Subclass: Nautiloidea

(4-4-0-0-0-0-0-0-0-0-0-0-0)
Ref. Abbott, 1974 p 569
Lindner, 1978 p 120
Nesis, 1987 p 85,86
Simon & Schuster, 1979 p 495
Syn. Tetrabranchhiata
Ref. Abbott & Dance, 1982 p 389
Vaught, 1989 p x,110
Wagner & Abbott, 1977