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Polychaete species are widely distributed throughout Indo-Pacific and European waters. We collected  Metasychis  specimens from the China Seas to report on  Metasychis varicollaris  sp. n. and  Metasychis gotoi  ( Izuka, 1902 ) in greater detail. Geographic analysis of the potential distribution areas of  M. gotoi  indicates that it may be found in most coastal areas of China. The newly discovered species,  M. varicollaris  and  M. gotoi , have an overlapping distribution in the northern South China Sea.  Metasychis varicollaris  sp. n. is characterized by a crenulated cephalic rim, complete collar on chaetiger 1, a packet-shaped anal funnel, and a spirally-fringed notochaetae with spiral pectinate bands imbricated over the main shaft. Our study provides a taxonomic key to all species of  Metasychis .

Metasychis varicollarissp. nov. and report ofMetasychis gotoi(Maldanidae, Annelida) from the China Seas