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Journal of Paleontology

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A NEW FAMILY OF TRIASSIC LOBSTERS (DECAPODA: ASTACIDEA) FROM BRITISH COLUMBIA AND ITS PHYLOGENETIC CONTEXT

¹ School of Geology and Geophysics, University of Oklahoma, Norman 73019, <lamati{at}ou.edu>
² Department of Geology, Kent State University, Kent, Ohio 44242, <rfeldman{at}kent.edu>
³ Geological Survey of Canada, 3303-33^rd Street N.W., Calgary, Alberta T2L 2A7, Canada, <jzonneve{at}nrcan.ga.ca>

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.

This article has been cited by other articles:

				J.-P. ZONNEVELD, T. W. BEATTY, and S. G. PEMBERTON LINGULIDE BRACHIOPODS AND THE TRACE FOSSIL LINGULICHNUS FROM THE TRIASSIC OF WESTERN CANADA: IMPLICATIONS FOR FAUNAL RECOVERY AFTER THE END-PERMIAN MASS EXTINCTION Palaios, January 1, 2007; 22(1): 74 - 97. [Abstract] [Full Text] [PDF]