These fish have small eyes, wide mouths, and three pairs of barbels.

Their eyes are very small in comparison to the rest of the fish and they have three simple pairs of barbels.

These fish have three pairs of barbels, all similar in length and general appearance.

There is one pair of maxillary barbels and two mental.

The mouth is large, and the fish also possesses a pair of short barbels used in hunting.

These fish have, when they are present, a unique pair of maxillary barbels.

The head has a rounded snout with four pairs of thin barbels.

There are three pairs of barbels and the eyes are small.

They have three pairs of barbels (the nasal pair is absent).

It is a very slender and elongated fish with two pairs of barbels.