Abstract
The purpose of the article is to assess the biodiversity of gutless marine worms of the family Siboglinidae (Annelida), whose metabolism is provided by symbiotic bacteria that oxidize hydrogen sulfide and methane. Within the geographical boundaries of the Laptev Sea, 7 species of siboglinids were found, another 1 species was found in the adjacent sector of the Arctic basin. The largest number of finds and the greatest biological diversity of siboglinids were found in the eastern part of the Laptev Sea in the field of numerous methane. One find was noted in the estuary area of the Lena River at a depth of 25 m. The possible connection of siboglinids with methane seepage areas is discussed.
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