Pseudomyrmex arcanus Ward & Branstetter, 2022: 18, figs. 5, 20 (w.) MEXICO (Michoacán). Neotropic.

Primary type information: Primary type material: holotype worker. Primary type locality: Mexico: Michoacán, 20 km S Uruapán, 880 m, 19° 14′ N 102° 03′ W, ex dead twig of vine, tropical dry forest, 28.xii.1987, PSW09293 (P. S. Ward). Primary type depository: UNAM. Primary type specimen: CASENT0863536. Secondary type information: Secondary type material: paratype workers (number not stated). Secondary type locality: same as for holotype. Secondary type depositories: CASC, CZUG, IEXA, MCZC, PSWC, UCDC, USNM.