Darby, M. “Taxonomic Review of the Genera Micridium Motschulsky, 1869 and Micridina Johnson, 1969 (Coleoptera: Ptiliidae) With Eleven New Species Including the First Records from South America and Madagascar”. Zootaxa, vol. 4242, no. 2, Mar. 2017, pp. 233–254, doi:10.11646/zootaxa.4242.2.2.