By C.E. Schweitzer
A wide choice of fossil decapod crustaceans from Cretaceous and Eocene rocks of Vancouver Island, British Columbia, Canada, has yielded a remarkably different fauna. The Cretaceous decapod fauna, together with formerly defined and new taxa, includes 17 genera in 14 households, represented by way of as many as 22 species. The Eocene fauna is much less strong, with 7 species and six genera in 6 households. This ebook comprises one new kinfolk; 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 USA is specified 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 past due Cretaceous interval turned extinct by way of the tip of the Cretaceous, so much earlier 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 significant Americas seem to have been components of fast evolutionary growth in the Decapoda through the Cretaceous, dependent upon the massive variety of decapod households that seem to have originated there in the course of Cretaceous time.
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Additional info for Cretaceous and Eocene Decapod Crustaceans from Southern Vancouver Island, British Columbia, Canada
Alseana (Rathbun, 1932), as anterolateral spine and the outer-orbital spine is Lyreidus; M. bispinulata (Collins and about 25 to 30% the maximum length of the caraRasmussen, 1992), as Lyreidus; M. chica new pace (Fig. 1). The carapace is widest about 60% species; M. fudouji (Karasawa, 2000b), as the distance posteriorly (Fig. 2). The front is triCarinaranina; M. ; M. marionae (Tucker, and the orbits have two open fissures which define 1998), as Carinaranina; M. naselensis (Rathbun, an intra-orbital spine.
Fig. 14. Family Orithopsidae, Paradoxicarcinus nimonoides new genus and species. 1, GSC 124827, paratype, dorsal carapace; 2, composite reconstruction of the dorsal carapace; 3, GSC 124826, holotype, dorsal carapace with incredible preservation of long anterolateral spines; 4, GSC 124827, oblique anterolateral view showing orbital flange. Scale bars = 1 cm. 41 Cretaceous and Eocene Decapod Crustaceans into Necrocarcinus better than any other fossil Diagnosis. As for species. genus" (p. 85), and her comparison of it with the extant genus Orithyia.
Species Age Geographic Occurrence M. alseana Eocene–Oligocene Pacific Northwest, North America M. bispinulata Paleocene Greenland M. chica new species late Eocene Vancouver Island, BC, Canada M. fudouji Miocene Japan M. leucosiae Eocene Oregon, USA M. marionae Eocene Washington, USA M. naselensis Oligocene Washington, USA M. rosenkrantzi Maastrichtian Greenland M. 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.