From ZooTerms (Dictionary of Invertebrate Zoology)
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transtilla (noun; plural -lae; Latin trans-, across; stilla, drop): (Arthropoda: Insecta) In Lepidoptera, a transverse bar, or variously shaped process, connecting dorso-proximal angles of the male valva; part of the fultura superior; the anterior end of the dorsal extension of the 9th sternum or the vinculum.