Oswaldella rigida Peña Cantero, Svoboda & Vervoort, 1997
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.6107471 |
persistent identifier |
https://treatment.plazi.org/id/03C287C6-2804-7C04-D4F4-8F932D2E7944 |
treatment provided by |
Plazi |
scientific name |
Oswaldella rigida Peña Cantero, Svoboda & Vervoort, 1997 |
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Oswaldella rigida Peña Cantero, Svoboda & Vervoort, 1997 View in CoL
( Figs 11 View FIGURE 11 , 16 View FIGURE 16 K, 18C, 20C)
Material examined. New Zealand Antarctic Expedition TAN0402: Stn 88, Tangaroa , 14 February 2004, 72°05'86''S, 172°55'81''E (Cape Adare, Ross Sea), 515 m.
Description. Monosiphonic, usually unbranched stems, up to 210 mm high, usually divided into internodes. Angle between cauline apophyses and stem 70–90°. Perisarc strongly developed. Cauline apophyses with two axillary nematophores, each emerging through simple perisarc holes ( Fig. 11 View FIGURE 11 B–C).
Hydrocladia typically bifurcated ( Fig. 11 View FIGURE 11 A), but up to third-order branching present. First hydrocladial internode bifurcated, with two similar prongs ( Fig. 11 View FIGURE 11 B). Mesial inferior nematophore emerging from marked swelling at proximal third of internode ( Fig. 11 View FIGURE 11 D); with strongly developed nematotheca ( Fig. 11 View FIGURE 11 D, F). Hydrotheca elongate, roughly placed on middle of internode. Stony appearance. Abcauline wall straight, but convex at basal part. Hydrothecal aperture circular, roughly perpendicular to long axis of internode ( Fig. 11 View FIGURE 11 D–E, G); rim typically uneven, with slight adcauline elevation.
Gonothecae elongated with large subterminal aperture.
Remarks. The most striking feature of O. rigida is the strong stony appearance under SEM.
We have observed two axillary nematophores on every cauline apophysis examined ( Fig. 11 View FIGURE 11 B–C). Nevertheless, Peña Cantero et al. (1997) indicated that apophyses with a single axillary nematophore were also present. In this sense, it is worth mentioning that we have also observed a tendency to fusion of the two axillary nematophores.
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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