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New Cretaceous Gastropoda from California
Two genera of subtropical to tropical, nearshore-marine nerineid gastropods, Aphanoptyxis and Nerinella, are recognized for the first time in the Cretaceous of California. A listing of Cretaceous nerineid species from between British Columbia and Baja California, an area presently north of the tropics, records 12 species of nerineids, including two new species, Aphanoptyxis californica and Nerinella santana. Aphanoptyxis andersoni nom. nov., of Early Cretaceous (Hauterivian) age from near Ono, northern California, is the earliest Aphanoptyxis recorded in the western hemisphere; A. californica sp. nov., of Late Cretaceous (Turonian) age from near the city of Hornbrook, Siskiyou Co. and Little Cow Creek valley near Redding, Shasta Co., northern California, is the youngest Aphanoptyxis recorded. Nerinella santana sp. nov. is from the Turonian of the Santa Ana Mountains near Los Angeles, southern California. No North American Pacific coast nerineid of younger than Turonian age has been found. Four species originally described as Nerinea have been reallocated to neotaenioglossan families.Two new Cretaceous cerithiform species, which resemble nerineids in having a narrow pleural angle, are: Potamidopsisl grovesi sp. nov., a possible potamidid of Early Cretaceous (Hauterivian) age from near Ono, northern California, and Diozoptyxis ursana sp. nov., a campanilid of Late Cretaceous (Coniacian-Santonian) age from south-east of Redding, Shasta Co., and Chico Creek, Butte Co., northern California. Diozoptyxis ursana is the earliest campanilid recognized from North America.