Oncomelania hupensis is a species of very small tropical freshwater snail, an aquatic gastropod mollusk in the family Pomatiopsidae.
Oncomelania hupensis
Ribbed-shelled Oncomelania hupensis hupensis. The ribs on the shell and varix surrounding the aperture are clearly visible, and a pair of eyes and a pair of tentacles are also visible on the head, with a strong contour of the foot below.
Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs to major rivers. The great majority of freshwater gastropods have a shell, with very few exceptions. Some groups of snails that live in freshwater respire using gills, whereas other groups need to reach the surface to breathe air. In addition, some are amphibious and have both gills and a lung. Most feed on algae, but many are detritivores and some are filter feeders.
Bithynia tentaculata, a small freshwater gastropod in the family Bithyniidae
Pomacea insularum, an apple snail
Planorbella trivolvis, an air-breathing ramshorn snail
Family Neritidae, Neritina natalensis