Schulze, Anja Department of Marine Biology, Texas A&M University, Galveston, Texas.
Last reviewed:April 2019
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A taxon of tube-dwelling marine worms, commonly known as beard worms. Members of the taxon Siboglinidae (siboglinids) comprise an unusual group of worms (Fig. 1). They depend on symbiotic bacteria for nutrition and occur mostly below depths of 100 m (328 ft) in reducing habitats, such as hydrothermal vents, cold seeps, wood falls, and whale bones. Siboglinidae was long considered to be a distinct phylum named Pogonophora, but modern-day genetic data, combined with evidence from embryonic and larval development, show that siboglinids belong to the phylum Annelida, or segmented worms. See also: Annelida; Bacteria; Deep-sea fauna; Hydrothermal vent; Marine ecology
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