''Copelatus aemulus'' is a species of

diving beetle The Dytiscidae, from the Ancient Greek word δυτικός (''dystikos''), meaning "able to dive", are the predaceous diving beetles, a Family (biology), family of water beetles. They occur in virtually any freshwater habitat around the world, bu ...

. It is part of the genus ''

Copelatus ''Copelatus'' is a large genus of small diving beetles. There are some 470 described species in the genus, found worldwide, but they are most diverse in tropical South America, Africa and South-East Asia. Copelatus are often black or brown in co ...

'' in the subfamily

Copelatinae Copelatini is a tribe of diving beetles in the family Dytiscidae. It is the sole tribe in the subfamily Copelatinae. The largest genus within the tribe is ''Copelatus'', which has about 470 described species found worldwide, but most diverse in t ...

of the family

Dytiscidae The Dytiscidae, from the Ancient Greek word δυτικός (''dystikos''), meaning "able to dive", are the predaceous diving beetles, a family of water beetles. They occur in virtually any freshwater habitat around the world, but a few species l ...

. It was described by Bilardo & Rocchi in 1995.Dytiscidae Species List
at Joel Hallan's Biology Catalog. Texas A&M University. Retrieved on 6 June 2012.

References

aemulus Beetles described in 1995 {{Copelatus-stub