Fig. 38 in Braincase Of The Upper Devonian Shark Cladodoides Wildungensis (Chondrichthyes, Elasmobranchii With Observations On The Braincase In Early Chondrichthyans

Fig. 38. Diagrammatic representations of the posterior dorsal fontanelle, otic capsules, synotic tectum, and occipital arch in various elasmobranchs. Dorsal views, anterior to top: (A) Pucapampella or Tamiobatis; posterior tectum absent, fontanelle confluent with otico­occipital fissure, occipital arch complete; (B) Cladodoides; posterior tectum present, fontanelle separated from fissure, occipital arch complete; (C) 62­mm Heterodontus; medial tectum extends from synotic tectum and meets complete occipital arch pri­ or to its fusion with otic capsules (D) 48­mm Squalus; occipital pilae fused to otic capsules pri­ or to closure of occipital arch dorsally. Panels C and D are based on figures in Holmgren (1940). Not to scale.