Leptopoma undatum is readily distinguished from the others by its uniform white shell (translucent when young and opaque when old) and distinctive shell shape (i.e., relatively less convex whorls and sharply keeled at the last whorl).

The other three species, Leptopoma atricapillum, L. sericatum and L. pellucidum, are very similar in terms of shell shape with all showing and sharing colour pattern polymorphism. L. atricapillum and L. sericatum, however have strongly-defined spiral ridges on the shell surface, with more pronounced spiral ridges in the former, whereas the spiral ridges of L. pellucidum are only weakly defined.

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