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Uncommon Cretaceous naticiform gastropods from the Pacific slope of North America


, : Uncommon Cretaceous naticiform gastropods from the Pacific slope of North America. Veliger uary 2; 47(1): 21-37

Five naticiform gastropod species, not commonly found in Cretaceous rocks on the Pacific slope of North America, are described, and their paleobiogeographic implications are discussed. The moderately large Tylostoma allisoni, sp. nov. of Early Cretaceous (late Aptian) age from northern Baja California, Mexico, represents the earliest record of this tylostomatid genus in North America. Restudy of the Late Cretaceous (late early to early late Maastrichtian) Phasianella garzana Anderson, 1958, from central California, revealed that it might be a Tylostoma. These two species, along with Tylostoma? sp. indet. of late Aptian age from northern Baja California, represent all the known occurrences of this genus from the study area. Tylostoma is a cosmopolitan gastropod genus that originated during the Late Jurassic in the Old World Tethys Sea region. The very rare Pictavia santana, sp. nov. of Late Cretaceous (late Turonian) age from southern California represents the first and youngest record of this obscure naticiform genus in the New World. Pictavia originated during the Late Triassic in the Tethys Sea region. The moderately large Prisconatica hesperia, sp. nov. of Late Cretaceous (late Santonian to early Campanian) age, from near Nanaimo, Vancouver Island, British Columbia, and rare in the Santa Ana Mountains, southern California, represents the first record of this obscure naticiform genus on the Pacific slope of North America, as well as its youngest and northernmost record. Prisconatica apparently originated during the Early Cretaceous (Albian) in the New World.

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