Shells and opercula, M. midarensis sp. n. A, I Holotype MNCN 15.05/200019H B Shell, a small ditch 7 km from Midar C Shell, Selouan River D Shell, Ouzej River E Shell, Cherarba ponds F Shell, Mariouari River G Shell, Rio de Oro H Shell, Izerouan River M, N Opercula (inner, outer sides), a small ditch 7 km from Midar K, L Protoconch and detailed microsculpture of protoconch, Selouan River.

 
 
  Part of: Boulaassafer K, Ghamizi M, Delicado D (2018) The genus Mercuria Boeters, 1971 in Morocco: first molecular phylogeny of the genus and description of two new species (Caenogastropoda, Truncatelloidea, Hydrobiidae). ZooKeys 782: 95-128. https://doi.org/10.3897/zookeys.782.26797