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Most of the roughly 1,300 species of ribbon worms are just a few millimeters wide and can be quite long—one species, Lineus longissimus, can measure up to 55 meters, or twice the average length of a blue whale.—Marina Wang, Scientific American, 19 Jan. 2026 The ribbon worms detect chemical signals from their environment to find food.—Ashley Strickland, CNN Money, 29 Oct. 2025 Tully has been compared to gastropods (slugs and snails), conodonts (an extinct group of jawless vertebrates), polychaetes (segmented marine worms), nemerteans (ribbon worms), and nectocarids (a squid-like Cambrian organism) in the ensuing decades.—Jennifer Ouellette, Ars Technica, 25 Apr. 2023 Researchers at the Downeast Institute, a marine research lab and education center, say the highest risk to these clams is predators such as the invasive green crab and milky ribbon worm, which are thriving in the Gulf of Maine’s warming waters.—Washington Post, 25 July 2021