Copelatus angustus is a species of diving beetle. It is part of the genus Copelatus in the subfamily Copelatinae of the family Dytiscidae. It was described by Gschwendtner in 1932.Dytiscidae Species List at Joel Hallan's Biology Catalog. Texas A&M University. Retrieved on 6 June 2012.ITIS Report. Copelatus, 112561. ITIS. Retrieved 7 June 2012.
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