gonangulum

From ZooTerms (Dictionary of Invertebrate Zoology)
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gonangulum (noun; Greek gone, that which produces seed; Latin angulus, angle): (Arthropoda: Insecta) A small sclerite attached to the base of the first gonapophysis articulating with the second gonocoxa and the tergum of segment 9 in Lepisma; in others fused with the first gonocoxa or with tergum 9.