Acanthogonatus tolhuaca

Acanthogonatus tolhuaca is a mygalomorph spider of Chile, named after its type locality: Tolhuaca, Malleco, Region IX (de la Araucania). This species differs from A. mulchen in its wider sternum, smaller size, and the spermathecae having a more pronounced notch; from A. brunneus, it differs in the uniformly coloured abdomen.

Description

 * Female: total length 23.1 mm; cephalothorax length 9.4 mm, width 7.7 mm; cephalic region length 5.8 mm, width 5.6 mm; fovea width 0.95 mm; medial ocular quadrangle length 0.72 mm, width 1.57 mm; labium length 0.82 mm, width 1.57 mm; sternum length 4.95 mm, width 3.82 mm. Its cephalic region is wide but low, while its fovea is slightly procurved, with a small posterior notch. Its labium possesses no cuspules. A serrula is present on the anterior face of the lobe. Its sternal sigilla is small and oval (less elongated than A. Mulchen). Chelicerae: rastellum is absent. The spermathecal notch is more pronounced than in A. Mulchen. The entire spider is a reddish-blackish brown colour, while the abdomen has a paler anterodorsal spot.

Distribution
Only in Malleco Province.