Adenobrechmos greeri n. gen., n. sp. from the intestines of the skink Sphenomorphus aignanus (Scincidae) is described and illustrated. Adenobrechmos greeri n. sp. is unique among the Proteocephalidae by possessing an unarmed apical gland. The presence of the unarmed apical gland as well as an aspinose rostrum allows the erection of a new subfamily, Adenobrechmoinae, for the new genus. Adenobrechmos greeri n. sp. is the fourth species of Proteocephalidae reported to infect New Guinean reptiles.