Oswaldella shetlandica Stepanjants, 1979

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 : 419

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.6107476

persistent identifier

https://treatment.plazi.org/id/03C287C6-2819-7C04-D4F4-8B7428877C67

treatment provided by

Plazi

scientific name

Oswaldella shetlandica Stepanjants, 1979
status

 

Oswaldella shetlandica Stepanjants, 1979 View in CoL

( Figs 12 View FIGURE 12 , 16 View FIGURE 16 L, 18D, 20E)

Material examined. Spanish Antarctic Expedition Bentart 2006: Stn Low 45, Hespérides, February 2006, 63.43171°S, 62.2116°W (Low Island, Antarctic Peninsula), 86 m (Department of Zoology, University of Valencia, BENTART 2006—LOW 45).

Description. Polysiphonic, unbranched stems, up to 170 mm high, divided into internodes. Angle between cauline apophyses and stem ca. 45°. Cauline apophyses with four nematophores: two axillary ones, each emerging through simple hole in perisarc, and two other nematophores, each emerging through a strongly developed ‘mamelon’ ( Fig. 12 View FIGURE 12 B).

Hydrocladia much branched ( Fig. 12 View FIGURE 12 A), with up to fourth-order hydrocladia. First hydrocladial internode bifurcated, with two similar prongs ( Fig. 12 View FIGURE 12 A). End of distal internodes peak-shaped ( Fig. 12 View FIGURE 12 A, E). Mesial inferior nematophore emerging from very strongly marked swelling at proximal third of internode ( Fig. 12 View FIGURE 12 C–E); without nematotheca ( Fig. 12 View FIGURE 12 C–E). Hydrotheca elongate, placed on middle of internode. Abcauline wall convex at distal part. Free part of adcauline wall much separated from internode ( Fig. 12 View FIGURE 12 D). Mesial superior nematophore arising at axil between internode and free part of adcauline wall ( Fig. 12 View FIGURE 12 D). Hydrothecal aperture kidney-shaped ( Fig. 12 View FIGURE 12 D), adcaudally directed; free part of adcauline wall strongly directed inwards ( Fig. 12 View FIGURE 12 D).

Gonothecae pear-shaped, with distal, large, circular aperture; female gonotheca ( Fig. 12 View FIGURE 12 F) much larger than male one.

Remarks. Cauline apophyses with a single ‘mamelon’ have also been reported (cf. Peña Cantero & Vervoort 2004). The relatively large size of the aperture of the ‘mamelons’ is noteworthy ( Fig. 12 View FIGURE 12 B).

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