What is "xerocrassa"

Xerocrassa is a genus of small, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Hygromiidae, the hairy snails and their allies.

Some species of Xerocrassa are instead considered to belong to the subgenus Xerocrassa, within the genus Trochoidea; in those cases the species are listed under the generic name Trochoidea.