Nishikawa, M., H. Ikeda, K. Kubota, and T. Sota. “Taxonomic Redefinition and Natural History of the Endemic Silphid Beetle Silpha Longicornis (Coleoptera: Silphidae) of Japan, With an Analysis of Its Geographic Variation”. Zootaxa, vol. 2648, no. 1, Oct. 2010, pp. 1–31, doi:10.11646/zootaxa.2648.1.1.