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- al prosoma si articolano 6 paia di appendici; il primo è costituito dai cheliceri, molto sviluppati in Scorpioni e Pseudoscorpioni, con funzione prensile; il secondo paio sono i pedipalpi con funzioni prensili, tattili o sessuali; le restanti quattro paia di appendici sono zampe ambulatorie con forme varie che le rendono atte anche al tatto, a scavare, nuotare, trattenere le prede, filare tele (come nei Ragni), ecc.
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Arthropoda (Phylum): Type (or Phylum) of organisms characterized by a body protected by means of a stiff cuticle, made largely of chitin and proteins; generally their body is divided in segments that carry appendices articulated and constituted by one succession of articulated parts, from which their name derive. The Arthropods are the animal group richest of species (million) and have colonized all the available environments in which they constitute great part of the populations. Important Classes of invertebrates are comprised in the Arthropods Phylum: the Crustaceans, the Arachnids, the Insects, etc of which it has been given one definition in other items of the glossary.
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