Fig. 27 in Braincase Of The Upper Devonian Shark Cladodoides Wildungensis (Chondrichthyes, Elasmobranchii With Observations On The Braincase In Early Chondrichthyans

Fig. 27. Comparison of the cranial endocast in Cladodoides (A, D) and Notorynchus (B, C). The endocasts are positioned with their anterior ampullae aligned. Note the greater length of the mesencephalic chamber in Cladodoides, resulting in a more anterior location of the hypophyseal chamber and foramina for the oculomotor and optic nerves and efferent pseudobranchial artery. Despite these differences, the position of the trochlear foramen is similar, suggesting that the proportions of the mesencephalic chamber primarily involve its ventral part and may be related to differential development of the polar cartilage. Not to scale.