Tityus (Archaeotityus) mraceki sp. n. from Colombia is described. It differs from other species of the subgenus Archaeotityus by unique sexual dimorphism expressed in the male having a longer metasoma and a narrower chela of the pedipalp. The synonymization of T. meridanus González-Sponga, 1981 with T. nematochirus Mello-Leitão, 1941 is based on morphological and color variation present in a single litter consisting of 33 individuals.
Kovařík, F. 2007 . Description of Tityus mraceki sp. n. from Colombia and Synonymization of T. meridanus González-Sponga with T. nematochirus Mello-Leitão (Scorpiones: Buthidae). Euscorpius, No. 54: 1-7.