''Ankistrorhynchus'' is an extinct genus of sclerorhynchoid from the

Cretaceous Period The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geologi ...

. It is known only isolated rostral teeth from two species. ''A. lonzeensis'' is named for its type locality of Lonzée, Belgium. It is from the lower

Santonian stage The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya (million years ago) and 83.6 ± 0.7 mya. The ...

. ''A. washakiensis'' was described from the

Campanian The Campanian is the fifth of six ages of the Late Cretaceous epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campa ...

-aged

Mesaverde Formation History The Mesaverde Formation was first described by William Henry Holmes, W.H.Holmes in 1877 during the Hayden Survey. Holmes described the formation in the northern San Juan Basin as consisting of three units, which were a "Lower Escarpment ...

of Wyoming, USA. The species ''A. major'' was named from Campanian/Santonian of

New Jersey, USA New Jersey is a state located in both the Mid-Atlantic and Northeastern regions of the United States. Located at the geographic hub of the heavily urbanized Northeast megalopolis, it is bordered to the northwest, north, and northeast b ...

off of fragmentary material, thus making its validity questionable.

References

Sclerorhynchoidei Fossil taxa described in 1964 Prehistoric cartilaginous fish genera {{paleo-rajiformes-stub