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Dutrochus, a new microdomatid (Gastropoda) genus from the Middle Devonian (Eifelian) of west-central Alaska

Published online by Cambridge University Press:  20 May 2016

Robert B. Blodgett
Robert B. Blodgett*
Affiliation:
U.S. Geological Survey, Branch of Paleontology and Stratigraphy, National Center / MS 970, Reston, Virginia 22092
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Abstract

A new gastropod genus, Dutrochus, is established for members of the family Microdomatidae that are characterized by a reticulate ornament of spiral cords and intersecting, finer collabral threads, with all but one spiral cord being of nearly equal strength, and the single remaining cord being of stronger (nearly twice the order) magnitude and being situated at the periphery. It is represented by the type and only known species, Dutrochus alaskensis n. gen. and sp., from the upper part (lower Middle Devonian; lower Eifelian) of the Lower? and Middle Devonian Cheeneetnuk Limestone, McGrath A-5 quadrangle, west-central Alaska. The genus is very close and nearly homeomorphic to the Permian microdomatid genus Glyptospira, but differs from the latter in possessing an extremely strong, peripheral spiral cord and an extremely thick, multi-layered apertural margin.

Type
Research Article
Information
Journal of Paleontology , Volume 67 , Issue 2 , March 1993 , pp. 194 - 197
Copyright
Copyright © The Paleontological Society 

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