Tayshaneta fawcetti Ledford, Paquin, Cokendolpher, Campbell & Griswold 2012

Male (holotype). Body length 1.56, carapace 0.67 long, 0.58 wide, length 1.15× width. Carapace pale brown, slightly darker surrounding edges, sparsely setose; eyes reduced, ocular area depigmented (Figs 19A–C). Legs elongate and thin, femur I 1.83× carapace length, covered in fine setae and with few scattered spines.Palpal tarsus divided apically (Fig. 31D); retrolateral tibial spine smooth at its base (RTS, Fig. 40D), length 0.38× tarsus width. Bulb suboval, length 1.8× width; embolus rectangular, with basal tooth (E, Fig. 40F), length 1.25× width. Ventral sclerite stout, situated mesoapically (VS, Fig. 40E), retrolateral sclerite pocket-like, weakly invaginated (RS, Figs 40E, F).Abdomen pale brown, without pattern, 0.89 long, 0.67 wide, covered in fine setae. Variation (n = 2). Total length 1.50–1.56; carapace length 1.15–1.2 × carapace width; length femur I 1.72–1.83 × carapace width. Female (Fawcett’s Cave).Body length 1.4, carapace 0.60 long, 0.50 wide, length 1.17× width. Pigmentation and setation same as for male, except ocular area with a faint dark pattern enclosing the AER (Figs 19D–F). Legs elongate and thin, femur I 1.6× carapace length, covered in fine setae and with few scattered spines.Atrium trapezoidal, length 0.73× width, spermathecae with short twisted stalks and elongate heads (Fig. 53C).Abdomen pale brown, without pattern, 0.80 long, 0.58 wide, covered in fine setae. Variation (n = 2). Total length 1.25–1.40; carapace length 1.20–1.52 × carapace width; length femur I 1.0–1.4 × carapace width.

Known only from Fawcett’s Cave in the Devil’s River State Natural Area, Val Verde County, Texas (Fig. 60).