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Hydroides norvegica
''Hydroides norvegica'' is a species of tube-forming annelid worm in the family Serpulidae. It is found on submerged rocks, shells, piles and boats in many coastal areas around the world. It is the type species of the genus ''Hydroides''.
Polychaetes, or marine bristle worms, have elongated bodies divided into many segments. Each segment may bear setae (bristles) and parapodia (paddle-like appendages). Some species live freely, either swimming, crawling or burrowing, and these are known as "errant". Others live permanently in tubes, either calcareous or parchment-like, and these are known as "sedentary".
==Description==
This serpulid worm lives inside a protective calcareous tube. The worm has about one hundred segments each bearing chitinous bristles called chaetae. There are twelve to nineteen pairs of tentacles surrounding the operculum, which looks slantingly cut. The head of the worm protrudes from the tube and is surrounded by a crown of tentacles. It looks like a low, round cup, with a fairly small mouth in the middle, and 16 small teeth or beams around the head’s edge.〔(A translation of Bishop Gunnerus’ description of the species ''Hydroides norvegicus'' with comments on his ''Serpula triquetra'' )〕 The worm grows to up to thirty millimetres long. The abdomen is red and crown is also red with white cross-bands. The operculum is either red or has two red rings. Two distinguishing features are the opercular whorl and the chaetae forming a collar.〔 The tube is white and chalky, about fifty milliimetres long and two millimetres wide. It is thin walled with many curved growth lines on the sides. The surface is smooth and often has distinct growth rings. The tube meanders irregularly over the substrate.〔(Marine Species Identification Portal )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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