Filetail Catshark
Parmaturus xaniurus
- Least concern
- Card rarity: Common
- Sharks and rays

The filetail catshark is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This species is an Eastern Pacific endemic deepwater catshark ranging along the west coast of North America from Washington to the Gulf of California. Its name refers to the toothlike projections on its skin. Nothing was known of its abundance or population structure as of 2003, but it was reported to be fairly common, being one of the most commonly encountered cartilaginous fishes in the annual West Coast Groundfish Bottom Trawl Survey from 2003 to 2011.
Classification
- Class
- Chondrichthyes
- Order
- Carcharhiniformes
- Family
- Pentanchidae
- Genus
- Parmaturus