Maximum depth from Ref. 83318. Inhabits deep mesopelagic and bathypelagic zones (Refs. 3682, 83943, 116105) (Ref. 429). Members of the phylum Chaetognatha are hermaphroditic. Mating behavior: A preliminary visual signaling behavior for species recognition is observed to prevent predation. Life cycle: Eggs directly develop into miniature adults (hatchlings) (Ref. 833).