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krebsdyr

En gruppe af hvirvelløse dyr bestående af omkring 45.000 arter fordelt over hele verden. De er vandlevende eller amfibiske leddyr med hård skal, segmenteret krop og leddematerialer som f.eks. Krabber, hummer, rankefødder, rejer og vandlopper. Krebsdyr er generelt akvatisk og adskiller sig fra andre leddyr i at have to par subkutane (antennules og antenner) foran munden og parrede vedhæng nær munden, der fungerer som kæber. De er en meget vigtig del af den arktiske fødekæde som en del af zooplankton.

Foto: Calanus glacialis, https://earthlingnature.wordpress.com

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