Sloane's viperfish, Chauliodus sloani, is a predatory mesopelagic dragonfish found in waters across the world.[3] The species was first described by German scientists Marcus Elieser Bloch and Johann Gottlob Schneider in their 1801 book Systema ichthyologiae: iconibus CX illustratum, volume 1.[4] Female C. sloani reach maturity between 133 and 191 mm, while males likely reach maturity at slightly smaller body lengths.[5] It has two rows of photophores along its ventral side.[6] It is believed that C. sloani can adjust the intensity of bioluminescence of the ventral photophores to camouflage itself from predators that might see its shadow from below.[7]