They are important as food and habitat for animals including insect larvae, water snails, ducks and other waterfowl, and aquatic mammals such as beavers.
22.
""'Mercuria " "'is a genus of small brackish water snails or freshwater snails with a gill and an aquatic gastropod mollusks in the family Hydrobiidae.
23.
""'Hydrobia acuta neglecta " "'is a European subspecies of small brackish water snail with a gill and an aquatic gastropod mollusk in the family Hydrobiidae.
24.
""'Caspia " "'is a genus of marine snails, brackish water snails and freshwater snails with a gill and an aquatic gastropod mollusk in the family Hydrobiidae.
25.
""'Aphaostracon " "'is a genus of very small or minute freshwater and brackish water snails that have an aquatic operculate gastropod mollusks in the family Cochliopidae.
26.
Like all air-breathing water snails, the animal has no operculum, and has only one pair of tentacles with the eye spots at the base of the tentacles.
27.
""'Heleobia " "'is a genus of small freshwater and brackish water snails with a gill and an aquatic gastropod mollusks in the family Cochliopidae and the superfamily Truncatelloidea.
28.
Kwa'al is also a " schisto village . " A third of its children have blood in their urine because of schistosomiasis, a parasitic disease transmitted by water snails.
29.
The gillaroo is characterised by these deep red spots and a " gizzard ", which is used to aid the digestion of hard food items such as water snails.
30.
The water snail is the first intermediate host in which a miracidium ( an embryonated egg discharged in stool ) goes through its developmental stages ( sporocyst, rediae and cercariae ).
