Menzella timedrinensis gen. et sp. nov. is described from the Middle Atlas in Morocco. This description increases the known diversity of valvatiform hydrobiids (Hydrobiidae) of Morocco to ten species and eight genera, all known only from Morocco. A key

Terranigra kosovica Radoman, 1978, was known from four localities in Kosovo. The monotypic genus was described on the basis of genital morphology. We collected T. kosovica at a new locality, about 40 km from its type locality. The shell morphology, as

The threatened springsnail subgenus Alzoniella (Navarriella) in the Iberian Peninsula has been suggested to be an old and relict lineage of the family Hydrobiidae. The subgenus is represented by two morphological species, both endemic to the Pyrenees

Stygobiont and crenobiont minute gastropods representing the family Hydrobiidae (Caenogastropoda: Truncatelloidea), characterized by the valvatoid low-spired shell, were collected from one spring and four wells in Bouregreg region, NW Morocco. The shells

The fifth mass extinction event (MEE) at the Cretaceous–Palaeogene (K–Pg) boundary 66 million years ago (Ma) led to massive species loss but also triggered the diversification of higher taxa. Five models have been proposed depending on whether this diversification