They were likely marine bottom feeders, characterized by a steep dorsal crest and a greatly inclined head.

The anterior median dorsal plate was characterized by a protruding, tall, laterally compressed crest that tapers posteriously and continuously onto the posterior median dorsal plate.

Dorsal lateral line grooves were not found present.

The anterior ventro-lateral plate presented a rather short subcephalic component, resulting in a steep inclination of the head forward.

However, while most antiarchs predominantly inhabited freshwater lakes and streams, Grossaspis were adapted to marine environments.