Oswaldella incognita Peña Cantero, Svoboda & Vervoort, 1997

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 : 412

Oswaldella incognita Peña Cantero, Svoboda & Vervoort, 1997

( Figs 8 , 16 H, 17H, 19H)

Material examined. New Zealand Antarctic Expedition TAN0402: Stn 241, Tangaroa , 4 March 2004, 66°54'77''– 66°55'01''S, 163°13'65''– 163°13'69''E (off Buckle Island, Balleny Islands), 70– 78 m.

Description. Monosiphonic, unbranched stems, up to 130 mm high, divided into internodes. Angle between cauline apophyses and stem ca. 45°. Cauline apophyses with two axillary nematophores, each emerging through simple perisarc hole ( Fig. 8 B–C).

Hydrocladia bifurcated ( Fig. 8 A). First hydrocladial internode with two similar prongs ( Fig. 8 A). Mesial inferior nematophore emerging from strongly marked swelling at proximal third of internode ( Fig. 8 D–E); with large, claw-shaped nematoteca ( Fig. 8 D–F). Hydrotheca elongate, situated on middle or distal half of internode ( Fig. 8 D–E). Abcauline wall straight or slightly convex ( Fig. 8 D). Hydrothecal aperture circular, roughly perpendicular to long axis of internode ( Fig. 8 A, D).

Gonothecae fusiform, with subterminal aperture.

Figures

FIGURE 8. Oswaldella incognita Peña Cantero, Svoboda & Vervoort, 1997. A, hydrocladial branching and disposition of hydrothecae; B – C, cauline apophyses showing axillary nematophores; D – E, unforked hydrocladial internodes (D lateral view, E frontal view); F, detail of mesial inferior nematotheca. Scale bar: 200 µm (A), 100 µm (C – E) and 20 µm (B – F).

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).