DOI

10.17077/etd.a6y7mly2

Document Type

Thesis

Date of Degree

Summer 2017

Degree Name

MS (Master of Science)

Degree In

Geoscience

First Advisor

Tierney-Cramer, Kate

Second Advisor

Foster, Charles

First Committee Member

Day, James

Second Committee Member

Brochu, Christopher

Third Committee Member

Kosloski, Mary

Fourth Committee Member

Witzke, Brian

Abstract

Recent inquiry into the nomenclature of several species within Spinocyrtia has led to questions concerning name applicability and validity, particularly whether Delthyris granulosa and Spinocyrtia (Spirifer) granulosa are synonymous. This study utilized two-dimensional outline landmark analysis, a form of geometric morphometric analysis, to evaluate interspecific variation among these species. I took over a thousand photographs of over a hundred specimens of brachiopods belonging to the family Spinocyrtiidae. Ninety-six specimens originated from the Givetian outcrop belt of New York state, three were from northwestern Ohio, there was single Canadian specimen, and there was a single German specimen. The results from these analyses indicate that the mophospaces of Spinocyrtia (Spirifer) congesta, S. (Spirifer) granulosa, and S?. (Spirifer) marcyi are statistically (p < 0.05) distinct from one another.

Keywords

Brachiopoda, Devonian, Geometric Morphometrics, Landmarks, Principal Component Analysis, Spinocyrtid

Pages

ix, 46 pages

Bibliography

Includes bibliographical references (pages 20-23).

Copyright

Copyright © 2017 Alexander Patrick Layng

Additional Files

MakeFan_Images.zip (28658 kB)
Specimen_labels.zip (173288 kB)
tps_landmark_files.zip (118 kB)
Dorsal.zip (435042 kB)
Stackshot Images Dorsal

Test Images (42-45).zip (186829 kB)
Stackshot Images Test Images

Ventral.zip (614830 kB)
Stackshot Images Ventral

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