Biomphalaria kuhniana
Biomphalaria kuhniana is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. Shell description 
All species within the family Planorbidae have sinistral shells. Distribution 
Dominica. Phylogeny 
A cladogram showing the phylogenic relationships of species within the genus Biomphalaria:

References

Biomphalaria
Gastropods described in 1883