The teeth in the posterior section of the jaw fragment point strongly backwards.

When the species was first described, only the posterior section of the jaw was known.

The body is sharply keeled in the posterior section.

Its walls are very thick and elastic, with the posterior section being thicker than the front one.

All species have moderate to very strong scutes on the posterior section of their lateral lines.

The anterior section of the radula is much longer than the posterior section.

The lateral line has a short, strong anterior arch, with 40 to 45 scutes on the straight posterior section.

The posterior section is more related to cognitive functions.

The situation is reversed on the posterior section.

The posterior section is composed of 40 to 50 segments.