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Shell structure and its bearing on the phylogeny of Late Ordovician–Early Silurian strophomenoid brachiopods from Anticosti Island, Québec

Published online by Cambridge University Press:  14 July 2015

Keith Dewing
Keith Dewing*
Affiliation:
Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7,
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Abstract

Four shell types are recognized from strophomenide brachiopods from Anticosti Island based on their fibrous or laminar character and on the type of taleolae. The shell types consistently co-vary with the types of cardinal process and style of socket plates. Treating shell structure as a conservative, non-reversing character implies that there are four groups of strophomenide brachiopod. The laminar-shell strophomenoids probably originated two separate times; one origination giving rise to two groups within the Strophomenida and one origination producing the Orthotetida. This matches the Treatise classification with only minor variation. The fourth group, that with fibrous shell and trilobed cardinal process and which includes the Plectambonitoidea, does not clearly fit into the Strophomenata and may be more closely related to the Clitambonitoidea. A limited cladistic analysis supports the idea that shell structure should be an important factor in establishing evolutionary kinship and points to ways of optimizing the Treatise classification.

Type
Research Article
Information
Journal of Paleontology , Volume 78 , Issue 2 , March 2004 , pp. 275 - 286
Copyright
Copyright © The Paleontological Society 

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