Jordal, B. H. “Two New Species of Aphanarthrum Wollaston (Coleoptera: Curculionidae, Scolytinae) Associated With Euphorbia In South Africa”. Zootaxa, vol. 1983, no. 1, Jan. 2009, pp. 54–62, doi:10.11646/zootaxa.1983.1.4.