Digestive system, dorsal view, Peronia verruculata (Red Sea). The arrow indicates the orientation of the transitional loop A lectotype, Onchidium verruculatum, Red Sea (MNHN-IM-2000-22941) B lectotype, Peronia anomala, Red Sea (MNHN-IM-2000-33678) C lectotype, Onchidium durum, Red Sea (MNHN-IM-2000-33698) D paralectotype, Paraperonia gondwanae, Red Sea (MNHN-IM-2000-33684) E paralectotype, Paraperonia gondwanae, locality unknown (MNHN-IM-2000-33688) F Red Sea, spm #1 (ZMH 27472/4). Scale bars: 5 mm (A, D), 4 mm (B, E), 3 mm (C, F). Abbreviations: ddg dorsal digestive gland, i intestine, pdg posterior digestive gland, st stomach.