opisthosoma

From ZooTerms (Dictionary of Invertebrate Zoology)
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opisthosoma (noun; Greek opisthen, behind; soma, body): 1. (Arthropoda: Chelicerata) In Acari or Ixodida, that portion of the body posterior to the legs.

2. (Pogonophora) A terminal septate region

See also: protosoma, metasoma, mesosoma.