Abstracto
- The identification of Eumastacidae is normally based on the study of phallic complex. However, the genus Zeromastax possesses additional characters that easily differentiate it from other eumastacids. These are ten antenomeres, spines located ventrally on the posterior femur, spur in the distal part of hind tibiae, micropterous condition and the phallic complex with subepiphallic sclerite. Two new species are described, Z. aris and Z. malavasei from the Andean region of Colombia, which show differences in external anatomy including the pronotum, shape of tegmina and coloration pattern, as well as several differences in the phallic complex.
