What is the scientific name of the Mariana snailfish?

The scientific name of the Mariana snailfish is Pseudoliparis swirei.

This small hadal snailfish was formally described in 2017 after researchers examined specimens collected from the Mariana Trench. Its known range is roughly 6,198 to 8,076 metres, placing it among the deepest-living fish known to science.

The species name swirei honours Herbert Swire, a midshipman and later author associated with the 19th-century Challenger Expedition. Pseudoliparis belongs to the snailfish family Liparidae, whose members often have soft bodies and adaptations for extreme pressure.

It is sometimes confused with the unidentified juvenile snailfish filmed deeper in the Izu–Ogasawara Trench in 2022. That animal belongs to the genus Pseudoliparis, but it was not established as P. swirei.