Bahder, B.W., Barrantes, E.A.B., Echavarria, M.A.Z., Mou, D.-F., Helmick, E.E. and Bartlett, C.R. 2020. A  new species of planthopper in the genus Haplaxius (Hemiptera: Auchenorrhyncha: Fulgoroidea: Cixiidae) on palms in Costa Rica and a new country record for Haplaxius skarphion. Zootaxa. 4767, 4 (Apr. 2020), 543–552. DOI:https://doi.org/10.11646/zootaxa.4767.4.4.