Cenomanian
Texas to Wyoming
Original presentation: Mammites bellsanus
Original publication: Stephenson. 1953. [p. 204, pl. 49, fig. 3, pl. 51, figs 8-11].
Holotype: USNM 105983.
Type locality: Grayson County, Texas (Kennedy and Cobban, 1990a).
Type horizon: Templeton Member of the Woodbine Formation (Kennedy and Cobban, 1990a).
Other specimens: USNM 105984-105986 (note: USNM 105986 is Metoicoceras latoventer Stephenson, 1953 according to Kennedy and Cobban, 1990a).
PaleoDB taxon number: 333426.
Reference: Kennedy and Cobban (1990a).