Name-bearing types of Onchidium multinotatum and Onchidium pallidipes A digestive system, type III with a transitional loop at 2 o’clock (based on marks left by the intestine in the digestive gland), dorsal view, holotype, O. multinotatum (ZMB/Moll 240117) B digestive system, type III with a transitional loop at 2 o’clock, dorsal view, lectotype, O. pallidipes (NMNH 127328) C anterior, male, copulatory parts, lectotype, O. pallidipes (NMNH 127328). Abbreviations: ag accessory penial gland, dd deferent duct, ddg dorsal lobe of digestive gland, i intestine, pdg posterior lobe of the digestive gland, ps penial sheath, rg rectal gland, rm penial retractor muscle, st stomach, v vestibule. Scale bars: 3 mm (A, B), 2 mm (C).