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Ordovician–Silurian Chileida—First Post-Cambrian Records of an Enigmatic Group of Brachiopoda

Published online by Cambridge University Press:  15 October 2015

Lars E. Holmer ,
Leonid Popov  and
Michael G. Bassett
Lars E. Holmer
Affiliation:
Department of Earth Sciences, Palaeobiology, Uppsala University, SE-752 36 Uppsala, Sweden,
Leonid Popov
Affiliation:
Department of Geology, National Museum of Wales, Cardiff CF10 3NP, UK, ;
Michael G. Bassett
Affiliation:
Department of Geology, National Museum of Wales, Cardiff CF10 3NP, UK, ;
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Abstract

Brachiopods of the order Chileida have been recorded previously only from rocks of early to mid-Cambrian age (Botomian–Amgaian). They are typified by having a calcareous strophic shell with a delthyrium and colleplax, and these characters are shown to be present in species of the two new genera Tolen and Trifissura, from the Late Ordovician of Kazakhstan and the Silurian of Sweden and Britain, respectively. In specimens of Trifissura, the triangular colleplax is phosphatized secondarily by bacterial activity. It is suggested that the phosphatized colleplax represents an organic pad and that served as the original attachment structure of Trifissura by encrustation. Tolen and Trifissura represent the first post-Cambrian record of chileides from the Ordovician and Silurian; the new family Trifissuridae forms the first phylogenetic link between Cambrian chileides and Carboniferous–Permian isogrammides.

Type
Research Article
Information
Journal of Paleontology , Volume 88 , Issue 3 , May 2014 , pp. 488 - 496
Copyright
Copyright © The Paleontological Society 

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