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Journal of Paleontology

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THE UPPER CAMBRIAN TRILOBITES PLETHOPELTIS AND LEIOCORYPHE: MORPHOLOGY, PAEDOMORPHISM, CLASSIFICATION

¹ Sedgwick Museum, Department of Earth Sciences, University of Cambridge, CB2 3EQ, United Kingdom

Plethopeltis armatus, and species of Leiocorpyphe, are shown to have in common a median ventral cephalic suture and thoracic axial rings with a poorly-defined articulating furrow and a strong transverse ventral ridge. In other characters they differ greatly, and to group them in the Plethopeltidae is open to question; this family may be polyphyletic. The median ventral suture is regarded as a cardinal character of Asaphida, but it is uncertain whether this character had a single origin or arose more than once. Leiocoryphe gemma may be a paedomorphic species derived from some Upper Cambrian trilobite with an effaced cephalon.

This article has been cited by other articles:

				H. B. WHITTINGTON THE UPPER CAMBRIAN TRILOBITE STENOPILUS: MORPHOLOGY, MODE OF LIFE Journal of Paleontology, February 1, 2005; 79(2): 259 - 266. [Abstract] [Full Text] [PDF]