Perez, K.E., Hutchins, B.T., Solis, M. & Schwartz, B.F. (2022)

New species of Pyrgulopsis Call & Pilsbry, 1886 (Mollusca: Caenogastropoda: Hydrobiidae) from two Chihuahuan Desert springs

. Zootaxa, 5213 (1), 64–74.