Amaurolithus tricorniculatus (Gartner, 1967) Gartner and Bukry, 1975 [Ceratolithus]
Description: Right arm extended into apical spur.
Remarks:
Original description:
Variant: A. bizzarus (Bukry, 1973) Gartner and Bukry, 1975 [Ceratolithus] - an ornate variant of A. tricorniculatus, with additional spines. (NB In the original publication the species-name was spelt bizzarus, so it cannot be corrected to bizarrus, even though that would appear a more logical spelling).
Neogene: Amaurolithus; Amaurolithus tricorniculatus; Ceratolithus