The Dytiscidae – based on the Greek dytikos (δυτικός), "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 live among leaf litter. The adults of most are between 1 and 2.5 cm (0.4–1.0 in) long, though much variation is seen between species. The European Dytiscus latissimus and Brazilian Megadytes ducalis are the largest, reaching up to 4.5 cm (1.8 in) and 4.75 cm (1.9 in) respectively. In contrast, the smallest is likely the Australian Limbodessus atypicali of subterranean waters, which only is about 0.9 mm (0.035 in) long. Most are dark brown, blackish, or dark olive in color with golden highlights in some subfamilies. The larvae are commonly known as water tigers due to their voracious appetite. They have short, but sharp mandibles and immediately upon biting, they deliver digestive enzymes into prey to suck their liquefied remains. The family includes more than 4,000 described species in numerous genera.
Rhithrodytes agnus is a species of beetle in family Dytiscidae. It is endemic to Portugal.
Copelatus marginipennis 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 Laporte in 1835.
Madaglymbus apicalis is a species of diving beetle. It is part of the genus Madaglymbus in the subfamily Copelatinae of the family Dytiscidae. It was described by Fairmaire in 1898. Madaglymbus apicalis is distributed along the coastlines of much of Africa.
Copelatus haemorrhoidalis 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 Régimbart in 1883.
Exocelina subjecta is a species of diving beetle. It is part of the genus Exocelina in the subfamily Copelatinae of the family Dytiscidae. It was described by David Sharp in 1882.
Copelatus celinoides 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 Guignot in 1952.
Exocelina cheesmanae is a species of diving beetle. It is part of the genus Exocelina in the subfamily Copelatinae of the family Dytiscidae. It was described by J. Balfour-Browne in 1939.
Copelatus concii 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 Billardo in 1982.
Copelatus chloroticus 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 Régimbart in 1899.
Copelatus doriae is a species of diving beetle. It is part of the genus Copelatus of the subfamily Copelatinae in the family Dytiscidae. It was described by Sharp in 1882.
Copelatus kammuriensis 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 Tamu & Tsukamoto in 1955.
Copelatus masculinus is a species of diving beetle. It is part of the genus Copelatus, which is in the subfamily Copelatinae of the family Dytiscidae. It was described by Régimbart in 1899.
Copelatus pederzanii 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 Bilardo & Rocchi in 1995.
Copelatus restrictus 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 Sharp in 1882.
Copelatus taprobanicus is a species of diving beetle endemic to Sri Lanka. It is part of the genus Copelatus in the subfamily Copelatinae of the family Dytiscidae. It was described by Wewalka & Vazirani in 1985.
Copelatus terminalis 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 Sharp in 1882.
Copelatus tenebrosus 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 Régimbart in 1880.
Copelatus togoensis is a species of diving beetle. It is part of the genus Copelatus in the subfamily Copelatinae of the family Dytiscidae.
Madaglymbus unguicularis is a species of diving beetle. It is part of the subfamily Copelatinae of the family Dytiscidae. It was described by Régimbart in 1903.
