Copelatus sociennus is a species of diving beetle. It is part of the subfamily Copelatinae in the family Dytiscidae. It was described by J. Balfour-Browne in 1952.Copelatus, Integrated Taxonomic Information System (ITIS) Report. Retrieved 8 June 2012. The species can be found on Coloane and in Seac Pai Van. It feeds on Nelumbo nucifera.
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