They embody the largest animal phylum, the Arthropoda, which incorporates bugs, spiders, crabs, and their kin. All of those have a body divided into repeating segments, sometimes with paired appendages. Two smaller phyla, the Onychophora and Tardigrada, are shut Animals relatives of the arthropods and share these traits. The ecdysozoans also embrace the Nematoda or roundworms, perhaps the second largest animal phylum.
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Their relationships are still disputed; the sister group to all other animals could be the Porifera or the Ctenophora, each of which lack hox genes, essential in body plan development. Many animal phyla first appear in the fossil report in the course animal … Read the rest