His hair is formed into a crown with serpents forming a crest.

At the head of the fish, the rays are lengthened forming a distinctive red crest.

The orange feathers can be erected to form a small crest.

The parietal region at the back of the skull forms a sagittal crest.

Especially long hairs are found on the shoulders, and almost form a crest on the upper part of the neck.

The intertemporal region at the top of the skull is long and narrow and forms a raised sagittal crest.

Soft feathers emerge from the base of the bill to form a fan-shaped crest.

Unlike those of other therocephalians, the parietal does not form a distinctive sagittal crest.

The parietals of Kimmerosaurus do not form a sagittal crest.

Based on this evidence, hagfish clearly form a neural crest.