Astrin, Jonas J., and Peter E. Stüben. 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). Auckland, New Zealand:51–67. https://doi.org/10.11646/zootaxa.2300.1.4.