Abstract
The ostracod assemblages from the Newmarracarra Limestone Formation (Early Bajocian, Western Australia) are highly unusual in being formed exclusively by members of the superfamily Cytheroidea. They are also apparently composed dominantly of endemic taxa, with three new genera defined here (Bringocythere, Fistulosacythere, Gondwanacythere) and only three other genera known from elsewhere in the southern Tethyan area (Amicytheridea Bate 1975,Mandawacythere Bate 1975,Paradoxorhyncha Chapman 1904). Eight species represented by very limited material are tentatively compared with Northern Hemisphere genera but their real affinities are uncertain. The assemblages have little in common with the few records of Southern Hemisphere Middle Jurassic material described from Argentina and elsewhere.
Kurzfassung
Die Ostracoden-Vergesellschaftungen aus der Newmarracarra Limestone-Formation (unteres Bajocium; Western Australia) sind höchst ungewöhnlich in ihrer Zusammensetzung, weil darin ausschließlich Taxa der Über-Familie Cytheroidea enthalten sind. Es handelt sich dabei vorwiegend um endemische Taxa, von denen drei neue Gattungen bestimmt werden (Bringocythere, Fistulosacythere, Gondwanacythere); lediglich drei andere Gattungen sind auch aus anderen Tethys-Gebieten bekannt (Amicytheridea Bate 1975,Mandawacythere Bate 1975,Paradoxorhyncha Chapman 1904). Acht Arten sind sehr spärlich belegt und werden deshalb nur andeutungsweise auf Taxa aus der Nord-Hemisphäre bezogen, wobei ihre Zuordnung jedoch unsicher ist. Die Vergesellschaftungen haben wenig gemeinsam mit mitteljurassischem Material, das in beschränktem Maße von Argentinien und anderswo beschrieben wurde.
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Lord, A.R., Malz, H., Whittaker, J.E. et al. Bajocian Ostracoda of Western Australia and their faunal affinities. Senckenbergiana Lethaea 86, 191–227 (2006). https://doi.org/10.1007/BF03043489
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DOI: https://doi.org/10.1007/BF03043489