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 and 4.75 cm 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.
Zopheridae is a family of beetles belonging to Tenebrionoidea. It has grown considerably in recent years as the members of two other families have been included within its circumscription; these former families are the Monommatidae and the Colydiidae, which are now both included in the Zopheridae as subfamilies or even as tribe of subfamily Zopherinae. Some authors accept up to six subfamilies here, while others merge all except the Colydiinae into the Zopherinae.
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 color, many species of Copelatus possessing visible longitudinal furrows down the dorsal side of the wings of both sexes.
Cybister, is a genus of beetle in family Dytiscidae. They are found in much of the world, including all continents except Antarctica. As of 2021 there are 96 species and 9 additional subspecies among four subgenera in the genus.
Haliplus is a genus of crawling water beetles in the family Haliplidae. There are at least 180 described species in Haliplus. They are found worldwide, except for Antarctica, living among algae and aquatic vegetation at edges of ponds, lakes, and streams. They range in size from 1.75 to 5 mm.
Neohydrocoptus is a genus of beetles in the family Noteridae, containing the following species:
Canthydrus is a genus of beetles in the family Noteridae, containing the following species:
Hydrocanthus is a genus of beetles in the family Noteridae, containing the following species:
Suphisellus is a genus of beetles in the family Noteridae.
Synchortus is a genus of beetles in the family Noteridae, containing the following species:
Suphisellus anticicollis is a species of burrowing water beetle in the subfamily Noterinae. It was described by Félix Guignot in 1950 and is found in Ecuador.
Suphisellus penthimus is a species of burrowing water beetle in the subfamily Noterinae. It was described by Félix Guignot in 1957 and is found in Brazil.
Suphisellus vacuifer is a species of burrowing water beetle in the subfamily Noterinae. It was described by Félix Guignot in 1958 and is found in Brazil.
Suphisellus remator is a species of burrowing water beetle in the subfamily Noteridae. It was described by Sharp in 1882 and is found in Argentina, Bolivia, Brazil, Chile, Paraguay and Uruguay.
Liocanthydrus nanops is a species of water beetle in the family Noteridae. It is known from Paraguay and southern Brazil.
Liocanthydrus armulatus is a species of water beetle in the family Noteridae. It is only known from the state of Bolívar, Venezuela.
Hydrocanthus oblongus is a species of burrowing water beetle in the family Noteridae. It is found in the Caribbean Sea and North America.
Suphisellus phenax is a species of burrowing water beetle in the subfamily Noterinae. It was described by Guignot in 1954.
Liocanthydrus is a genus of beetles belonging to the family Noteridae, the burrowing water beetles. The genus is Neotropical with records from Brazil, Venezuela, French Guiana, and Paraguay. It was originally established as a subgenus of the otherwise Old World genus Canthydrus.
