[2] Bathmoceras is most likely derived from Eothinoceras through lengthening of the septal necks and of the inward projections of the connecting rings in a forward direction.

Flower, 1964, separates the two genera into their respective families within the ellesmerocerid suborder Cyrtocerinina,[3] now known as the order Cyrtocerinida.

[3] One species B. linnarsoni was found in limestone in Sweden which allowed Holms to conduct thin section studies.

The straight or slightly upwardly curved, exogastric shells with weighted ventral siphuncles indicate a normal horizontal orientation with the aperture facing forward.

Most diagnostically, the connecting rings are thickened into forward projecting lobes that may extend internally two or three segments within the siphuncle.