furca
From ZooTerms (Dictionary of Invertebrate Zoology)
2. (Arthropoda: Crustacea) The caudal furca; cercopod.
3. (Arthropoda: Insecta) a. The cercopods; the forked sternal process arising from the thoracic sternum of pterygote insects formed by the sternal apophyses, supported on a medium inflection; referred to as pro-, meso, or metafurca. b. In Collembola, the modified abdominal jumping appendages
See also: furcula. c. In some male Lepidoptera, the sclerotized structure of the juxta. d. For furca of the labellum, see labellar sclerite.