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The genus Glyptospira (Gastropoda: Trochacea) from the Permian of the southwestern United States

Published online by Cambridge University Press:  14 July 2015

Douglas H. Erwin
Douglas H. Erwin*
Affiliation:
Department of Geological Sciences, Michigan State University, East Lansing 48824
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Abstract

Glyptospira is a small, highly ornamented, turriteliform gastropod found in the Lower Permian of the southwestern United States. Two species, Glyptospira cristulata Chronic and G. arelela Plas, have been previously described from the Kaibab Formation, Arizona, and the Bird Spring Group, Arrow Canyon Range, Nevada, respectively. The genus is most diverse in the Wolfcampian Hueco Formation of West Texas and southern New Mexico and the Colina Limestone of southeastern Arizona. This contribution describes four new species of Glyptospira from the southwestern United States: two bicarinate forms, G. huecoensis and G. turrita, and two tricarinate forms, G. tricostata and G. cingulata.

A phylogenetic analysis of all known species of Glyptospira was performed using qualitative characters for which transformation series could be established and two quantitative characters for which transformation series could not be established. The phylogenetic results provided the best available hypothesis of the evolutionary history of the genus.

Type
Research Article
Information
Journal of Paleontology , Volume 62 , Issue 6 , November 1988 , pp. 868 - 879
Copyright
Copyright © The Paleontological Society 

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