Gastropoda - Opisthobranchiata - Akeridae
Parent taxon: Opisthobranchiata according to U. S. Grant, IV and H. R. Gale 1931
See also Addicott 1970 and Beesley 1998
Sister taxa: Acanthotrophia, Acochlidea, Buscotypus, Canepina, Cephalaspida, Cephalaspidea, Cylindrobullinoidea, Floribella, Gymnosomata, Heteroptygmatis, Heterostrophia, Lutima, Mariottia, Mistostigma, Nicosiaella, Notaspidea, Paronaella, Pseudofusia, Reticulacella, Rhodopemorpha, Scorbinidola, Tectibranchia, Thecosomata, Umbraculomorpha
Subtaxa: Akera
Ecology: epifaunal
Distribution:
• Quaternary of Australia (1 collection)
• Miocene of France (1)
• Oligocene of Italy (1), Pakistan (1)
• Eocene of Colombia (2), Indonesia (1), Pakistan (7), Romania (3), United States (5: California, Texas)
• Paleocene of France (1)
• Cretaceous of Angola (1), Brazil (1), Egypt (2), United States (1: Texas)
• Jurassic of Saudi Arabia (2), Tanzania (1)
Total: 31 collections each including a single occurrence