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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.
The Annelida and Arthropoda phyla share membership in the broader Animalia category, or kingdom, that includes all animals. From that similarity, however, they go in separate directions. Arthropods and annelids are different types of organisms.The Annelida phylum includes most worms, while the diverse Arthropoda phylum counts arachnids, lobsters and insects among its members.ne difference between Annelid and Arthropod phyla is their diversity. The Annelid phylum contains three classes of organisms: Polychaeta, Oligochaeta and Hirudinea. The first two classes consist of worms differentiated primarily by the use of parapodia for movement; the third includes leeches.