Tisamenus asper

Only a few specimens of this Tisamenus species are known so far. Ignacio Bolívar mentions characteristics of both male and female in the species description, but at the end only lists measurement data for one specimen without mentioning the gender. He states the total length as 50 millimetres (2.0 in). The species is very similar to Tisamenus serratorius. In Tisamenus asper the mesopleurae are thorny. On the first segments of the abdomen there are small round tubercules. In Tisamenus serratorius there are pairs of spines directed diagonally to the side, the length of which decreases from front to back. On the head there are postorbital ridges with finer teeth at the front and coarser teeth at the back.

Bolívar names Mazarredo, Angat, in the province of Bulacan as the origin of the animals he examined. According to the label of the female syntype, this is Mount Angat. Frank H. Hennemann examined two males of this species. One of this specimens was collected on June 16, 2012, near Norzagaray in the province of Bulacan, the other in July 2004 in Minahan in the municipality of General Nakar in the province of Quezon.