Exam 16: Fishes

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The lobe-finned fishes consist of the extinct _____________ and the extant coelacanths.

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rhipidistians

The earliest fishlike vertebrates were a paraphyletic assemblage of agnathans.

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In North America,both marine and freshwater lampreys spawn in freshwater streams.

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At the latest,the early vertebrates branched into the agnathans and the gnathostomes during the Cambrian period.

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The _________ is composed of vertebrates having eel-like bodies,a biting mouth with two rows of eversible teeth,and numerous slime glands.

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The ___________ is composed of vertebrates having placoid scales,a heterocercal caudal fin,a ventral mouth,and a cartilaginous endoskeleton.

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A representative of chondrosteans is

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The control of the lamprey has been accomplished around the Great Lakes by

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The chondrosteans are one group of the most primitive of the ray-finned fishes.

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The ray-finned fishes belong to the class Sarcopterygii.

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Unlike other vertebrates,the body fluids of hagfishes are

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One lineage of the neopterygian fishes gave rise to the modern bony fishes.

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Declines in the salmon population in the northwest of the U.S.have resulted in 25% fewer fish migrating up the Columbia and Snake Rivers. Multiple Choice Questions

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Like a leech,the lamprey secretes _____________ into the wound of its host fish.

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The coelocanths

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Despite its name,the ectoparasitic marine lamprey Petromyzon marinus ascends freshwater streams to spawn.

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Fishes such as the Atlantic salmon that spend their adult lives at sea but return to fresh water to spawn are called __________.

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The fisheries of the Great Lakes were brought to almost total collapse in this century by the invasion of the __________.

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The ampullary organs of Lorenzini are receptors for detecting weak electrical fields.

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The lungfishes

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