About Aegus chelifer Macleay, 1819
This species, Aegus chelifer Macleay, 1819, has a body length ranging from approximately 15.0 to 39.5 mm. It exhibits substantial intraspecific variation in body size, and males can be split into two morphs classified by mandible size: minor and major morphs. It is a widespread stag beetle species native to extensive areas of the Indo-Malayan regions west of Wallace's Line, including India, Bangladesh, Sri Lanka, the Andaman and Nicobar Islands, Myanmar, Thailand, Singapore, Laos, Vietnam, Cambodia, the Malayan Peninsula, Sumatra, and Borneo. Recently, the species has been discovered as an introduced species in the Seychelles and Madagascar. The primary cause of this introduction is thought to be the dispersal of large numbers of floating tree trunks from Southeast Asian coastal forests, which were carried westward by the South Equatorial Current during the 2004 Indian Ocean earthquake and tsunami.
