Treasures of the American Museum of Natural History

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Macintosh Picture Format | 1996-09-10 | 183KB | 640x310 | 8-bit (229 colors)

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OCR: Tree Fishes Sharks. for example have five pairs of gill openings while bass and herring have only one Studies comparing these fishes with the more primitive lampreys which have many gill slits reveal that the single gill slit is more advanced than multiple ones. The cladogram therefore branches twice the first branch leading to the sharks and the second to the bass and herring This arrangement indicates that the bass and herring share common ancestor that was not an immediate ancestor of the shark.