Water-scavenger-beetles
Guides
Berosini
Berosini is a tribe of water scavenger beetles (Hydrophilidae: Hydrophilinae) comprising 364 species in five genera: Allocotocerus, Berosus, Derallus, Hemiosus, and Regimbartia. The tribe exhibits significant larval ecological diversification, with evolutionary shifts between benthic and cryptic habitats documented. Phylogenetic analysis supports two major clades: one containing Hemiosus and Berosus, and another containing Derallus, Regimbartia, and Allocotocerus.
Chaetarthria
Chaetarthria is a genus of water scavenger beetles in the family Hydrophilidae, first described by Stephens in 1835. The genus contains at least 27 described species. These beetles are placed in the subfamily Chaetarthriinae and tribe Chaetarthriini. They are small aquatic beetles associated with freshwater habitats.
Coelostomatini
Coelostomatini is a tribe of water scavenger beetles within the family Hydrophilidae, containing approximately 7 genera and more than 70 described species. The tribe was established by Heyden in 1891. Members of this tribe are classified in the subfamily Sphaeridiinae and share morphological characteristics typical of this group, including compact body forms. The tribe includes genera such as Coelostoma, Dactylosternum, and Pelosoma, which are distributed across various regions globally.
Crenitulus
Crenitulus is a genus of small water scavenger beetles in the family Hydrophilidae, tribe Anacaenini. The genus was established by Winters in 1926 and is part of the subfamily Chaetarthriinae. Members of this genus are aquatic or semi-aquatic beetles associated with freshwater habitats. The genus is poorly documented in the scientific literature, with limited species-level information available.
Cymbiodyta
Cymbiodyta is a genus of water scavenger beetles (Hydrophilidae: Enochrinae) comprising 31 described species. The genus exhibits a strikingly disjunct distribution: 28 species occur in the Americas, while only three species inhabit the Palearctic region. A fossil species from Eocene Baltic amber (C. samueli) confirms the genus has persisted in Europe since at least the Eocene, supporting biogeographic reconstructions indicating an ancient Euro-American distribution dating to the Late Cretaceous when land connections existed between North America and Europe.
Dactylosternum
Dactylosternum is a genus of water scavenger beetles in the family Hydrophilidae, containing more than 20 described species. Species occupy diverse microhabitats including fungal hyphae on fallen wood, decaying wood associated with termites, and living plant tissues such as banana trees. The genus exhibits morphological variation correlated with lifestyle: species living inside plant tissues possess a compact antennal club and parallel-sided body form, while free-living species have a loose antennal club and rounded body form.
Didactyliini
Didactyliini is a small tribe of water scavenger beetles within the family Hydrophilidae, currently containing the single genus Didactylus. Members of this tribe are aquatic beetles distinguished by reduced tarsal segmentation, with only two visible tarsomeres on the fore and mid legs. The tribe was established to accommodate this unusual morphological condition, which separates it from other Hydrophilinae. The genus occurs in the Neotropical region, where species inhabit freshwater environments.
Hydrochidae
Elongate Water Scavenger Beetles
Hydrochidae is a family of aquatic beetles in the order Coleoptera, containing a single genus Hydrochus with approximately 180–200+ species worldwide. These small elongate water scavenger beetles are found in freshwater habitats across multiple continents including Europe, Asia, Africa, and the Americas. The family is sometimes treated as the subfamily Hydrochinae within Hydrophilidae. Species-level taxonomy is well-developed, with recent revisions documenting substantial diversity in Central America (26 species), South America (77 species in Bolivia, Brazil, and Paraguay alone), and the Mediterranean region.
Hydrophilinae
water scavenger beetles
Hydrophilinae is the largest subfamily of water scavenger beetles (family Hydrophilidae), containing approximately 1852 species in 61 genera and 8 tribes. The subfamily was revised by Short and Fikáček in 2013, which recognized five tribes: Amphiopini, Berosini, Hydrobiusini, Hydrophilini, and Laccobiini. Members are predominantly aquatic beetles found across diverse geographic regions including the Neotropics and Asia. Some genera represent ancient, possibly relict lineages with unusual morphological character combinations.
Hydrophilus
Giant Water Scavenger Beetles
Hydrophilus is a genus of large aquatic beetles in the family Hydrophilidae, commonly known as giant water scavenger beetles. The genus comprises approximately 48 species arranged in three subgenera: Hydrophilus, Dibolocelus, and Temnopterus. These beetles are among the largest aquatic insects in their range, with some species reaching substantial size. Members of this genus are fully aquatic as adults, possess the ability to disperse by flight, and exhibit distinct feeding mode shifts during development—carnivorous larvae transition to omnivorous adults. Several species are rare or endangered in parts of their range, including the great silver water beetle Hydrophilus piceus in Britain.
Laccobiini
Laccobiini is a tribe of aquatic beetles within the family Hydrophilidae, containing 367 species distributed across 8 genera. Members are small to minute water scavenger beetles occupying diverse freshwater habitats across multiple continents. The tribe includes the well-known genus Laccobius and the hygropetric-specialist genus Oocyclus.
Laccobius
water scavenger beetles
Laccobius is a diverse genus of water scavenger beetles in the family Hydrophilidae, with more than 80 described species worldwide. Species are classified into several subgenera including Microlaccobius, Hydroxenus, Glyptolaccobius, and Dimorpholaccobius. They are found across multiple continents including Europe, Asia, Africa, and North America, inhabiting a variety of freshwater marginal habitats.
Novochares
water scavenger beetles
Novochares is a genus of water scavenger beetles (Hydrophilidae: Acidocerinae) erected in 2021 to accommodate New World species previously placed in Helochares. The genus contains 52 described species distributed across the entire Neotropical region from Mexico to Argentina, including Caribbean islands. Species circumscription relies heavily on male aedeagus morphology due to relatively homogeneous external characteristics. An integrative taxonomic approach combining adult morphology with COI and 28S DNA sequence data was used to delimit species boundaries.
Sperchopsis
Sperchopsis is a genus of water scavenger beetles in the family Hydrophilidae. The genus was established by LeConte in 1861. It contains a single described species, Sperchopsis tessellata.