Huang and Chen (2013) separated Serognathus from the genus Dorcus by representing morphological characters and DNA analysis.

The head of a large male reaches nearly the length of its prothorax and abdomen combined.

[2] This species is widely distributed in Indonesia, the Philippines, Malaysia, Thailand, Vietnam, Laos, Myanmar, India, Japan, China, Taiwan and Korea.

[citation needed] However, most are imported for sport, decorative show, or to be kept as an exotic pet.

Hiroshi Fujita, a Japanese collector from the Mushi-sha insect shop, described over 20 new subspecies of S. titanus in his book "The Lucanid Beetles of the World".