Pseudoliparis amblystomopsis

Pseudoliparis amblystomopsis, or the hadal snailfish, is a species of snailfish from hadal depths of the North Pacific Ocean.

In October 2008, a team from British and Japanese institutes discovered a shoal of P. amblystomopsis at a depth of 7,700 metres (25,300 ft) in the Japan Trench. These were, until December 2014, the deepest living fish ever recorded on film. The record has since been surpassed by another (unidentified) type of snailfish filmed at a depth of 8,145 metres (26,700 ft).