Spoisoreth

In contrast to its ancestor that continues living in Sagan 4's oceans, the spoisoreth no longer uses the strategy of simulating the movement of small worms in the water to capture its preys. This creature developed a more resistant shell in screw form, which it uses to bury itself slowly into the ground, expelling water with its backside and using its small arms to remove tiny rocks to open way for the body to grow. Although its ancestor was buried in the hole it excavated, sometimes a bigger creature was capable of removing and eating it. Now, with a new shell, it always remains with its head out of the hole. Part of the shell evolved to hold its soft tentacles, which reveals a long and retractable fang, capable of injecting poison into the prey, and it can hide them when the spoisoreth feels threatened, closing like a flower.

The spoisoreth's skin is very elastic, which allows great dilatation and the ingestion of creatures larger than its mouth. When perceiving the approach of prey with its five round heat sensors located around the mouth, it attacks and holds the prey with its fangs, immobilizing it; it injects the poison and slowly swallows the prey’s body whole with its mouth, digesting it slowly. Undigested materials are released by five slim canals around its mouth, while the minerals are used to strengthen its slowly growing shell and fangs.