Late Paleocene Architectonicidae (Gastropoda: Heterobranchia) from Baja California, Mexico

Six gastropod species including two new ones, belonging to the family Architectonicidae, of the genera Architectonica, Granosolarium and Pseudomalaxis, are described for the Late Paleocene Sepultura Formation in Baja California, northwestern Mexico. The new species Architectonica bieleri and Architectonica bajaensis are established from well preserved specimens. The genera Granosolarium and Pseudomalaxis are for the first time reported in Baja California.