Talk:Chalcosoma engganensis
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A large (35-60 mm) and heavy beetle, but anything less than the other Chalcosoma species. The body is shiny black. The male has a sharp horn (directed obliquely upward and forward) on the head. On each side of pronotum there is a curved, forward directed horns. Across the head there is a short but powerful spike. This species differs from the normally developed specimens of the other Chalcosoma species in that horns are shorter, mne can look a lot like small copies of Chalcosoma moellenkampi. The female lacks these horns and spikes, and smaller.