The longtail skate (Arhynchobatis asperrimus) is a skate and is the only member of the genus Arhynchobatis. This species was first described by Edgar Ravenswood Waite in 1909. It is found off New Zealand at depths of from on the continental shelf. Its length is from .
The New Zealand Department of Conservation has classified the longtail skate as "Data deficient" under the New Zealand Threat Classification System.