sternal apophysis
From ZooTerms (Dictionary of Invertebrate Zoology)
sternal apophysis also pleural apophysis: (Arthropoda: Insecta) One of a pair of lateral apodemal arms of the eusternum marked by pits joined by a sulcus, thus dividing the eusternum into a basisternum and a sternellum; in higher insects they arise in the midline and separate internally, forming the Y-shaped furca.
