Cenomanian
Texas to Montana
Original presentation: Acanthoceras cuspidum
Original publication: Stephenson. 1953. [p. 202, pl. 50, figs 1-4].
Holotype: USNM 105947.
Type locality: Grayson County, Texas (Kennedy and Cobban, 1990).
Type horizon: “Templeton Member of the Woodbine Formation, Plesiacanthoceras wyomingense zone” (Kennedy and Cobban, 1990, p. 134).
Other specimens: USNM 18971, USNM 14902.
PaleoDB taxon number: 333415.
Reference: Kennedy and Cobban (1990a).