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A primitive Halobia (Bivalvia: Halobioidea) from the Triassic of northeast British Columbia

Published online by Cambridge University Press:  20 May 2016

Christopher A. Mcroberts
Christopher A. Mcroberts*
Affiliation:
Department of Geology, State University of New York College at Cortland, P.O. Box 2000, Cortland 13045,
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Abstract

Halobia daonellaformis new species is described from the lowermost Carnian of northeast British Columbia. Halobia daonellaformis n. sp. is regarded as a primitive Halobia characterized by external ornamentation similar to Daonella lommeli, but with a poorly developed anterior auricle. Morphologic characters of H. daonellaformis n. sp. suggest that Halobia may be not a natural taxon but a polyphyletic group with one or more ancestors from Daonella and Aparimella and/or other posidoniid(s). The sudden appearance of Halobia throughout the marine Triassic suggests a rapid dispersal mechanism following a Ladinian origin. Larval shell morphology indicates a planktotrophic developmental strategy for H. daonellaformis n. sp., and by extension to other halobiids, which may explain the widespread distribution of many halobiid species.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 4 , July 2000 , pp. 599 - 603
Copyright
Copyright © The Paleontological Society 2000

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