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Hvirvelløse dyr

Hvirvelløse dyr er dyr, der ikke har en ryg (i kontrast til et hvirveldyr, hvilket er et dyr med en ryg med rygmarv omgivet af brusk eller knogle). Velkendte eksempler på hvirvelløse dyr omfatter insekter, krabber, hummere, snegle, muslinger, blæksprutter, søstjerner, søpindsvin og orme.

Størstedelen af dyrearter er hvirvelløse dyr. En vurdering er, at 97% af alt dyreliv består af hvirvelløse dyr.

John James Wild

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