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CLASA CRUSTACEA -arthropode cu tegumentul chitinos, deseori incrustat cu saruri calcaroase; -corpul este bine segmentat,impartit in cap, torace si les nemathelminthes ppt -la cap prezinta 5 perechi de apendice : o pereche de antene, o pereche de mandibule si 2 perechi de maxile; -toracele are un numar variabil de segmente, uneori diferit si dupa specie; -abdomenul se termina cu un telson, care poate fi contopit cu ultimul segment abdominal; -respiratia este branhiala sau cutanee; -sexele sunt in general separate, dar exista si forme hermafrodite; - majoritatea sunt specii acvatice, dar se intalnesc si forme de uscat, populand mai ales medii umede. CLASA MYRIAPODA - cupride arthropode terestre cu respiratia traheana ; - corp alungit :cap si trunchi; - trunchiul este format din numeroase segmente, purtand fiecare perechi de picioare articulate; -regimul de hrana este fitofag sau carnivor; - majoritatea speciilor se hranesc cu diferite vegetale in descompunere, dar sunt si unele specii care pot produce vatamari la plante solarii, ciupercarii, etc. Cricetidae Cricetus cricetus.