The concave
area on the
acrotergite on abdominal
tergite 7 that bears the orifice of type III exocrine glands.
written by: Ulmer, J. 2021. The Waterston’s evaporatorium of Ceraphronidae (Ceraphronoidea, Hymenoptera) – A morphological barcode for a cryptic taxon . Journal of Hymenoptera Research.