''Cybister extenuans'', is a species of
predaceous diving beetle
The Dytiscidae – based on the Greek ''dytikos'' (δυτικός), "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, but a ...
found in India and Sri Lanka.
References
Dytiscidae
Insects of Sri Lanka
Beetles described in 1858
{{Dytiscidae-stub