myochordotonal organ

From ZooTerms (Dictionary of Invertebrate Zoology)
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myochordotonal organ: (Arthropoda: Crustacea) In Decapoda, a proprioceptor at the proximal end of the meropodite, a flat membrane lying between the skeleton and sheath of the accessory flexor muscle of the carpus, with distal bipolar sensory cells passing through the membrane and attached to the skeleton; having scolopidia similar to the insect chordotonal organs.