Hebetancylus
''Hebetancylus'' is a genus (biology), genus of small, freshwater, air-breathing limpets, Aquatic animal, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails and their allies. Anatomy These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill when they are unable to reach the surface for air. Species Species within the genus ''Hebetancylus'' include: * ''Hebetancylus excentricus'' (Morelet, 1851) * ''Hebetancylus moricandi'' (d’Orbigny, 1837) References

Planorbidae {{Planorbidae-stub ...
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Hebetancylus Excentricus
''Hebetancylus excentricus'', the excentric ancylid, is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc or micromollusc in the family Planorbidae, the ram's horn snails and their allies. Geographic distribution ''H. excentricus'' is widely distributed across North and Central America and the Caribbean. The main area of its North American range extends from Florida to Texas, but it has also been reported from scattered ponds and river backwaters along the length of the southern Atlantic Coastal Plain as far north as North Carolina. This pattern of contagious distribution suggests that the species is possibly being dispersed through the air by migratory waterfowl. Habitat and ecology ''H. excentricus'' usually occurs on rocks in fast-flowing streams and occasionally on rocks and rooted aquatic vegetation in lakes and the impounded backwaters of rivers and streams. It also occurs on submerged sticks, logs, and large items ...
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