Land gastropoda of NW. Africa: new distributional data and nomenclature*

The following represent new records for NW. Africa: Catinella arenaria (which greatly extends the known range), Vertigo antivertigo, V. pygmaea, V. moulinsiana, and Pupilla triplicata. The following species have not been previously recorded from Morocco; Oxyloma pfeifferi, Vallonia costata, Toltecia pusillum, Helicodiscus singleyanus, Zonitoides nitidus and Zonitoides arboreus. Examination of museum material suggests that there are species described from the region which may be conspecific with more widespread Palacaretic taxa for which we give new distributional records. The identities of Vertigo discbeilia, V. maresi, V. microlena, V. codia and V. briobia (Bourguignat, 1864) are discussed. The following are synonyms of more widespread species: Pupilla L’Eprevien’ [= Pupilla muscorum], Patula Marthae Ancey, 1894 [= Gittenbergia sororcula]. Nomenclatural problems regarding Helicodiscus singleyanus are pointed out.