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Abarenicola pacifica
''Abarenicola pacifica'' or the Pacific lugworm is a large species of polychaete worm found on the west coast of North America and also in Japan. The worms live out of sight in burrows under the sand and produce casts which are visible on the surface.
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==
''A. pacifica'' is a large worm growing up to fifteen centimetres in length with an elongated, segmented body which is tapered at both ends. The head has no appendages, palps or eyes but has a prostomium and evertable oesophagus. The body is divided into three regions which are sometimes differently coloured. The segments are wider than they are long and most have setae borne on parapodia. There are between four and seven pairs of oesophageal caeca, the anterior one being larger than the others. There are some capillary setae and the segments in the middle region bear up to thirteen trunk-like sets of gills which are red due to the hemoglobin circulating in the blood. The neuropodia of these segments are short and widely separated ventrally. There are no setae on the segments of the posterior region.〔(''Abarenicola pacifica'' )〕〔(Marine Biodiversity of British Columbia )〕
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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