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Journal of Paleontology

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New Porcellioidean Gastropods from Early Devonian of Royal Creek Area, Yukon Territory, Canada, with Notes on Their Early Phylogeny

Jií Frda¹, Robert B. Blodgett², Alfred C. Lenz³ and tpán Manda¹

¹ Czech Geological Survey, Klárov 3/131, 118 21 Praha 1, and Faculty of Environmental Sciences, CULS, 165 21 Prague 6, Czech Republic, <fryda{at}cgu.cz>
² U.S. Geological Survey—Contractor, 4200 University Drive, Anchorage, Alaska 99508, USA, <rblodgett{at}usgs.gov>
³ Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada, <aclenz{at}julian.uwo.ca>

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.