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1 November 2010 An Isolated Pterygotid Ramus (Chelicerata: Eurypterida) from the Devonian Beartooth Butte Formation, Wyoming
James C. Lamsdell, David A. Legg
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Abstract

An isolated ramus of the pterygotid eurypterid Jaekelopterus cf. howelli from the Early Devonian (Pragian) Beartooth Butte Formation (Cottonwood Canyon, north-western Wyoming) is described. Pterygotid taxonomy and synonymy is briefly discussed with the genera Pterygotus, Acutiramus and Jaekelopterus shown to be potential synonyms. The use of cheliceral denticulation patterns as a generic-level character is discouraged in light of variations within genera and its unsuitability as a major characteristic in the other eurypterid families.

James C. Lamsdell and David A. Legg "An Isolated Pterygotid Ramus (Chelicerata: Eurypterida) from the Devonian Beartooth Butte Formation, Wyoming," Journal of Paleontology 84(6), 1206-1208, (1 November 2010). https://doi.org/10.1666/10-040.1
Accepted: 16 June 2010; Published: 1 November 2010
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KEYWORDS
Eurypterida
Jaekelopterus
Pterygotoidea
taxonomic diversity
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