The combtoothed lanternshark (Etmopterus decacuspidatus) is a shark of the family Etmopteridae the only specimen, and holotype, being found from the South China Sea between the Viet Nam coast and Hainan Island, at a depth of between 510 and 690 m. The holotype's length is 29 cm.
Reproduction is presumed to be ovoviviparous.