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The Pogonophora, or beard worms, are a small group of deep sea tube worm s often found growing around warm springs. The rear of the body is segmented, and together with the Vestimentifera they have recently been regarded as a family of annelids, called the Siboglinidae , though they were earlier treated as a phylum. They appear to feed primarily on symbiotic bacteria living in their mouthless bodies. Fossils are rare. The first species was dredged from the waters of what is now Indonesia in 1900.