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- Title
The first thecideide brachiopod from the Jurassic of North America.
- Authors
Baker, Peter G.; Wilson, Mark A.
- Abstract
Restudy of a hardground fauna from the Middle Jurassic of south-western Utah revealed the presence of thecideoid brachiopods. The absence of separated dorsal valves and the effects of abrasion and diagenesis hampered the description of the specimens. However, serial sectioning of complete shells revealed a thecidellinid which in its morphology and shell microstructure resembled<E1>Rioultina</E1>Pajaud from the Middle Jurassic of Europe. Important morphological differences clearly separate the new specimens from<E1>Rioultina</E1>and they are assigned to<E1>Stentorina sagittata</E1>gen. et sp. nov. However, the close approximation of certain shell microstructural features does suggest a phylogenetic link between the two genera.<E1>S. sagittata</E1>is also compared with the only other known American Jurassic species,<E1>Ancorellina ageri</E1>Manceñido and Damborenea from the Lower Jurassic of Argentina. Differences in morphological characters currently of family rank preclude the possibility of<E1>Stentorina</E1>being descended from<E1>Ancorellina</E1>stock. It is considered, therefore, that dispersal from Tethyan thecideoid populations to America occurred several times.
- Subjects
FOSSIL brachiopoda; FOSSIL invertebrates
- Publication
Palaeontology, 1999, Vol 42, Issue 5, p887
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/1475-4983.00100