Mathew, S. M., and K. D. Prathapan. “Morphology and Taxonomic Significance of the Labrum in the Flea Beetle Genus Chaetocnema Stephens, 1831 (Coleoptera, Chrysomelidae, Galerucinae, Alticini)”. Zootaxa, vol. 5512, no. 2, Sept. 2024, pp. 185-99, doi:10.11646/zootaxa.5512.2.3.