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History
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Teleost
Teleost
Skull and jaw anatomy
Skull and jaw anatomy
Caudal skeleton showing symmetrical (homocercal) tail
Caudal skeleton showing symmetrical (homocercal) tail
Aspidorhynchus acustirostris, an early teleost from the Middle Jurassic
Aspidorhynchus acustirostris, an early teleost from the Middle Jurassic
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Actinopterygii
Actinopterygii
Anatomy of a typical ray-finned fish (cichlid) A: dorsal fin, B: fin rays, C: lateral line, D: kidney, E: swim bladder, F: Weberian apparatus, G: inne
Anatomy of a typical ray-finned fish (cichlid) A: dorsal fin, B: fin rays, C: lateral line, D: kidney, E: swim bladder, F: Weberian apparatus, G: inner ear, H: brain, I: nostrils, L: eye, M: gills, N: heart, O: stomach, P: gall bladder, Q: spleen, R: internal sex organs (ovaries or testes), S: ventral fins, T: spine, U: anal fin, V: tail (caudal fin). Possible other parts not shown: barbels, adipose fin, external genitalia (gonopodium)
Tuna are streamlined for straight line speed with a deeply forked tail
Tuna are streamlined for straight line speed with a deeply forked tail
Cod have three dorsal and two anal fins, which give them great maneuverability
Cod have three dorsal and two anal fins, which give them great maneuverability