Cretaceous and Eocene Decapod Crustaceans from Southern by C.E. Schweitzer
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 diversified fauna. The Cretaceous decapod fauna, together with formerly defined and new taxa, includes 17 genera in 14 households, represented by means 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 contains one new kin; 3 new genera; 8 new species; and, 9 new mixtures. The decapod fauna of the Nanaimo workforce 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 precise from that of west coastal North the US, suggesting restricted faunal trade among the 2 components. Fewer than 1/2 the decapod genera found in British Columbia in the course of the overdue Cretaceous interval turned extinct by way of the top of the Cretaceous, so much ahead of 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 crucial Americas seem to have been components of speedy evolutionary growth in the Decapoda in the course of 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 resources for Cretaceous and Eocene Decapod Crustaceans from Southern Vancouver Island, British Columbia, Canada
Parameters. 24 Systematic Paleontology Fig. 10. Raninidae de Haan, 1839. 1, Eucorystes platys Schweitzer and Feldmann, 2001, GSC 124811, partial dorsal carapace with clear strap-like ornamentation; 2, E. platys, GSC 124810, partial carapace showing last anterolateral spine (arrow); 3, Macroacaena chica new species, GSC 124818, holotype; 4, reconstruction of dorsal carapace of M. chica; 5, M. chica, paratype, GSC 124819, partial carapace showing blunt protuberance on anterolateral margin (arrow); 6, line drawing showing position and orientation of measurements taken on raninid carapaces in this report.
Schencki Eocene Oregon, USA M. 5 Diagnosis. Carapace longer than wide; rostrum extending further anteriorly than outer-orbital spines; orbital margin with two open fissures; intra-orbital spine stout, long; outer-orbital spine narrow, longer than intra-orbital spine, not as long as rostrum; anterolateral margin with long, needlelike anterolateral spine and blunt protuberance at midlength (Fig. 5). Description. Carapace longer than wide, maximum width as measured about 60% the distance posteriorly about 54% maximum length; carapace surface appearing to have been relatively smooth; weakly vaulted longitudinally and strongly vaulted transversely.
Possibly the two superfamiles adapted for crushing and moderately sized second are quite closely related, and if so, the occurrence through fifth pereiopods; the fifth pereiopods are of fossil dorippoids suggests a divergence in the not carried dorsally (Davie, 2002). These attribtwo lineages as early as the Cretaceous. utes suggest that the necrocarcinids are not allied The Dorippoidea as herein defined originated with the calappids. The dorippids have a more during the Cretaceous and experienced familyangular carapace than typical necrocarcinids, and level extinctions during the Cretaceous and it broadens markedly posteriorly, a condition not Eocene, which eradicated the Necrocarcinidae and seen in most necrocarcinids.