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1 July 2003 THE UPPER CAMBRIAN TRILOBITES PLETHOPELTIS AND LEIOCORYPHE: MORPHOLOGY, PAEDOMORPHISM, CLASSIFICATION
HARRY B. WHITTINGTON
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Abstract

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.

HARRY B. WHITTINGTON "THE UPPER CAMBRIAN TRILOBITES PLETHOPELTIS AND LEIOCORYPHE: MORPHOLOGY, PAEDOMORPHISM, CLASSIFICATION," Journal of Paleontology 77(4), 698-705, (1 July 2003). https://doi.org/10.1666/0022-3360(2003)077<0698:TUCTPA>2.0.CO;2
Accepted: 1 October 2002; Published: 1 July 2003
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