The blacktailed spurdog (Squalus melanurus) is a dogfish, a member of the family Squalidae, found around New Caledonia in the central Pacific Ocean, at depths from 320 to 320 m. Its length is up to 75 cm.

The 1 mm-long monogenean Triloculotrema chisholmae has been described in 2009 from three specimens found in the nasal tissue of a single shark caught off New Caledonia.

[3] Species of Triloculotrema appear to be limited to deep-sea sharks, either triakids or squalids (possibly etmopterids).

[2] The blacktailed spurdog is also the host of external parasites such as the aegid isopod Aega angustata on the skin.

[4] Internal parasites include several trypanorhynch cestodes in the spiral intestine, such as Vittirhynchus squali and Gilquinia sp.