|Pomacea bridgesii in aquarium|
informal group Architaenioglossa
- See also: Pomacea diffusa, formerly known as Pomacea bridgesii.
Pomacea bridgesii, common names the spike-topped apple snail or mystery snail, is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae.
- Pomacea bridgesii bridgesii (Reeve, 1856)
- Pomacea bridgesii diffusa (Blume, 1957)
Mystery snails possess structurally complex eyes at the tip of a cephalic eyestalk. These snails possess the ability to regenerate the eye completely after amputation through the mid-eyestalk. They are born with both gills and lungs. 
This species is non-indigenous in Hawaii since 1960 (Pomacea bridgesii diffusa), southeast Asia since 1980s, and Florida since the early 1980s (Pomacea bridgesii diffusa).
Mystery snails lay their eggs above the water line. The eggs take 2–4 weeks to hatch. The snails can have as many as two-hundred offspring from one egg-laying event.
This species is often kept as an aquarium pet, because of its wide range of shell colors, lack of appetite for live plants, and ease of care.