Figures 16-23 from: (2013) Distinguishing Bolboceras inaequale Westwood, 1848 and two new relatives from India (Coleoptera, Geotrupidae, Bolboceratinae). ZooKeys 276: 55-66. https://doi.org/10.3897/zookeys.276.4786 - Krikken, Jan (2013)