They are marked by strong axial ribs, of which about 20 occur upon all the whorls.

Inner and middle whorls have strong ribs with large spines at the outer ends.

The shell is pale yellowish or almost white, with distant strong ribs.

This ammonite has only a few strong ribs, with a number of small tubercles in addition.

Usually it is quite elongated, with strong axial ribs.

The umbilicus is deep, bounded by a strong white rib, about 1 mm.

The nucleus is smooth, the other whorls have strong ribs, of which there are 12 on the body whorl.

The surface of the shell is marked by strong axial ribs.

The strong radial ribs often have small red, thorn-like sculpturing.

The anterior section of the ventral side has strong transverse ribs.