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Silurian Encrinurinae (Trilobita) from the central United States

Published online by Cambridge University Press:  20 May 2016

Kenneth C. Gass ,
Gregory D. Edgecombe ,
Lars Ramsköld ,
Donald G. Mikulic  and
Rodney Watkins
Kenneth C. Gass
Affiliation:
921 11th Street South, Wisconsin Rapids, Wisconsin 54494
Gregory D. Edgecombe
Affiliation:
Department of Invertebrates, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024
Lars Ramsköld
Affiliation:
Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, S-104 05, Stockholm
Donald G. Mikulic
Affiliation:
Illinois State Geological Survey, Natural Resources Building, 615 East Peabody Drive, Champaign 61820
Rodney Watkins
Affiliation:
Department of Geology, Milwaukee Public Museum, 800 W. Wells Street, Milwaukee, Wisconsin 53233
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Abstract

Silurian (Llandovery–Ludlow) Encrinurinae from Wisconsin, Indiana, and Illinois include species of Balizoma Holloway, 1980, Curriella Lamont, 1978, Distyrax Lane, 1988, Encrinurus Emmrich, 1844, Mackenziurus Edgecombe and Chatterton, 1990a, and Nucleurus Ramsköld, 1986. Mackenziurus lauriae n. sp. is described from Wenlock strata of the Racine and Sugar Run Dolomites; nine segments in the holaspid thorax are the fewest known for any encrinurid. A square rostral plate is diagnostic of Mackenziurus. New morphological data are provided by Illinois specimens of Balizoma indianensis (Kindle and Breger, 1904) from the Wenlock–Ludlow Racine Dolomite, and of Curriella tuberculifrons (Weller, 1907) from the Llandovery Elwood–Wilhelmi Formations. Nucleurus n. sp. is possibly from Llandovery strata in Wisconsin. Distyrax n. sp. occurs in the Brandon Bridge Member (late Llandovery–early Wenlock) of the Joliet Dolomite in Illinois. The type pygidia and possible topotype material of Encrinurus nereus Hall, 1867, confirm assignment to that genus as currently viewed; this reefal species is distinct from the closely related inter-reef species E. egani Miller, 1880, and appears to be distinct from reefal E. reflexus Raymond, 1916. Lectotypes are selected for these Encrinurus species.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 1 , January 1992 , pp. 75 - 89
Copyright
Copyright © The Paleontological Society 

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