Fig. 6
From: Morphological development of the dorsal hindbrain in an elasmobranch fish (Leucoraja erinacea)
Vertebrate phylogeny showing the presence of the cerebellum and cerebellum-like structures. Presence of structures is marked by blue, and loss is marked by red. Light red in the hagfish lineage represents a partial loss of the MON. From left to right, animals are representatives from Agnatha, Holocephali and Elasmobranchii (Chondrichthyes), Mormyridae and Cyprinidae (Actinopterygii), Urodela and Anura (Amphibia), Reptilia, Aves, and Mammalia. Cb, cerebellum; DCoN, dorsal cochlear nucleus; DON, dorsal nucleus; ELL, electrosensory lateral lobe; MON, medial nucleus; SMOT, stratum marginale of the optic tectum