Astrin, J. J., & Stüben, P. E. (2009). Molecular phylogeny in ’nano-weevils’: description of a new subgenus Nanoacalles and two new species of Calacalles from the Macaronesian Islands (Curculionidae: Cryptorhynchinae). Zootaxa, 2300(1), 51–67. https://doi.org/10.11646/zootaxa.2300.1.4