From ZooTerms (Dictionary of Invertebrate Zoology)
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heteromerous (adjective; Greek heteros, different; meros, part): 1. Nonuniformity in number of parts between organisms of the same species, or organs on the same individual.

See also: homeomerous. 2. (Arthropoda: Insecta) In Coleoptera, the tarsi are usually 5,5,4 segments in both sexes, occasionally 4,4,4, and rarely 3,4,4 in males, very rarely 3,3,3