Spinalanx Rolston & Rider, 1988

The genus can be recognized by having the abdominal sternite III without a medial spine or tubercle; the anterolateral margin of the pronotum has denticles; the pro-, meso- and metafemur with several tubercles with setae, except on the distal region; the area between the posterior margin of the pygophore and the inferior ridge broad is nearly flat; and the basal plates are irregularly convex, with their posterior margins tuberculated (Rolston & Rider 1988).