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

  • Gale A. Bishop (a1)

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.

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References

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Bishop, G. A. 1981. Occurrence and fossilization of the Dakoticancer Assemblage, Upper Cretaceous Pierre Shale, S.D., p. 383413. In Gray, J. et al. (eds.), Communities of the Past. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania.
Bishop, G. A. 1982. Homolopsis mendryki: a new fossil crab (Crustacea, Decapoda) from the Late Cretaceous Dakoticancer Assemblage, Pierre Shale (Maastrichtian) of South Dakota. Journal of Paleontology, 56:221225.
Bishop, G. A. 1983. Two new species of crabs, Notopocorystes (Eucorystes) eichhorni and Zygastrocarcinus griesi (Decapoda, Brachyura) from the Bearpaw Shale (Campanian) of north-central Montana. Journal of Paleontology, 57:900910.
Bishop, G. A. 1985. Fossil decapod crustaceans from the Gammon Ferruginous Member, Pierre Shale (Early Campanian), Black Hills, South Dakota. Journal of Paleontology, 59:605624.
Cook, L. T., Collins, R. K. and Davidson, W. F. 1949. Sheet 9, Little Missouri River, Marmarth to North Fork. U.S. Geological Survey River Survey.
Mapel, W. J., Robinson, C. S. and Theobald, P. K. 1959. Geologic and structure contour map of the northern and western flanks of the Black Hills, Wyoming, Montana, and South Dakota. U.S. Geological Survey, Oil and Gas Investigations Map OM-191.
Rathbun, M. J. 1926. The fossil stalk-eyed Crustacea of the Pacific Slope of North America. U.S. National Museum, Bulletin 138:1155.
Whiteaves, J. F. 1885. Note on a decapod crustacean from the Upper Cretaceous of Highwood River, Alberta, Northwest Territories. Royal Society of Canada Transactions for 1884, 2:237238.
Woodward, H. 1896. On some podophthalmatus Crustacea from the Cretaceous formations of Vancouver and Queen Charlotte Islands. Geological Society of London, Quarterly Journal, 52:221228.

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

  • Gale A. Bishop (a1)

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