There is a longitudinal ridge in the center of the test and an anal opening with rolled up edges at the posterior end.

It has a flattened body with three longitudinal ridges, which give it its name.

The common Hill style has a central longitudinal ridge that gives it a faceted appearance.

It is a black-bodied nudibranch with raised white longitudinal ridges.

This condition may also cause nails to become brittle with longitudinal ridges.

It has longitudinal ridges with spines on them throughout its length.

The eggs are a pale, glassy green with longitudinal ridges except on the top.

The egg is green and barrel-shaped with longitudinal ridges.

A longitudinal ridge (keel) is present along the backs of females.

The surface is covered with numerous longitudinal ridges and fine growth lines.