“All of these studies have presupposed acanthodian monophyly and stereotyped acanthodian endoskeletal morphology on Acanthodes, the latest-occurring, and a highly apomorphic genus.”
“These supportive systems are endoskeletal but do not develop in conjunction with guts or nerve cords.”
“The neural and costal plates of the dorsal disk form as the outgrowths of these endoskeletal bones on inside the dermis.”
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