Pupilla bigranata

Pupilla bigranata is a nomen dubium that was used for some forms of the land snails Pupilla triplicata and Pupilla muscorum (Pupillidae), but none of these forms represent a separate species, therefore such species as Pupilla bigranata does not exist.^[2]

Pupilla pratensis
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Pupillidae
Genus:	Pupilla
Species:	P. bigranata
Binomial name
Pupilla bigranata (Rossmässler, 1839)[1]
Synonyms
Pupa bigranata Rossmässler, 1839

Considering that in the original Rossmässler's description the type locality was not indicated and that type specimens are not preserved, it is not possible to determine whether Pupa bigranata Rossmässler, 1839 is synonym of Pupilla triplicata or Pupilla muscorum.