Oswaldella shetlandica Stepanjants, 1979
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 |
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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).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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