An arthropod is an invertebrate (an animal without a backbone) that has jointed legs and a segmented body. Arthropods are the world's oldest creatures and the most successful invertebrate group. The phylum Arthropoda contains nearly 1,000,000 species and is therefore the largest in the kingdom Animalia.
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An arthropod is an invertebrate (an animal without a backbone) that has jointed legs and a segmented body. Arthropods are the world's oldest creatures and the most successful invertebrate group. The phylum Arthropoda contains nearly 1,000,000 species and is therefore the largest in the kingdom Animalia.