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Morphologic change in the clawed lobster Hoploparia (Nephropidae) from the Cretaceous of Antarctica

Published online by Cambridge University Press:  08 February 2016

D. Tshudy
Affiliation:
Department of Geosciences, Edinboro University of Pennsylvania, Edinboro, Pennsylvania 16444
T. K. Baumiller
Affiliation:
Museum of Paleontology, University of Michigan, Ann Arbor, Michigan 48109
U. Sorhannus
Affiliation:
Department of Biology, Edinboro University of Pennsylvania, Edinboro, Pennsylvania 16444

Abstract

Antarctic Hoploparia exhibit morphologic changes upsection in a stratigraphic record considered to be long (approximately 15 m.y.) and free of major hiatuses. Five characters exhibit change upsection, and the overall morphologies of the geologically oldest and youngest lobsters are different. The observed patterns could be the result of either phyletic evolution or gradual invasion of one or more species into the range of the original species. The most parsimonious interpretation of the data argues against the invasion hypothesis but supports the phyletic evolution hypothesis.

Type
Articles
Copyright
Copyright © The Paleontological Society 

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