warne-observationson-2004.pdf (1.77 MB)
Observations on Loxocythere (Loxocythere) ouyenensis (Chapman, 1914) (Ostracoda) from the Cenozoic of S.E. Australia with comments on species attributed to Microcytherura Müller, 1894 and Hemiparvocythere Hartmann, 1982 from Australian and New Zealand marine waters
The type material of Loxocythere (Loxocythere) ouyenensis (Chapman, 1914) from mid Cenozoic strata of the Mallee Bore No. 11 in the Murray Basin, S.E. Australia is partially redescribed and refigured. This species belongs to a discrete group of large elongate Cenozoic fossil and living Loxocythere species, the carapaces of which possess sub-rectangular inner margin outlines, and broadly rounded posterior extremities. Some much smaller but otherwise very similarly shaped species, that have previously been placed under the genus Microcytherura (i.e. Microcytherura? peterroyi Yassini and Jones, 1995) or the genus Hemiparvocythere Hartmann, 1982 (i.e. Hemiparvocythere Iagunicola Hartmann, 1982), are also known from marine Cenozoic strata and modern seas of the Australasian region. There is a marked difference in the shape of the inner margin between this group of small Australasian forms and European species of Microcytherura s.s .. The former have broadly rounded posterior inner margins, whilst the latter have acutely rounded posterior inner margins. The latter also usually present posterior extremities located well below mid carapace height. It is here argued that this difference in inner margin shape between smaller Australasian species such as Microcytherura? peterroyi, and European species of Microcytherura s.s ., suggests that there is not a direct phylogenetic relationship between these two species groups.
History
Journal
Proceedings of the Royal Society of VictoriaVolume
116Issue
2Pagination
257 - 264Publisher
Royal Society of VictoriaLocation
Melbourne, Vic.ISSN
0035-9211Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2004, Royal Society of VictoriaUsage metrics
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