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A combined morphometric and phylogenetic revision of the Late Ordovician brachiopod genera Eochonetes and Thaerodonta

Published online by Cambridge University Press:  14 September 2016

Jennifer E. Bauer  and
Alycia L. Stigall
Jennifer E. Bauer
Affiliation:
Department of Earth and Planetary Sciences, 1412 Circle Drive, 306 EPS, University of Tennessee, Knoxville, Tennessee, 37996-1410, USA 〈jbauer5@vols.utk.edu〉
Alycia L. Stigall
Affiliation:
Department of Geological Sciences and Ohio Center for Ecology and Evolutionary Studies, 316 Clippinger Laboratories, Ohio University, Athens, Ohio, 45701-2979, USA 〈stigall@ohio.edu〉
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Abstract

Systematic revision of the Late Ordovician brachiopod genera Eochonetes Reed, 1917 and Thaerodonta Wang, 1949 was conducted utilizing specimen-based morphometric and species-level phylogenetic analyses. Previous studies had recognized Thaerodonta and Eochonetes as either distinct taxonomic entities or synonyms. New multivariate and phylogenetic analyses confirm the synonymy of Thaerodonta with Eochonetes and provide a framework to assess evolutionary and ecological patterns within the clade. Multivariate analyses were employed to delineate species in morphospace and provided information on potential species relationships. Phylogenetic analysis was used to produce an evolutionary framework for taxonomic revision and identify character evolution within the clade. Most species previously assigned to Thaerodonta are transferred to Eochonetes, and three others are excluded from Eochonetes and provisionally referred to other sowerbyellid genera. Three new species (Eochonetes maearum new species, E. voldemortus new species, E. minerva new species) are described, one species (Leptaena saxea Sardeson, 1892) is synonymized with E. recedens Sardeson, 1892, and one subspecies (Thaerodonta mucronata scabra Howe, 1965) is rejected. This study demonstrates that a combination of complementary approaches and data types has the potential to advance interpretations beyond analyses confined to single analytical tools. Specifically, multivariate analyses provide constraints on species boundaries, whereas species-level phylogenetic analyses provide frameworks to examine morphological, ecological, and biogeographic evolution within a clade.

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Articles
Information
Journal of Paleontology , Volume 90 , Issue 5 , September 2016 , pp. 888 - 909
Copyright
Copyright © 2016, The Paleontological Society 

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