An isolated ramus of the pterygotid eurypteridJaekelopteruscf.howellifrom the Early Devonian (Pragian) Beartooth Butte Formation (Cottonwood Canyon, north-western Wyoming) is described. Pterygotid taxonomy and synonymy is briefly discussed with the generaPterygotus, AcutiramusandJaekelopterusshown 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.
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Lamsdell et al. (2010) studied this question.
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