From ZooTerms (Dictionary of Invertebrate Zoology)
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furcasternum (noun; Latin furca, fork; sternum, breast): (Arthropoda: Insecta) 1. In apterygote insects, that area of the thoracic sternum separated from the basisternum by the sternacosta. 2. In pterygote insects, the bases of the sternal apophyses form the furca, the sternacosta is lost, and the separation of the basisternum and furcasternum is usually obscure.