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Natural populations of these snails are usually found in tropical standing water or freshwater in South America and Africa, but they also reach 30° latitude in subtropical areas. Many species of these red-blooded planorbid snails (Gastropoda: Basommatophora) are able to survive a long time when removed from their freshwater habitat.
The Neritimorpha are a group of primitive "prosobranch" gilled snails which have a shelly operculum.. Neritiliidae - 5 extant freshwater species [5]; Neritidae - largely confined to the tropics, also the rivers of Europe, family includes the marine "nerites". [9]
Bulinus truncatus is a species of air-breathing freshwater snail with a sinistral shell, an aquatic pulmonate gastropod mollusk in the subfamily Bulininae of the family Bulinidae, the ram's horn snails and the like. [3] Subspecies. Bulinus truncatus contortus (Michaud, 1829) (synonym: Physa contorta Michaud, 1829) Bulinus truncatus rivularis ...
Bulinus is a genus of small tropical freshwater snails, aquatic gastropod mollusks in the family Bulinidae, the ramshorn snails and their allies. [ 5 ] This genus is medically important because several species of Bulinus function as intermediate hosts for the schistosomiasis blood fluke .
Physella acuta is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic gastropod mollusk in the family Physidae. Common names include European physa , tadpole snail , bladder snail , and acute bladder snail .
Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha. [2] Their minute shell is often colored. They are characterized by a calcareous operculum, a lobe on the upper surface of the neck. The ctenidium, the respiratory gill-comb, is very broad. They have a ciliary feeding habit.
Shells of the freshwater snail Theodoxus danubialis Shells of the land snail species Helicina rostrata Titiscania, a shellless neritimorph. Despite their relatively low diversity, with only around 2,000 species, neritomorphs have achieved a remarkable diversity of forms, resembling a smaller-scale version of the diversity achieved by Gastropoda as a whole. [3]
These freshwater limpets are capable of secreting a bioluminescent substance when disturbed. [6] Theories vary as to the purpose of the bioluminescence, but indicate it is a defence mechanism. One theory is that when disturbed by a predator, Latia release the bioluminescent slime, and the predator chases the light rather than the snail.