Chlamydoselachidae
Quick Summary
The family Chlamydoselachidae comprises sharks with diplospondylic vertebrae, including the frilled shark and extinct related forms. The frilled shark, Chlamydoselachus anguineus, is an eel-shaped shark found in deep waters. It has six pairs of gill slits with broad, frilled margins and a terminal mouth. This family is placed within the suborder Notidanoidea or sometimes isolated in its own suborder. Sharks, as part of the Chondrichthyes, evolved from ancestral fishlike vertebrates, with the cartilaginous skeleton being a degenerate rather than primitive trait.123
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