Atrichonotus Buchanan was revised by Lanteri & O'Brien (1990) and currently includes six small species native to South America, one of them, A. pacificus Kuschel, endemic to Chile.
A. convexifrons is distinguished from other species of this genus by a typical color pattern of brown scales and the presence of long, erect setae on the odd-numbered intervals of the elytra. It is flightless and the absence of males in its populations suggests that reproduces by parthenogenesis (Lanteri & Normark 1995).
Secale cereale (L.) M Bieb. (Poaceae) (Lanteri et al. 2002a).
Mainly associated with gramineous plants of the Pampean biogeographic province.