Two flat fish are depicted on a fish-shaped rock. The top one (long. 30 cm) has been made with a deep carving, which becomes gentler in the longitudinal fins extending from the animal's back and abdomen. The caudal fin can clearly be made out. Between the two runs the side line.
This is a flat fish, similar to a plaice, dory or sole. The specimen of Altxerri is most similar to a plaice.
In front of this figure, there is the unfinished outline of a flat fish. The zoological classification may be the same.
