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A Phylogenetic and Paleobiogeographic Analysis of the Ordovician Brachiopod Eochonetes

Bauer, Jennifer E.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1397486053

Abstract Details

2014, Master of Science (MS), Ohio University, Geological Sciences (Arts and Sciences).
Systematic revision of the Late Ordovician brachiopod genus Eochonetes was conducted utilizing multivariate analyses and a species-level phylogenetic analysis. Thaerodonta has been previously synonymized with Eochonetes; multivariate and phylogenetic analyses support the synonymy of the two genera. The multivariate analyses allowed delineation of species in morphospace and phylogenetic analysis was used to establish evolutionary relationships among species. Three species which were previously in open nomenclature were described and recognized as valid, these include: Eochonetes maearum, E. minerva, and E. voldemortus. The resulting phylogenetic hypothesis was then utilized to reconstruct biogeographic patterns and speciation mode at cladogenetic events within the genus. Phylogenetic biogeographic analysis of Eochonetes and additional Ordovician brachiopod genera was conducted to uncover large-scale geologic drivers of faunal diversification. Area cladograms indicate oceanographic patterns were the main geologic driver of biogeographic patterns within the focal taxa. Furthermore, the Taconic tectophase contributed to the separation of the Appalachian and Central Basins as well as the two Midcontinent Basins. Four migration pathways into the Cincinnati Basin were recognized, further supporting the multidirectional pathway hypothesis for the Richmondian Invasion.
Alycia Stigall (Advisor)
Daniel Hembree (Committee Member)
Gregory Nadon (Committee Member)
154 p.
Geology; Paleontology
Phylogenetics; multivariate analysis; phylogenetic biogeography; brachiopod systematics; Late Ordovician; sowerbyellid; Richmondian Invasion

Recommended Citations

Citations

  • Bauer, J. E. (2014). A Phylogenetic and Paleobiogeographic Analysis of the Ordovician Brachiopod Eochonetes [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1397486053

    APA Style (7th edition)

  • Bauer, Jennifer. A Phylogenetic and Paleobiogeographic Analysis of the Ordovician Brachiopod Eochonetes. 2014. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1397486053.

    MLA Style (8th edition)

  • Bauer, Jennifer. "A Phylogenetic and Paleobiogeographic Analysis of the Ordovician Brachiopod Eochonetes." Master's thesis, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1397486053

    Chicago Manual of Style (17th edition)

ohiou1397486053
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© 2014, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.