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Figures 1–8.Oblique and lateral habitus views of Bolboceras: 1–4 Bolboceras inaequale (1–2 major specimen from Kolkata, length 11 mm 3–4 minor specimen from Dhanjuri, length 9 mm) 5–6 duplicatum, holotype 7–8 orissicum, holotype. Scale lines 1 mm.
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Figures 9–15.Forebody and aedeagus of Bolboceras: 9–12 head and pronotum, frontodorsal view 9–10 Bolboceras inaequale (9 major specimen from Kolkata 10 minor specimen from Dhanjuri) 11 duplicatum,holotype 12 orissicum,holotype 13–15 aedeagus, upper side view, of 13 Bolboceras inaequale,major specimen from Kolkata 14 orissicum,holotype 15 duplicatum,holotype. Scale lines 1 mm.
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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.