Fig. 3. Steinernema scapterisci. A) First generation male tail showing 10 pairs of papillae and one single, preanal ventral papilla. B) Structure of a gonad of the first generation female where the ovary reflexes (not reflexed after dissected out). C) Head of an infective juvenile. D) Tail of an infective juvenile. E) Diagrammatic ovary of the first-generation female showing spermatheca. F) Diagrammatic cross section of the spicule blade of the first-generation male showing two lumina (l) and two internal ribs (r).