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1 May 2008 New Porcellioidean Gastropods from Early Devonian of Royal Creek Area, Yukon Territory, Canada, with Notes on Their Early Phylogeny
Jiří Frýda, Robert B. Blodgett, Alfred C. Lenz, Štěpán Manda
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Abstract

This paper presents a description of new gastropods belonging to the superfamily Porcellioidea (Vetigastropoda) from the richly diverse Lower Devonian gastropod fauna of the Road River Formation in the Royal Creek area, Yukon Territory. This fauna belongs to Western Canada Province of the Old World Realm. The Pragian species Porcellia (Porcellia) yukonensis n. sp. and Porcellia (Paraporcellia) sp. represent the oldest presently known members of subgenera Porcellia (Porcellia) and Porcellia (Paraporcellia). Their simple shell ornamentation fits well with an earlier described evolutionary trend in shell morphology of the Porcellinae. Late Pragian to early Emsian Perryconcha pulchra n. gen. and n. sp. is the first member of the Porcellioidea bearing a row of tremata on adult teleoconch whorls. The occurrence of this shell feature in the Porcellioidea is additional evidence that the evolution of the apertural slit was much more complicated than has been proposed in classical models of Paleozoic gastropod evolution.

Jiří Frýda, Robert B. Blodgett, Alfred C. Lenz, and Štěpán Manda "New Porcellioidean Gastropods from Early Devonian of Royal Creek Area, Yukon Territory, Canada, with Notes on Their Early Phylogeny," Journal of Paleontology 82(3), 595-603, (1 May 2008). https://doi.org/10.1666/07-024.1
Accepted: 1 July 2007; Published: 1 May 2008
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