By C.E. Schweitzer
A wide number of fossil decapod crustaceans from Cretaceous and Eocene rocks of Vancouver Island, British Columbia, Canada, has yielded a remarkably assorted fauna. The Cretaceous decapod fauna, together with formerly defined and new taxa, comprises 17 genera in 14 households, represented by way of as many as 22 species. The Eocene fauna is much less powerful, with 7 species and six genera in 6 households. This e-book comprises one new kin; 3 new genera; 8 new species; and, 9 new combos. The decapod fauna of the Nanaimo staff helps a place for Wrangellia good north of the present place of Baja California, Mexico. The decapod fauna of the Western inside of North the US is exact from that of west coastal North the USA, suggesting constrained faunal alternate among the 2 components. Fewer than half the decapod genera found in British Columbia throughout the overdue Cretaceous interval grew to become extinct by way of the tip of the Cretaceous, such a lot sooner than the Maastrichtian. of the Cretaceous genera and not one of the Eocene genera are extant; the extant genera are either participants of the Callianassidae. Of the 14 households found in Cretaceous rocks of British Columbia, 5 are extinct. The North Atlantic and critical Americas seem to have been components of fast evolutionary growth in the Decapoda through the Cretaceous, dependent upon the big variety of decapod households that seem to have originated there in the course of Cretaceous time.
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Extra info for Cretaceous and Eocene Decapod Crustaceans from Southern Vancouver Island, British Columbia, Canada
The marked inflection in the lateral margin where the branchiocardiac groove intersects it is more Etymology. The generic name is derived from the typical of dromiids. That taxon should be reevalugenus Diaulax, to which the new genus is most ated. Dromiopsis kimberlyae Bishop, 1987, differs similar, and the Latin root acantho, meaning spine, significantly from the type of the genus and is in reference to the very long outer-orbital and probably not a member of Dromiopsis either. The anterolateral spines, unusual in the family.
The feminine form is used. has a posteriorly rounded carapace that is markedTypes. Holotype, GSC 124818; paratype, GSC ly wider posteriorly and which possess rows of 124819. tubercles, which cannot be accommodated within the Orithopsidae or the Necrocarcinidae. The Occurrence. The specimens were collected from Dorippidae cannot accommodate members of the the late Eocene Via Appia Beds. Necrocarcinidae or the Orithopsidae, as will be discussed below. Discussion. The holotype is relatively complete The Necrocarcinidae and the Orithopsidae new and shows evidence of a very faint dorsal keel.
Bishop, 1983b; Schweitzer and Feldmann, 2001). The Discussion. Two species of Eucorystes are known occurrence of E. platys in Late Cretaceous rocks of from Cretaceous rocks of the Pacific coast of British Columbia extends both its geographic and North America, E. harveyi (Woodward, 1896), and geologic range. Apparently, E. platys and E. harE. platys. Although E. harveyi was collected from veyi coexisted along the Pacific slope during the Late Cretaceous rocks of Hornby and Vancouver Cretaceous; perhaps they occupied different depth islands, the new specimens differ from it in severranges or were separated by other environmental al substantial ways and are nearly identical to E.