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A new family of Triassic lobsters (Decapoda: Astacidea) from British Columbia and its phylogenetic context

Published online by Cambridge University Press:  20 May 2016

Lisa Amati ,
Rodney M. Feldmann  and
John-Paul Zonneveld
Lisa Amati
Affiliation:
1School of Geology and Geophysics, University of Oklahoma, Norman 73019,
Rodney M. Feldmann
Affiliation:
2Department of Geology, Kent State University, Kent, Ohio 44242,
John-Paul Zonneveld
Affiliation:
3Geological Survey of Canada, 3303-33rd Street N.W., Calgary, Alberta T2L 2A7, Canada,
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Abstract

Chimaerastacus pacifluvialis, new genus and species, is established on the basis of fossils from the Middle Triassic Liard Formation of northeastern British Columbia. It has well-defined cervical, postcervical, and branchiocardiac grooves; three longitudinal ridges on the cephalic region; and true chelae on the first through third pereiopods. The morphological features of the carapace are a combination of traits used to define both the erymids and the glypheids. A cladistic analysis of 31 decapod genera defines the Astacidea as a monophyletic group, supports the inclusion of the Glypheoidea within the infraorder Astacidea, illustrates the relationships of the Glypheoidea with other astacid groups, and suggests erection of a new family, the Chimaerastacidae, for our new genus and species of decapod. Specimens of C. pacifluvialis are preserved in a sandy bioclastic floatstone that was deposited near the Peace River Embayment in the Middle Triassic. The host lithology suggests that the decapods inhabited a transitional environment between low relief biostromes and the shoreface. This environment provided a unique set of conditions that allowed exceptional preservation of the decapod material.

Type
Research Article
Information
Journal of Paleontology , Volume 78 , Issue 1 , January 2004 , pp. 150 - 168
Copyright
Copyright © The Paleontological Society 

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