WE glands and sculpture of evaporatorium in Ceraphronidae (SEM) A ventral side T5 of Aphanogmus sp. showing median-ventral concavity corresponding to position of Waterston’s organ on T6. B glandular subunits of the Waterston’s organ extending into abdominal body cavity from ventral side of T6 and evaporatorium C evaporatorium and bulla of Aphanogmus D evaporatorium topography in Ceraphron, a reticulate matrix of empty cells. Mvc = median ventral concavity of T5 eg = evaporatorium glandules ev = evaporatorium at cx = acrotergal calyx bu = bulla; at = acrotergite.