Dorcus titanus, also known as the Giant Stag Beetle, is a beetle of the family Lucanidae. It was described by Boisduval in 1835. In the research of Huang & Chen(2013), Serognathus has separated from Dorcus, showing the morphological and DNA analysi Males measure 32.0–111.3 millimetres (1.26–4.38 in) including mandibles; females 36.5–54 millimetres (1.44–2.13 in). It has an elongated, somewhat flat body dull black with blackish antennae and legs. Male’s antler-like jaws have small teeth along inner edge and a pair of big teeth toward the bottom, and are forked at end. Head of a large male reaches nearly the length of its prothorax and