Second in a series about speculative animals that imitate Tullimonstrum. Go here for more background: [link]
Here we have an estuary at the mouth of a river during the middle Carboniferous period. Several large Lepidodendron trunks have been washed out during a storm and are just starting to be colonized by hydroids, tunicates and burrowing trilobites. Said trilobites are the favored food of the Red Constellation Tully Monster (Tullimonstrum stellus), which uses its long proboscis to reach down the trilobites' burrows. Like other Tullimonstrum, the Red Constellation advertises its highly-toxic nature with bright coloring. The Broomtail-Worm (Genestacauda monstumimus) mimics this color pattern to protect it's soft, tasty body from predators while it hunts for hydroids out in the open. The "fin" and "eyestalks" of the worm are actually colorful bristles.