The cartilaginous-fish clade, including sharks, ray fish and chimaeras. Extant lack of extensive bone does not demonstrate that their ancestors never possessed it.
The little skate, used experimentally to compare branchial and appendage patterning.
A shark is a cartilaginous fish within Chondrichthyes. Its paired fins, jaws and sensory systems support diverse ways of life. The group includes both active predators and filter-feeding forms, so one feeding stereotype does not define it.
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