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Unidentified Figulus and Nigidius species

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Figulus sp. Figulus sp. Figulus sp.

Nigidius sp. Nigidius sp. Nigidius sp.

Lucanidae in my collection is one of the least identified specimens. Of course, those in the genus Dorcus, Cyclommatus, to mention a few, are more known than, say, those of genera Figulus and Nigidius in subfamily Figulinae. I just don’t have the relevant papers and these species are quite challenging as all almost look the same except for the sculptural differences of the head. If I only have those identification keys and other important information.