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These are animals the Phylum Annelida, Class Polychaeta, Family Amphinomidae. Commonly they are called: Bristleworm, Fireworms; Large Scavenger Fireworms.Eurythoe complanata. Left. A Eurythoe foraging on some Caribbean sand.he scales on this worm cover the entire upper surface. Scale worms are small polychaete annelids or bristle worms that are scavengers or predators in natural marine ecosystems. They seldom exceed 2.5 cm (1 inch) long, but there are a few bigger ones.
Learn more about this article. The annelids (Phylum Annelida) are also called the segmented worms due to their segmented bodies. This group includes the most familiar of all invertebrate worms.Earthworms, freshwater worms, leeches, and marine worms are all annelids.This group is also called bristle worms because most annelids have tiny chitinous bristles called setae. The setae help terrestrial annelids grip their surroundings, and they aid aquatic forms with swimming.arthworms, freshwater worms, leeches, and marine worms are all annelids. This group is also called bristle worms because most annelids have tiny chitinous bristles called setae. The setae help terrestrial annelids grip their surroundings, and they aid aquatic forms with swimming.