Sliquifier

Sliquifiers are a tidal class dragon. They were first mentioned in dragonpedia but their first appearence was on Rise of Berk.

Description
This supersonic swimmer is among the fastest in the tidal class. So loyal and trustworthy it may even let a rider sit in its mouth... without eating him. The Sliquifiers look like fish combined with a Tide Glider with legs and might be hunted by Scauldrons.

Trivia

 * In the How to Train Your Dragon 2 website, it is said that the Scauldrons hunted Sliquifers down to near-extinction.
 * Said text has now been removed from the Scauldron's dragonpedia page. The word Sliquifiers has been replaced by the phrase smaller species.