Microtityus, Kjellesvig-Waering, 1966

de Armas, Luis F., 2020, Scorpions of Puerto Rico and its satellite islands (Scorpiones: Buthidae, Diplocentridae): an аnnotated list, key for genera, and bibliography, Euscorpius 311, pp. 1-8 : 6

Key for species of the genus Microtityus (mainly females)

1. Basal middle lamella of the pectines conspicuously enlarged in both sexes ( Fig. 12). ...................... M. vieques

– Basal middle lamella of the pectines not enlarged neither in female or male. ................................................................ 2

2. Female with pectinal basal plate wider than long, not spatulate ( Fig. 13). ............................................ M. santosi

– Female with pectinal basal plate longer than wide, distally spatulate ( Fig. 14). ...................................... M. borincanus