From ZooTerms (Dictionary of Invertebrate Zoology)
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coelomyarian (noun; Greek koilos, hollow; mys, muscle): (NEMATA) Muscle structure in which the contractile fibrils are not only next to the subcuticula, but also extend varying distances up the side of the muscle cell and partially enclose the sarcoplasm

See also: platymyarian, circomyarian.