A monospecific assemblage of a new rhynchonellide brachiopod from the Paleocene of Austria

Alfréd Dulai, Maria Aleksandra Bitner, P. Á L. Müller

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Brachiopods suffered greatly during the end-Cretaceous mass extinction and only a few taxa and localities are known from the Paleocene. Most of the European Paleocene brachiopods are known from chalk facies. A new locality with Paleocene brachiopods was found at Kambühel (Austria), and about 200 specimens have been collected. The lithology of the brachiopod-bearing rock is rather peculiar not only for the Paleocene but also for the Cenozoic as a whole: it is a massive, brownish red limestone. The monospecific rhynchonellide assemblage is definitely autochthonous; practically all the specimens have articulated valves without signs of transportation and/or re-sedimentation. The medium-sized, dorsibiconvex specimens are uniplicate, sometimes slightly asymmetrical. They have conjunct deltidial plates and a small foramen. The numerous (9-19), rounded ribs are generally stronger at the anterior margin. The internal characters display dental plates medially convex in transverse section, broad horizontal hinge plates, no cardinal process and sub-falciform crura. All these suggest that the investigated brachiopods represent a new genus and species, Basiliocostella kambueheli, n. gen. et n. sp., attributable to the family Basiliolidae. The shell ultrastructure is of coarse-fibrous basiliolidine with the secondary layer fibres of a rhomboidal shape, and confirms the previous attribution to the Basiliolidae.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalFossils and Strata
Issue number54
Publication statusPublished - febr. 1 2008


ASJC Scopus subject areas

  • Palaeontology

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