Skeleton, Skin and Scales. evolutionary time. High # bones. Low # bones. Skull. Evolutionary tendency. Fusion of skull bones. Neurocranium (brain case) Branchiocranium (endoskeletal arches, original gill arch supports). Chondrocranium (original cartilagenous braincase)
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Fusion of skull bones
Branchiocranium (endoskeletal arches, original gill arch supports)
Chondrocranium(original cartilagenous braincase)
Dermatocranium (dermal bones attached to skull)
(in larval stages)
hard and pointed