A remarkable new genus and species of subterranean freshwater snail from a recently dried-up spring of Viesca, Coahuila, Northern Mexico

Shells of Phreatoviesca spinosa gen. nov. et sp. nov. 2, 3 holotype, specimen from both sides, UJMC 500 4, 5 paratype 1, specimen from both sides, UJMC 501 6 paratype 2, specimen with a ‘corkscrew’-like morphology, UJMC 502 7, 8 paratype 3, specimen from both sides, UJMC 503 9 paratype 4, specimen with smooth whorls and a trumpet-like aperture, UJMC 504 10, 11 paratype 5, specimen with smooth whorls, UJMC 505. Opercula 12, 13 paratype 5, specimen with smooth whorls, UJMC 505. Scale bar: 1 mm.