this work, hereby publish it under the following license: English Spiral shark fins Chinese 于发行鲍翅 author name string: Fumikas Sagisavas Wikimedia username:...
provided with a spiral valve, like Elasmobranchii. They have a swimming-bladder with a duct, like many Teleostei. Their pelvic fins are abdominal. "...
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spiral valve helps with digestion by increasing the surface area for absorption of nutrients in the intestines. Some sharks have this feature. Fins There...
differ considerably from the Sharks. The skate type is not always developed to the same extent; in some forms the pectoral fins are smaller, the tail more...
(Proselachius), closely related to the existing Sharks, and hypothetical ancestors of Man (the fins are omitted). The spinal tube has differentiated...
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