''Sinohelicoprion'' (meaning "Chinese spiral saw" or "Chinese ''

Helicoprion ''Helicoprion'' is an Extinction, extinct genus of shark-like Chondrichthyes, cartilaginous fish in the order Eugeneodontiformes. Almost all ''Helicoprion'' Fossil, fossils consist of spirally-arranged clusters of fused teeth, called "tooth whor ...

''") is an extinct genus of helicoprinid eugeneodontid fish that lived during the late

Permian The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years, from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the s ...

and possibly the

Early Triassic The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between 251.9 Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which ...

, from 254 to 251 million years ago. It was first named and classified by H. T. Liu and M. N. Chang in 1963.

References

Agassizodontidae Permian fish of Asia {{paleo-holocephalan-stub