Naslov
New Cretaceous and Paleogene Decapoda (Astacidae, Thalassinidea, Brachyura) from British Columbia, Canada

Autori
Schweitzer, Carrie ; Feldmann, Rodney ; Ćosović, Vlasta ; Ross, Richard ; Waugh, David

Izvornik
Annals of Carnegie Museum (0097-4463) 77 (2009), 4; 403-423

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Astacidae; Brachyura; Canada; Cretaceous; Decapoda; Eocene; sexual dimorphism; Thalassinidea

Sažetak
A collection of Cretaceous and Eocene specimens of decapod crustaceans from southern Vancouver Island, British Columbia, Canada, has yielded three new genera, Cowichianassa, Comoxianassa, and Preclarocarcinus, and four new species, Cowichianassa meckerti, Comoxianassa haggarti, Preclarocarcinus parvus, and Nitotacarcinus canadensis. The former two new species, each of which are callianassid ghost shrimp, display sexual dimorphism and are well-documented from major and minor claws as well as abdomina, unusual in the fossil record and especially unusual for Cretaceous forms. Nitotacarcinus was previously only known from the Eocene of Denmark ; thus, the new species extends its paleobiogeographic range dramatically. The beds in which the decapods were collected from the Paleogene Via Appia Beds were deposited in generally high-energy conditions favoring the formation of glauconite.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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