<P> An arthropod ( / ˈɑːrθrəpɒd / , from Greek ἄρθρον arthron , `` joint '' and πούς pous , `` foot '' ) is an invertebrate animal having an exoskeleton ( external skeleton ) , a segmented body , and paired jointed appendages . Arthropods form the phylum Euarthropoda , which includes insects , arachnids , myriapods , and crustaceans . The term Arthropoda as originally proposed refers to a proposed grouping of Euarthropods and the phylum Onychophora . Arthropods are characterized by their jointed limbs and cuticle made of chitin , often mineralised with calcium carbonate . The arthropod body plan consists of segments , each with a pair of appendages . The rigid cuticle inhibits growth , so arthropods replace it periodically by moulting . </P>
<P> An arthropod ( / ˈɑːrθrəpɒd / , from Greek ἄρθρον arthron , `` joint '' and πούς pous , `` foot '' ) is an invertebrate animal having an exoskeleton ( external skeleton ) , a segmented body , and paired jointed appendages . Arthropods form the phylum Euarthropoda , which includes insects , arachnids , myriapods , and crustaceans . The term Arthropoda as originally proposed refers to a proposed grouping of Euarthropods and the phylum Onychophora . Arthropods are characterized by their jointed limbs and cuticle made of chitin , often mineralised with calcium carbonate . The arthropod body plan consists of segments , each with a pair of appendages . The rigid cuticle inhibits growth , so arthropods replace it periodically by moulting . </P>
what type of skeleton does a spider have
what type of skeleton does a spider have
an exoskeleton
an exoskeleton