Order: Archaeogastropoda <"ancient stomach-footed"> J. Thiele, 1925

(5-4-1-0-0-0-0-0-0-0-0-0-0)
Ref. Abbott, 1974 p 15
Abbott, 1989 p 33,208
Abbott & Dance, 1982 p 18
Amer. Fish. Soc., 1988 p 52
Keen, 1971 p 307
Lindberg, 1981 p 18
Vaught, 1989 p viii,5
Syn. Diotocardia
Ref. Marcus & Marcus, 1967 p 5,142