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

Figures 16-23 - Head, full-face view, and pronotum, dorsal view, of Bolboceras: 16–19 Bolboceras inaequale (16–17 major specimen from Kolkata 18–19 minor specimen from Dhanjuri) 20–21 duplicatum,holotype 22–23 orissicum,holotype. Scale lines 1 mm.