Taxonomic notes on the Alvania cimex-complex in the Mediterranean Sea. Alvania cingulata (Philippi, 1836) junior synonym of Alvania mamillata Risso, 1826 (Gastropoda, Rissoidae)

The rissoid species in the complex of Alvania cimex (Linnaeus 1758) are here revised: Alvania cimex (Linnaeus 1758), Alvania mamillata Risso, 1826, and Alvania aartseni Verduin, 1986 are here considered as valid. Rissoa cingulata Philippi, 1836, after examination of historical and living material is considered as a junior synonym of Alvania mamillata. A neotype is designated to stabilize its use. It is an ecophenotype with impoverished morphology, living in very shallow waters with fluctuating oxygen, salinity, temperature, and sulfur dioxide emissions.
Alvania cimex var. depauperata Monterosato, 1877 is confirmed as a junior synonym of Alvania mamillata Risso, 1826 based on the observation of syntypes.