Spitback

The Spitback is a snail-like creature that is found on the surface of the moon Hadea.

Description
Spitbacks have a strong resemblance to that of Earth snails, with a bulbous backside resembling a snail shell. They have six stubby legs for slow movement, a horizontal-opening proboscis, and a single eye.

This odd "shell" on its backside is actually a toxic sac filled with a type of toxic liquid, that the animal will use as a projectile against predators, some shots able to be shot about fifty feet away. What exactly this liquid is remains to be said.