| Rathouisiidae, Opisthostoma, Veronicellidae, Diplommatinidae, Systellommatophora|
Atopos is a genus of carnivorous air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Rathouisiidae.
Species within the genus Atopos include:Atopos australis Heynemann, 1876
Atopos laidlawi Collinge
Atopos maximus Collinge 1903
Atopos ouwensi Collinge, 1908
Atopos prismatica Tapparone-Canefri, 1883
Atopos punctata Collinge, 1902
Atopos rugosus Collinge
Atopos sarasini Collinge 1902
Atopos semperi Simroth, 1891
Synonyms:Atopos leonina (Heude, 1882) is a synonym of Rathouisia leonina Heude, 1882
The predatory carnivorous slugs in the genus Atopos are found in peninsular Malaysia, Sumatra, Borneo, New Guinea, northeast Australia and, recently, Singapore.
Bornean Atopos specialising in Opisthostoma are known to tailor their approach to the size of the prey. They hold small snails with the shells aperture-upward with the front of its foot and eat their way down. Larger ones scrape away the shell to allow access through the spire. This behaviour is thought to drive the evolution of shell ornamentation in Opisthostoma.