Tag Archives: chondrostei

The surviving 25 species of chondrostean fishes are divided between the bichirs and reedfishes (18 extant species of the genera Polypterus and Erpetoichthys) in the Brachiopterygii, and the acipenseriform sturgeons and paddlefishes (Acipenser, Polyodon, and Psephurus). Both groups share primitive characters such as spiracles and a spiral valve, but Polypterus …

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