The new Tapinauchenius species can be distinguished from T. gigas DI CAPORIACCO, 1954 by its shorter legs, other dentition of chelicera and the front row of eyes less weakly procurved. The spermathecae differs from that of T. plumipes (C. L. KOCH, 1842) by thicker receptacula seminis which end with 5 or 6 small ovoides instead of one knob as in other species of this genus.