Rachias timbo is a mygalomorph spider of Argentina, named after its type locality: El Timbó, Iguazú, Misiones.[1] R. timbo differs from Brazilian Rachias species (with similar genitalia) by being smaller and having lower keels on the male embolus.
Total length of the male paratype was 16.5mm. The length of its cephalothorax was 5.95mm, and width 4.25mm; cephalic region measured 3.55mm in length, width 5.7mm. Its labium length was 0.45mm, width 1mm and they have no cuspules. Its sternum measures 3mm in length, width 2.46mm and has a thin reborder. Serrula were absent. Chelicerae: rastellum formed by strong, thick but long and attenuate setae. Its inner margin had 10 or 11 small, widely spaced teeth. Its cephalothorax and femora of legs and palpi were greenish-bluish brown; patellae and the rest of its joints were orange brown. Its abdomen was yellowish-brown with dorsal mottling.
Misiones Province.