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Jawed vertebrates are divided again into two groups, the cartilaginous Chondrichthyes (represented by sharks, rays, and chimeras) and the bony Osteichthyes .
Gill rakers are found in both chondrichthyans and in Osteichthyes , as well as acanthodians.
The other two large groups are the class of Crustacea (Shrimp, Lobster, Crab) and Osteichthyes (bony fish).
The division Teleostei within the Osteichthyes (bony fish) is made up of 38 orders.
Our analyses also give a strong support for the separation of Chondrichthyes (cartilaginous fishes) before the divergence of Osteichthyes (bony fishes) from the other gnathostomes.
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