| Acilius | |
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| Acilius sinensis | |
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| Genus: | Acilius Leach, 1817 |
Acilius is a holarctic genus of diving beetles in the family Dytiscidae and typically has a life cycle that is univoltine. [1] [2]
Despite the prevalence of some species, one species, A. duvergeri, is listed as vulnerable on the IUCN Red List. [1]
The genus Acilius contains the following 13 extant species in 2 subgenera: [3]
Subgenus Acilius:
Subgenus Homoelytrus
These three extinct species are known only from fossils: [1]
Dytiscus is a Holarctic genus of predaceous diving beetles that usually live in wetlands and ponds. There are 26 species in this genus distributed in Europe, Asia, North Africa and North and Central America. They are predators that can reduce mosquito larvae.
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.
Graphoderus is a genus of beetle in family Dytiscidae native to the Holarctic.
Megadytes is a genus of diving beetles in the family Dytiscidae. They are found in slow-moving or static freshwater habitats throughout most of the Neotropics, ranging from Florida and Mexico, through the West Indies and Central America, to South America as far south as central Argentina. The adult beetles measure 1.65–4.75 cm (0.6–1.9 in) long depending on the exact species and the largest is also the largest in the family.
Hydaticus is a genus of predatory water beetle belonging to the family Dytiscidae. Hydaticus can be found throughout most of the world. There are 150 described species and 12 subspecies in two subgenera in the genus Hydaticus.
Thermonectus is a genus of beetle in family Dytiscidae. This genus is native to the New World, and mainly from warm temperate to tropical in distribution, but one species, T. basillaris occurs as far north as southern Ontario, Canada. They inhabit a wide range of freshwater habitats with static water and are often common. They are generally about 0.8–1.5 cm (0.3–0.6 in) long and a few species from desert pools in North America have a distinct yellow-spotted pattern on a black background.
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.
Acilius sulcatus is a species of water beetle in family Dytiscidae.It is fairly large, with color variation shown throughout its range. Typically it is yellow and black.
Rhantaticus congestus is a species of beetle in the family Dytiscidae, the only species in the genus Rhantaticus. The current definition of R. congestus makes it one of the most widespread dytiscid species in the world, found throughout much of Africa, the Middle East, India, Southeast Asia, and the Philippines to Australia. However, the definition of the genus containing a single species may change as it becomes better understood.
Sandracottus is a genus of beetles in the family Dytiscidae. These aquatic beetles are found in ponds and slow streams from South Asia east to southern Japan, and south to Australia. They are generally about 1–1.5 cm (0.4–0.6 in) long and often have distinctive markings.
Tikoloshanes eretiformis is a species of beetle in the family Dytiscidae, the only species in the genus Tikoloshanes. This species has rarely been collected and is known only from South Africa and southern Mozambique.
Regimbartina pruinosa is a species of beetle in the family Dytiscidae, the only species in the genus Regimbartina. The known distribution of the species is in Cameroon, Angola, and Gabon.
Spencerhydrus is a genus of beetles in the family Dytiscidae. The genus is found only in southern Australia and contains the following two species:
Hyderodes is a genus of beetles in the family Dytiscidae, containing only these two species:
Aciliini is a tribe of predaceous diving beetles in the family Dytiscidae. There are 7 genera and at least 69 described extant species in Aciliini, along with 5 fossil species.
Acilius fraternus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.
Acilius semisulcatus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.
Acilius sylvanus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.
Acilius abbreviatus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.
Acilius confusus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.
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