Eucteniza relata (O. Pickard-Cambridge 1895)

Eucteniza relata, the southwestern trapdoor spider, is a species of wafer-lid trapdoor spider in the family Euctenizidae. It is found in the United States and Mexico.

Eucteniza relata described by O.P.-Cambridge (1895). Synonyms (Eucteniza rex and Eucteniza stolida) described by Chamberlin (1940), Gertsch and Mulaik 1940, and Bond and Opell (2002). The holotype for Eucteniza rex was illustrated by Bond and Opell (2002). Variation (males, 6). Cl 8.07-11.53, 9.59±0.47; Cw 7.26-9.76, 8.28±0.37; STRl 4.73-5.98, 5.3±0.19; STRw 4.34-6.01, 5.06±0.26; LBw 1.18-1.56, 1.4±0.06; LBl 0.78-1.14, 0.98±0.05; leg I: 7.39-9.3, 8.24±0.28; 3.86-5.09, 4.44±0.18; 5.04-6.38, 5.41±0.22; 5.55-7.23, 6.38±0.26; 2.78-3.99, 3.34±0.18; leg IV: 7.74-9.88, 8.58±0.32; 3.98-5.15, 4.41±0.16; 5.98-7.93, 6.67±0.3; 6.47-9.02, 7.62±0.36; 3.64-5.31, 4.49±0.27; PTl 4.19-5.31, 4.64±0.16; PTw 1.87-2.25, 2.06±0.05; Bl 1.54-2.45, 1.89±0.13; TSp 4-21, 9.33±2.54; TSr 0-0, 0±0; TSrd 0-0, 0±0; Variation (females, 6). Cl 7.55-10.01, 8.61±0.45; Cw 6.39-7.94, 7.31±0.31; STRl 4.4-5.89, 4.98±0.27; STRw 4.13-5.23, 4.68±0.21; LBw 1.39-1.98, 1.62±0.11; LBl 0.96-1.39, 1.16±0.08; Leg I: 13.54-20.45, 17.11±1.23; ANTd 6-8, 7.2±0.37; PTLs 45-80, 63.6±7.02; TBs 16-36, 23.8±3.29.

Widely distributed throughout Texas and northern/central Mexico (Fig. 1).