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A revision of Palaeacmaea (Upper Cambrian) (?Cnidaria)

Published online by Cambridge University Press:  14 July 2015

Gerald F. Webers  and
Ellis L. Yochelson
Gerald F. Webers
Affiliation:
Geology Department, Macalester College, St. Paul, Minnesota 55105
Ellis L. Yochelson
Affiliation:
National Museum of Natural History, Washington, D.C 20560
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Abstract

Palaeacmaea typica, the type species of the genus, and P. irvingi, the only other Late Cambrian taxon considered congeneric are redescribed herein. Their morphology suggests that they are neither Monoplacophora, where they are currently assigned, nor are they Mollusca. Specimens of P. irvingi demonstrate considerable variation in shape, interpreted as distortion of a flexible integument, of essentially no thickness. A neotype is designated for P. irvingi; it is interpreted as a medusiform fossil, possibly a cnidarian. Only the holotype of P. typica is known, but it shows comparable features. The genus and the family Palaeacmaeide are placed in Phylum Incertae Sedis. Four Ordovician species previously assigned to Palaeacmaea, show none of the characteristics noted, and they are tentatively reassigned to other genera.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 4 , July 1999 , pp. 598 - 607
Copyright
Copyright © The Paleontological Society 

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