Astronesthes richardsoni, or Richardson's snaggletooth, is a species of small, deep sea fish in the family Stomiidae.

First described by the Cuban zoologist Felipe Poey in 1852, it was named Chauliodus richardsoni in honour of the Scottish explorer and naturalist John Richardson.

Richardson's snaggletooth is a slender, laterally-compressed fish with a short snout, a terminal, horizontal mouth and large fang-like teeth.

There are two rows of photophores (luminous spots) on each side of the underside of the fish, numerous other photophores on the head and body and a luminous patch on the edge of the preoperculum; the colour of this fish is black and the maximum standard length is 145 mm (5.7 in).

[2][3] The species is found in the mesopelagic zone of the tropical western Atlantic, the Caribbean Sea and the eastern Gulf of Mexico.