Pseudoliparis amblystomopsis

Pseudoliparis amblystomopsis, or the hadal snailfish, is a species of snailfish from the hadal zone of the Northwest Pacific Ocean,^[1] including the Kuril–Kamchatka and Japan Trenches.^[2]

Pseudoliparis amblystomopsis
Line illustration after photograph in Liney et al. (2016)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Perciformes
Suborder:	Cottoidei
Family:	Liparidae
Genus:	Pseudoliparis
Species:	P. amblystomopsis
Binomial name
Pseudoliparis amblystomopsis (Andriashev, 1955)
Synonyms[1]
Careproctus amblystomopsis Andriashev, 1955

In October 2008, a team from British and Japanese institutes discovered a shoal of Pseudoliparis amblystomopsis at a depth of about 7,700 m (25,300 ft) in the Japan Trench. These were, at the time, the deepest living fish ever recorded on film.^[3] The record was surpassed by a type of snailfish filmed at a depth of 8,145 m (26,700 ft) in December 2014,^[4] and extended in May 2017 when another snailfish was filmed at a depth of 8,178 m (26,800 ft).^[5] This deepest-water so-called ethereal snailfish remains undescribed,^[2] but a close relative found only slightly shallower in the Mariana Trench was described as Pseudoliparis swirei in late 2017.^[6][7]