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

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