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An assessment of morphological fidelity in the sub-fossil record of a terebratulide brachiopod

Richard A. Krause
An assessment of morphological fidelity in the sub-fossil record of a terebratulide brachiopod (in Friday Harbor course on taphonomy, Michal Kowalewski (editor) and Michael LaBarbera (editor))
Palaios (October 2004) 19 (5): 460-476

Abstract

The process of time-averaging can have deleterious effects on the recognition of morphological variability in the fossil record. To explore this issue, a geometric morphometric study was conducted on a life and death assemblage of the terebratulide brachiopod Terebratalia transversa. The results from several geometric morphometric techniques (including Procrustes analysis and thin-plate spline) confirm a high degree of morphological variability with little change in mean shape between the living and sub-fossil assemblages. Additionally, there is no evidence of distinct morphogroups in either assemblage, as postulated for the species in previous studies. These trends persist at all depths and size classes. The similar range of morphological variability at each site suggests a common causal factor such as a similar array of microenvironments available at all depths. One implication of this consistency in morphological variability between the living and sub-fossil assemblages is that the variability of a fossil assemblage of this species could be used to estimate single-generation variability during the time-averaged interval. Furthermore, the potential for recognizing the full range of shape variability in the sub-fossil record of a highly variable species is encouraging for the pursuit of species recognition in the fossil record. Very good fidelity of the sub-fossil assemblage with respect to morphological variability is documented here for the first time in brachiopods, and agrees well with the findings of similar studies of other taxa.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 19
Serial Issue: 5
Title: An assessment of morphological fidelity in the sub-fossil record of a terebratulide brachiopod
Title: Friday Harbor course on taphonomy
Author(s): Krause, Richard A., Jr.
Author(s): Kowalewski, Michaleditor
Author(s): LaBarbera, Michaeleditor
Affiliation: Virginia Polytechnic Institute and State University, Department of Geosciences, Blacksburg, VA, United States
Affiliation: Virginia Polytechnic Institute and State University, Department of Geosciences, Blacksburg, VA, United States
Pages: 460-476
Published: 200410
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 46
Accession Number: 2005-049665
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, sketch maps
N48°30'00" - N48°30'00", W123°00'00" - W123°00'00"
Secondary Affiliation: University of Chicago, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 200518
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