One genus and six new species of ostracodes are described from the Bateque Formation on the Pacific Coast
of Baja California Sur, Mexico. Planktonic foraminifers indicate a mid Eocene age and the whole assemblage
is characteristic of a shallow warm-water environment. Paijenborchella mezquitalensis sp. nov. is the second
record of the genus Paijenborchella from the Eocene of North America. Except for this species and the new
genus Bajacythere, the ostracode association has strong affinities with those described from the lower
Tertiary Gulf Coast region.