Photographs of Gonipterus platensis penis showing details of the endophallus. A) Penis, lateral view of left side with endophallus everted. B) Detail of apical sclerites, dorsal view. C) Detail of apical sclerites, ventral view. D) Detail of crescent-shaped sclerites, lateral view; acs = accessory sclerites; bp = basal piece, lar = left apical rod, mar = medial apical rod, mp = membranous pouch, pt = teeth on proximal margin of basal piece, rar = right apical rod, rt = teeth on dorsal surface of left apical rod.