Invertebrata
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Un invertebrat es un animal desprovesit de colomna vertebrala. Pòt èsser unicellular o pluricellular.
Los invertebrats se subdevesisson en mai d'un sosensemble :
- Los protozoaris
- Los espongiaris
- Los cnidaris e los ctenaris
- Los platelmintes
- Los nematelmintes
- Los annelides
- Los molluscs
- Los artropòdes
- Los equinodermas
La distincion entre vertebrats e invertebrats foguèt iniciada per Jean-Baptiste de Lamarck. Lo grop dels invertebrats essent pas monofiletic, sa valor es remesa en causa dins las classificacions recentas. Permet çaquelà de distinguir lo sosembrancament al qual apartenen los òmes (los vertebrats) de totes los autres animals d'una manièra antropocentrista. Aquò explicariá perqué los biologistas an fòrça de mal a abandonar aquesta classificacion e a la far doblidar al grand public.
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