Oswaldella elongata Peña Cantero, García Carrascosa & Vervoort, 1995

Molinero, A. González & Peña Cantero, A. L., 2015, SEM study of species of Oswaldella Stechow, 1919 (Cnidaria, Hydrozoa, Kirchenpaueriidae), with an annotated checklist of the species of the genus, Zootaxa 4052 (4), pp. 401-441 : 406

Oswaldella elongata Peña Cantero, García Carrascosa & Vervoort, 1995

( Figs 3 , 16 C, 17C, 19C)

Material examined. Spanish Antarctic Expedition Antártida 8611: Stn 161, 14 December 1986, 54°53.80'– 54°54.60'S, 34°49.60'– 34°47.70'W ( South Georgia, Clerke Rocks), 150–250 m (Department of Zoology, University of Valencia, ANT 161); Stn 182, 18 December 1986, 54°33.60’– 54°33.40’S, 35°48.20’– 35° 44.40’W ( South Georgia), 86–176 m (Department of Zoology, University of Valencia, Coel. n° 3/ANT 182).

Description. Monosiphonic, unbranched stems, up to 210 mm high, divided into internodes. Angle between cauline apophyses and stem ca. 45°. Cauline apophyses with four nematophores: two axillary ones, each emerging through slot-shaped hole in the perisarc, and other two nematophores, each emerging through “mamelon” ( Fig. 3 B–C).

Hydrocladia bifurcated ( Fig. 3 A). First hydrocladial internode bifurcated, with two similar prongs ( Fig. 3 A). Mesial inferior nematophore emerging from strongly marked swelling at proximal third of internode ( Fig. 3 D–E); deprived of nematotheca ( Fig. 3 D–E). Hydrotheca elongate, tubular, placed on middle of internode ( Fig. 3 A, D–E). Adcauline wall mostly adnate ( Fig. 3 D–E). Abcauline hydrothecal wall slightly convex. Hydrothecal aperture circular, even and adcaudally directed ( Fig. 3 E).

Gonothecae unknown.

Figures

FIGURE 3. Oswaldella elongata Peña Cantero, García Carrascosa & Vervoort, 1995. A, hydrocladial branching and disposition of hydrothecae; B, cauline apophysis with axillary nematophores and ‘ mamelons’; C, detail of cauline axillary nematophores; D – E, unforked hydrocladial internodes (D frontal view, E lateral view). Scale bar: 400 µm (A), 100 µm (D – E) and 20 µm (B – C).

FIGURE 16. Detail of the area from which mesial nematophore emerges. A, Oswaldella bifurca; B, Oswaldella delicata; C, Oswaldella elongata; D, Oswaldella erratum; E, Oswaldella frigida; F, Oswaldella garciacarrascosai; G, Oswaldella grandis; H, Oswaldella incognita; I, Oswaldella laertesi; J, Oswaldella niobae; K, Oswaldella rigida; L, Oswaldella shetlandica; M, Oswaldella stepanjantsae; N, Oswaldella vervoorti; O, Oswaldella sp. Scale bar: 20 µm (A – O).