See text Aegus is a genus of stag beetles in the family Lucanidae.

Comprising about 260 species in the genus, they are placed in the largest subfamily Lucaninae.

[2][3] They are distributed in South Asia, Southeast Asia and the Pacific countries, but introduced accidentally to many parts of the islands.

[4][5] Primarily saproxylic, adult beetles and grubs are commonly found in decaying wood and stumps with abundant fungal growth.

[6] The species show dramatic external intraspecific variation resulting from sexual dimorphism and male polymorphism.