Wikipedia
Pseudobrevicoceras
Pseudobrevicoceras is an extinct nautilitoid cephalopod genus in the order Oncocerida. The familial position is undetermined.
Externally Pseudobrevicoceras resembles Brevicoceras, an oncocerid in the Brevicoceratidae, in having a curved, expanded, breviconic phragmocone with straight, transverse sutures.