The fin rays are soft and may number up to 400 or more.

The most common found relationship is for fin ray, vertebrae, or scale numbers to increase with decreasing temperature.

They have feeler-like leading rays and extensions from each fin ray.

Also, they have integumentary teeth called odontodes on their body and fin rays.

The forward set of pelvic fin rays are very elongated.

The tail bore true fin rays like those found in fish.

They had, however, lost several other fish features such as the fin rays in the tail.

The melanophores are few in number and occur at the base of the anal fin rays.

However, the male develops small tubercles on the fin rays during breeding.

The species has a dark spot both on its opercle and lower pectoral fin rays.