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The other line of symbiotic Binucleida is the [[Symbiozoa|binucleid worms]], in which the outer shell forms a segmented exoskeleton. The biggest group of binucleid worms is the [[ScutivermisScutivermida|knightworms]] (descendants of the [[Common Knightworm|common knightworm]]), which often resemble Earth's arthropods. They range from tiny crawlers to large creatures with legs, and they include two of the first fauna on land. They are mostly found around and on the western continent, Glicker. The next-biggest binucleid worm group is [[Heliovermis]] (descendants of [[Wormstem|wormstem]]), which are able to photosynthesize. They tend to have an animal-like juvenile phase and a plant-like adult phase. Heliovermes are mostly found on and around the eastern continent, Wright.