Cenomanian
Texas
Original presentation: Acanthoceras johnsonanum Stephenson, 1955
Original publication: Stephenson. 1955. [p. 58, pl. 4, figs 14-17].
Holotype: USNM 108846.
Type locality: USGS locality 14583, Johnson County, Texas (Kennedy and Cobban, 1990a).
Type horizon: Eagle Ford Group (basal) (Kennedy and Cobban, 1990a).
Other specimens: USNM 420270, USNM 420272, USNM 420274, USNM 420279, USNM 420274.
PaleoDB taxon number: 340841.
Reference: Kennedy and Cobban (1990a).