Gill rakers are found in both chondrichthyans and in Osteichthyes, as well as acanthodians. |
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The division Teleostei within the Osteichthyes is made up of 38 orders. |
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Fish included many elasmobranchs as well as osteichthyes such as palaeoniscoids, dipnoi, selachians, and crossopterygians, together with the ancient acanthodians. |
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Only fragmentary remains are known of animals that may represent early stages in the differentiation of placoderms, chondrichthyes, and osteichthyes. |
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