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Identification and independence: morphometrics of Cenozoic New Zealand Spissatella and Eucrassatella (Bivalvia, Crassatellidae)

Published online by Cambridge University Press:  10 June 2013

Katie S. Collins ,
James S. Crampton  and
Michael Hannah
Katie S. Collins
Affiliation:
Victoria University of Wellington, Post Office Box 600, Wellington, New Zealand. E-mail: katiesusannacollins@gmail.com
James S. Crampton
Affiliation:
GNS Science, Post Office Box 30368, Lower Hutt, New Zealand, and Victoria University of Wellington, Post Office Box 600, Wellington, New Zealand. E-mail: j.crampton@gns.cri.nz
Michael Hannah
Affiliation:
Victoria University of Wellington, Post Office Box 600, Wellington, New Zealand. E-mail: Michael.Hannah@vuw.ac.nz
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Abstract

Fossil bivalve shells are well-suited for landmark/semilandmark morphometric analysis because they preserve both traces of the internal anatomy and the whole shell outline. Utilizing landmarks and semilandmarks, we have characterized internal and external shape variation in a monophyletic clade of Cenozoic New Zealand and Australian crassatellid bivalves, to test the contiguity in morphospace of species-level taxa and to quantitatively examine the “Concept of Independent Entities” of Yonge (1953). Thirteen species from two genera (Spissatella Finlay 1926 and Eucrassatella Iredale 1924) are investigated. Spissatella n. sp. C is confirmed as forming a contiguous group separate to S. trailli and S. clifdenensis. Shell outline and internal anatomy are found to covary in shape, refuting the “Concept of Independent Entities” in the study group.

Type
Articles
Information
Paleobiology , Volume 39 , Issue 4 , Fall 2013 , pp. 525 - 537
Copyright
Copyright © The Paleontological Society 

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