Jisho

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えんこうるい 円口類
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Noun
1. cyclostomes (eel-like jawless fishes with round mouths used for sucking)​See also 無顎類
Wikipedia definition
2. Cyclostomata​Cyclostomata is a group of chordates that comprises the living jawless fishes: the lampreys and hagfishes. Both groups have round mouths that lack jaws but have retractable horny teeth. The name Cyclostomata means "round mouths". Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
Read “Cyclostomata” on English Wikipedia
Read “円口類” on Japanese Wikipedia
Read “Cyclostomata” on DBpedia

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