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Early Silurian (Llandovery) encrinurine trilobites from the Mackenzie Mountains, Canada

Published online by Cambridge University Press:  20 May 2016

Gregory D. Edgecombe  and
Brian D. E. Chatterton
Gregory D. Edgecombe
Affiliation:
Department of Invertebrates, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, Department of Geological Sciences, Columbia University, New York, New York 10027 and
Brian D. E. Chatterton
Affiliation:
Department of Geology, University of Alberta, Edmonton, Canada T6G 2E3
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Abstract

Llandovery Encrinurinae from the Whittaker Formation in the central Mackenzie Mountains include Cromus canorus n. sp., Distyrax cooperi n. sp., Distyrax n. sp. A, Perryus bartletti n. sp., and Encrinurus n. sp. Additional diversity of Distyrax Lane, 1988, demands a revised generic diagnosis with emphasis on pygidial homologies; new species are described from the Llandovery of Newfoundland and Ontario. Several characters suggest a sister group relationship between Distyrax and Encrinurus s.s. A lectotype is designated for the Llandovery species Encrinurus elegantulus Billings, 1866. Cromus canorus n. sp. is closely allied to other northern Laurentian Llandovery species. Synapomorphies of Cromus are inclusive for Encrinuraspis as revised by Snajdr, 1985. The long stratigraphic range and morphological conservatism of Cromus are correlated with occurrence in distal mudstone facies. Ontogenetic material for Distyrax n. sp. A, Cromus canorus, and Perryus bartletti is described, with consideration of librigenal spine homologies in Encrinurinae. Humaencrinuroides Nan, 1985, is a pliomerid of the new subfamily Quinquecostinae, and not a subgenus of Encrinuroides Reed.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 1 , January 1992 , pp. 52 - 74
Copyright
Copyright © The Paleontological Society 

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