Caecidae (Mollusca: Gastropoda) from late Miocene exposures of the “Imperial” Formation in Riverside County, California

Three Caecidae species from two genera have been recovered the late Miocene “Imperial” Formation exposed in Super Creek, north and slightly east of Whitewater, Riverside County, southern California. These specimens record first fossil California older than Pleistocene. The three taxa are Caecum brasilicum de Folin, 1874, Meioceras nitidum (Stimpson, 1851), a new named C. roederi n. sp., honor friend colleague Mark Roeder. M. occur today central-western Atlantic Ocean their previous occurrences also there. occurrence these is not surprising as > 8% Creek fauna has Caribbean origin at level because then submerged Panama seaway that allowed water western to flow freely into eastern Pacific.