Coguchi

Coguchi are an extinct species of aquatic predator that once existed on PNF-404.

Description
The Coguichi is a fish-like predator. It is iconic for its elongated mouth, giving it a resemblance to Earth's swordfish or Gar, and as such possibly hunted in a similar method to them. It is hypothesized that it evolved its elongated mouth as a better means to capture small prey, but in contrast the longer mouth made it less streamlined, and as such a slower swimmer.

It only has one living relative, being the Puckering Blinnow, as such it is placed within the same family group as the first extinct species to be discovered in said group.