholm, 1926: 6 .

Not Polyplumaria antarctica: Billard, 1914: 28–31 , figure 17 (= Oswaldella erratum Peña Cantero and Vervoort, 1997 ).

Not Oswaldella antarctica: Totton, 1930: 209–210 , figure 51 (= Oswaldella terranovae Peña Cantero and Vervoort, 1996 ); Blanco, 1984: 41, pl. 38 figures 86–88 (= Oswaldella blanconae El Beshbeeshy, 1991 ); Broch, 1948: 13–16, figure 4a; Stepan’yants, 1979: 112, pl. 21 figure 5a, b (= Oswaldella stepanjantsae El Beshbeeshy, 1991 ); Naumov and Stepan’yants, 1972: 52, figure 14a, b (= partly Oswaldella stepanjantsae El Beshbeeshy, 1991 , partly another species of Oswaldella ); Peña Cantero, 1991: 168, pls 31, 56, pl. 68 figure a; Peña Cantero and García Carrascosa, 1994: 125–126, figure 8 a–c; 1995: 96–101, figures 43A–E, 44A–F, 64E (= Oswaldella incognita Peña Cantero, Svoboda and Vervoort, 1997 ).

Remarks. Oswaldella antarctica is well characterized by the monosiphonic and unbranched stems, divided into internodes, the presence of two axillary nematophores and one ‘mamelon’ on the cauline apophyses, the much branched hydrocladia, the presence of a much reduced nematotheca on the hydrocladial internodes and the shape of the hydrotheca which is situated on the middle of the hydrocladial internode ( table 1).

Ecology and distribution. Oswaldella antarctica is known from off Seymour Island (Graham Land), where it was collected at 150 m depth ( Jäderholm, 1904; Peña Cantero and Vervoort, 1995).