Sputtergits

Sputtergits are horrific parasites of simple design. If anyone thought that the shores of Mot D'nir were safe, these worms prove them wrong. They live in the saltwater coasts, rivers, and streams of the marsh for most of their lives, but are reportedly capable of coming on land. They are range from 1-3 feet long with pale, smooth, slippery skin. They seem to have small slits near their mouth-end but their purpose is unknown (likely being used to sense prey). Their body is serpentine, getting thinner as you get to its tail. Its mouth-end is flat and circular with several rows of thin, translucent teeth that can hook into skin. They have no eyes, similar to many aquatic creatures in the region.
The most frightening aspect of sputtergits is their ability to come onto land. While they sit in the muddy water, they coil up their body like a spring. They can hold this tension for several hours. While land dwelling creatures can not see into the muddy water, they can sense the slightest changes in the light, prompting them to spring out of the water at their prey. They have been observed eating birds in this manner and often get confused when rafts pass by.
While they can effectively scoop a fist-sized chuck from their prey, they also lay eggs in this fashion. Hundreds of eggs have been observed after just one bite, but the offspring do not seem to survive if they hatch outside of water.

A Hardy Creature

Sputtergits can survive on land for several hours, usually dying from drying out rather than suffocation. Their skin is incredibly thick and they are difficult to kill. Their muscles are powerful, given their ability to withstand hours of coiling tension. Luckily, they cannot use this body strength for constriction, as it prevents the sputtergit from breathing while it maintains a chokehold.
When Abbot II came to the Marsh, she wrote that a sputtergit even managed to kill a crewmate. When he observed the stream, it lunged at him and gave a fatal wound. The entire crew refused to approach the body, as the parasite remained attached and twitched every once in a while. After several days, hundreds of eggs were observed hatching where the original wound had festered. This was one of the first hints the crew received as to Mor D'nir's horrid nature.