Chapter 3 Fish Diversity

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Last updated 4:59 PM on 4/16/26
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8 Terms

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Osteichthyes

bony fishes

advanced jaws

paired fins present

lungs present

either homocercal or heterocercal tail

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Subclass Actinopterygii

ray finned fishes (lepidotrichia)

most are teleosts

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Subclass Sarcopterygii

lobe finned fishes & tetrapods

fleshy, lobed fins

articulating fins

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Chondrichthyes

cartilaginous fishes

placoid scales

ceratotrichia

typically large-bodied predators

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Order Chimaeriformes

deep sea dwellers

heavy dorsal spine

cartilaginous skeleton

jaws

paired fins

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Subclass Elasmobranchii (Sharks, skates, & rays)

heterocercal caudal fin

placoid scales

ceratotrichia

jaws

paired fins

claspers in males

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Lamprey

eel-like body

jawless

no paired fins

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Hagfishes

jawless

degenerate eyes

no paired fins