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)
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Fusion of skull bones
Branchiocranium (endoskeletal arches, original gill arch supports)
Chondrocranium(original cartilagenous braincase)
Dermatocranium (dermal bones attached to skull)
HYOSTYLIC slides along front of skull).
AUTOSTYLICJaw Suspension Evolution
(in larval stages)
hard and pointed
PLACOID slides along front of skull).
CYCLOID slides along front of skull).