Live animals, Onchidium melakense A dorsal view, holotype, 45 mm long [5979], Peninsular Malaysia (USMMC 00075) B dorsal view, 30 mm long [5978], Peninsular Malaysia (USMMC 00076) C dorsal view, 35 mm long [5981], Peninsular Malaysia (USMMC 00076) D dorsal view, 35 mm long [1769], Sumatra (UMIZ 00001) E ventral view, same as A F ventral view, same as C G dorsal view, 40 mm long [1771], Sumatra (UMIZ 00001).

 
 
  Part of: Dayrat B, Goulding TC, Khalil M, Apte D, Tan SH (2019) A new species and new records of Onchidium slugs (Gastropoda, Euthyneura, Pulmonata, Onchidiidae) in South-East Asia. ZooKeys 892: 27-57. https://doi.org/10.3897/zookeys.892.39524