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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.
Annelids are considered members of the Lophotrochozoa, a super-phylum of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments. Each segment has the same sets of organs and, in most polychates, has a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly defined or absent in others, and Echiura and Sipuncula show no obvious signs of segmentation.