See text Apateodus (meaning "confusing tooth") is a genus of prehistoric marine ray-finned fish which was described by Woodward in 1901.

[1] Apateodus has generally been placed in the suborder Enchodontoidei alongside most other Cretaceous nektonic aulopiforms, although its affinities have long been uncertain.

[3][4] However, some authors have still placed it as an indeterminate enchodontoid, ichthyotringoid, alepisauroid, or even elsewhere in the Aulopiformes as the sister to the barracudinas, the latter two of which have been contradicted by anatomical studies.

[3][5][6][7] The following species are known:[1][2] Indeterminate remains are known from the Turonian of Canada (Kaskapau Formation of Alberta), the Albian of Russia (Belgorod), and the Cenomanian to Santonian of the United States (Greenhorn Limestone of Colorado & Iowa, Carlile Shale of Kansas, and the Niobrara Formation of South Dakota).

[12] Known by well preserved skull remains, Apateodus is estimated to be around 1 meter (3.3 ft) in length, and would have been an effective mesopredator.