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A new crab, Zygastrocarcinus cardsmithi (Crustacea, Decapoda), from the lower Pierre Shale, southeastern Montana

Published online by Cambridge University Press:  14 July 2015

Gale A. Bishop
Gale A. Bishop*
Affiliation:
Department of Geology, Georgia Southern College, Statesboro 30460-8149
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Abstract

The third species belonging to Zygastrocarcinus from the Cretaceous of the Western Interior is represented by a single carapace collected from below the Groat Sandstone Bed, Gammon Ferruginous Member, Pierre Shale of Carter County, Montana. Comparison of Zygastrocarcinus cardsmithi n. sp. with the other North American congeners, Z. mendryki (Bishop, 1982) and Z. griesi Bishop, 1983, and with the Pacific Slope species Z. richardsoni (Woodward, 1896) suggests early separation of the Pacific Slope and Western Interior lineage having Z. cardsmithi as a possible ancestor to Z. mendryki and Z. griesi.

Type
Research Article
Information
Journal of Paleontology , Volume 60 , Issue 5 , September 1986 , pp. 1097 - 1102
Copyright
Copyright © The Paleontological Society 

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References

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