Oswaldella vervoorti Peña Cantero & García Carrascosa, 1998

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 : 422

publication ID

https://doi.org/ 10.11646/zootaxa.4052.4.1

publication LSID

lsid:zoobank.org:pub:47EF6E9D-9064-4899-B3DD-276FF7C969EB

DOI

https://doi.org/10.5281/zenodo.6107484

persistent identifier

https://treatment.plazi.org/id/03C287C6-281E-7C03-D4F4-8B3628CD7BFA

treatment provided by

Plazi

scientific name

Oswaldella vervoorti Peña Cantero & García Carrascosa, 1998
status

 

Oswaldella vervoorti Peña Cantero & García Carrascosa, 1998 View in CoL

( Figs 14 View FIGURE 14 , 16 View FIGURE 16 O, 18G, 20G)

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).

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 View FIGURE 14 B).

Hydrocladia branched ( Fig. 14 View FIGURE 14 A), with up to fourth-order hydrocladia. First hydrocladial internode bifurcated, with two similar prongs ( Fig. 14 View FIGURE 14 A). Mesial inferior nematophore emerging from marked swelling at proximal third of internode ( Fig. 14 View FIGURE 14 C–D); with relatively large, claw-shaped nematotheca ( Fig. 14 View FIGURE 14 C–E). Hydrotheca elongate, placed on distal half of internode. Abcauline wall roughly straight; adcauline wall mostly adnate ( Fig. 14 View FIGURE 14 D). Hydrothecal aperture perpendicular to long axis of internode, sub-circular, adcauline side more or less straight; rim even ( Fig. 14 View FIGURE 14 C–D).

Immature gonothecae, inverted cone-shaped ( Fig. 14 View FIGURE 14 A, F).

Remarks. Although only up to second-order hydrocladia were observed in the material examined ( Fig. 14 View FIGURE 14 A), up to fourth-order hydrocladia have been described (cf. Peña Cantero & García Carrascosa 1998).

USNM

Smithsonian Institution, National Museum of Natural History

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