Petromyzonida

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Petromyzonida [‚pe·trō·mī′zän·ə·də]

(vertebrate zoology)

The lampreys, an order of eellike, jawless vertebrates (Agnatha) distinguished by a single, dorsal nasal opening, and the mouth surrounded by an oral disk and provided with a rasping tongue.

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lamprey
Petromyzontiformes

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