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Crostacei

Un gruppo di animali invertebrati, composto da circa 45.000 specie distribuite in tutto il mondo. Sono artropodi acquatici o anfibi con guscio duro, corpo segmentato e appendici articolati come granchi, aragoste, gamberetti e copepodi. I crostacei si differenziano dagli altri artropodi in presenza di due coppie di appendici (antenne) davanti alla bocca e appendici accoppiati vicino alla bocca che funzionano come ganasce. Sono una parte molto importante della catena alimentare artica come parte del zooplancton.

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

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