Oswaldella erratum Peña Cantero & 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 : 406-409

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.6107449

persistent identifier

https://treatment.plazi.org/id/03C287C6-280E-7C1E-D4F4-8F942F9E788C

treatment provided by

Plazi

scientific name

Oswaldella erratum Peña Cantero & Vervoort, 1997
status

 

Oswaldella erratum Peña Cantero & Vervoort, 1997 View in CoL

( Figs 4 View FIGURE 4 , 16 View FIGURE 16 D, 17D, 19D)

Material examined. German Antarctic Expedition ANT-XXI/2: Stn PS65 /166-1, Polarstern, 15 December 2003, 70°56.83’–70°56.00’, 10°32.61’– 10°30.53’W (off Cape Norvegia, Weddell Sea), 338– 253 m. Spanish Antarctic Expedition Bentart 95: Stn 24R, Hespérides, 30 January 1995, 63°58.4715’S, 60°51.9882’W (off Trinity Island, Graham Land), 214 m (Department of Zoology, University of Valencia, BENTART 95-24R).

Description. Monosiphonic (occasionally polysiphonic), unbranched stems, up to 130 mm high, usually not divided into internodes. Typically, perisarc strongly developed. Angle between cauline apophyses and stem ca. 70°. Cauline apophyses with two axillary nematophores, each provided with a much-reduced nematotheca ( Fig. 4 View FIGURE 4 B).

Hydrocladia branched, up to third-order hydrocladia reported. First hydrocladial internode bifurcated, with two similar prongs ( Fig. 4 View FIGURE 4 A). Mesial-inferior nematophore on a strongly marked swelling at proximal third of internode ( Fig. 4 View FIGURE 4 D–E); with scale-shaped nematotheca ( Fig. 4 View FIGURE 4 D–F). Hydrotheca elongate, placed on middle of internode ( Fig. 4 View FIGURE 4 A, D–E). Abcauline wall of hydrotheca basally straight, but strongly curving adcaudally at distal part ( Fig. 4 View FIGURE 4 E). Hydrothecal aperture kidney-shaped ( Fig. 4 View FIGURE 4 C), adcaudally directed ( Fig. 4 View FIGURE 4 E).

Gonothecae fusiform. Female gonotheca larger than male one, with subterminal, circular aperture. Male gonotheca with distal, circular aperture ( Fig. 4 View FIGURE 4 G).

Remarks. The most remarkable finding in relation to this species is the presence of much-reduced nematothecae in the axillary nematophores, never described before.

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