Oswaldella vervoorti Pena Cantero & Garcia Carrascosa 1998
- Dataset
- SEM study of species of Oswaldella Stechow, 1919 (Cnidaria, Hydrozoa, Kirchenpaueriidae), with an annotated checklist of the species of the genus
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Cnidaria
- class
- Hydrozoa
- order
- Leptothecata
- family
- Kirchenpaueriidae
- genus
- Oswaldella
- species
- Oswaldella vervoorti
description
Description. Monosiphonic, unbranched stems, up to 95 mm high, divided into internodes. Angle between cauline apophyses and stem ca. 45 °. Cauline apophyses with two axillary nematophores, each emerging through hole in apophysis perisarc, provided with slight abcauline projection of perisarc, and another one emerging through strongly developed ‘ mamelon’, provided with relatively large aperture (Fig. 14 B). Hydrocladia branched (Fig. 14 A), with up to fourth-order hydrocladia. First hydrocladial internode bifurcated, with two similar prongs (Fig. 14 A). Mesial inferior nematophore emerging from marked swelling at proximal third of internode (Fig. 14 C – D); with relatively large, claw-shaped nematotheca (Fig. 14 C – E). Hydrotheca elongate, placed on distal half of internode. Abcauline wall roughly straight; adcauline wall mostly adnate (Fig. 14 D). Hydrothecal aperture perpendicular to long axis of internode, sub-circular, adcauline side more or less straight; rim even (Fig. 14 C – D). Immature gonothecae, inverted cone-shaped (Fig. 14 A, F).
discussion
Remarks. Although only up to second-order hydrocladia were observed in the material examined (Fig. 14 A), up to fourth-order hydrocladia have been described (cf. Peña Cantero & García Carrascosa 1998).
materials_examined
Material examined. United States Antarctic Research Program (USARP): Stn 721 / 1063, Hero, 19 December 1971, 62 ° 19.0 ’ S, 59 ° 11.4 ’ W (Nelson Island, South Shetland Islands), 44 m (USNM 1003380).