Diving-beetles
Guides
Adephaga
Ground and Water Beetles, adephagans
Adephaga is the second-largest suborder of beetles, comprising over 40,000 species across 10 families. The suborder includes ground beetles (Carabidae), tiger beetles, predaceous diving beetles, and whirligig beetles. Members are characterized by specialized anatomical features including visible notopleural sutures and a first abdominal sternum separated by hind coxae. The vast majority of species belong to the family Carabidae.
Agabinus
Agabinus is a genus of predaceous diving beetles (family Dytiscidae) established by Crotch in 1873. The genus contains two described species: Agabinus glabrellus and Agabinus sculpturellus. Members are found in North America and are classified within the subfamily Agabinae.
Bidessini
Bidessini is a tribe of predaceous diving beetles within the family Dytiscidae, comprising at least 40 genera and over 630 described species. Members are small to minute aquatic beetles found across diverse freshwater habitats worldwide, with notable radiations in Australia, South America, and Madagascar. The tribe includes both surface-dwelling (epigean) and subterranean (stygobitic) species, with several genera exhibiting convergent adaptations to groundwater environments.
Bidessonotus
Bidessonotus is a genus of predaceous diving beetles in the family Dytiscidae, first described by Régimbart in 1895. The genus comprises approximately 30 described species distributed primarily in the Americas, with records from North America through Central America to northern South America. These small diving beetles inhabit freshwater environments and are members of the tribe Bidessini within the subfamily Hydroporinae. The genus was revised taxonomically by Young in 1990, who described numerous new species.
Brachyvatus
Brachyvatus is a genus of diving beetles in the family Dytiscidae, first described by Zimmermann in 1919. It belongs to the tribe Bidessini within the subfamily Hydroporinae. The genus contains at least four described species distributed in South America, with records primarily from Colombia. As with other dytiscids, members are aquatic predators.
Clemnius
Clemnius is a genus of diving beetles in the family Dytiscidae, established in 2017 to accommodate species previously placed in related genera. The genus belongs to the tribe Hygrotini within the subfamily Hydroporinae. Species in this genus are small to medium-sized diving beetles adapted to aquatic habitats. The genus has been documented from Southeast Asia based on collection records.
Colymbetinae
Colymbetinae is a subfamily of predaceous diving beetles in the family Dytiscidae, containing approximately 11 genera and at least 130 described species. Members are aquatic predators found in diverse freshwater habitats across multiple continents. The subfamily includes the genera Colymbetes, Rhantus, Meladema, and others, with some species serving as indicators of wetland conservation value.
Copelatinae
copelatine diving beetles
Copelatinae is a subfamily of predaceous diving beetles (Dytiscidae) comprising seven genera: Agaporomorphus, Aglymbus, Copelatus, Exocelina, Lacconectus, Liopterus, and Madaglymbus. The genus Copelatus is the largest with approximately 470 described species worldwide, showing greatest diversity in tropical South America, Africa, and Southeast Asia. Members are predominantly aquatic, though some species have colonized highly ephemeral habitats including forest floor depressions. The subfamily exhibits remarkable morphological diversity and includes phylogenetically isolated lineages such as the South African genus Capelatus.
Desmopachria
Desmopachria is a genus of predaceous diving beetles in the family Dytiscidae, tribe Hyphydrini. The genus contains over 80 described species distributed primarily in the Americas, from the United States through Central America to South America, with particular diversity in the Amazon basin and Caribbean islands. Species are associated with aquatic habitats including river floodplains and high-altitude forest streams. Multiple new species have been described in recent decades, indicating ongoing taxonomic work and likely remaining undescribed diversity.
Hydaticini
Hydaticini is a tribe of diving beetles (family Dytiscidae, subfamily Dytiscinae) established by Sharp in 1880. Members of this tribe are aquatic predators found in freshwater habitats. The tribe includes the genus Hydaticus, with species documented from the Neotropics including the Amazon basin and Brazilian highlands.
Hydrodytinae
Hydrodytinae is a subfamily of predaceous diving beetles in the family Dytiscidae, established by K. B. Miller in 2001. It contains at least two genera and four described species. The genus Hydrodytes occurs in North America and the Neotropics, while Microhydrodytes is restricted to the Neotropics. This subfamily represents a relatively recently recognized lineage within the diverse diving beetle fauna.
Hydroporinae
Hydroporinae is a large subfamily of predaceous diving beetles (family Dytiscidae) containing at least 2,200 described species. Members are primarily aquatic, inhabiting diverse freshwater habitats from lentic pools to lotic streams across all continents except Antarctica. The subfamily exhibits remarkable diversity in body size, with some species among the smallest diving beetles known. Many species are habitat specialists, including stygobiont forms adapted to subterranean waters.
Hydroporini
Hydroporini is a tribe of predaceous diving beetles in the family Dytiscidae, containing at least 730 described species. Members are primarily aquatic, inhabiting freshwater environments including streams, rivers, and groundwater systems. The tribe exhibits a broad geographic distribution spanning Australia, New Guinea, Europe, and other regions, with notable diversity hotspots in south-western Australia.
Hydroporus
Hydroporus is a genus of small diving beetles (family Dytiscidae) with approximately 180 described species worldwide. The genus exhibits substantial morphological diversity organized into multiple species groups, including the longiusculus-group, longulus-group, memnonius-group, and nigellus-group. Members occur across the Palearctic, Nearctic, Near East, and North Africa. Several species complexes within the genus show convergent adaptations to specialized habitats, including semi-subterranean environments.
Hygrotini
Hygrotini is a tribe of small diving beetles in the subfamily Hydroporinae. The tribe contains approximately 137 species, most of which inhabit freshwater environments. Multiple lineages have independently evolved tolerance to saline and hypersaline conditions, with some species surviving in concentrations more than double that of seawater.
Metaxydytes
Metaxydytes is a genus of predaceous diving beetles in the subfamily Cybistrinae, endemic to the Neotropics. The genus comprises nine species that were reclassified from the genus Megadytes based on phylogenetic and morphological evidence. These are large aquatic beetles adapted to freshwater habitats. The genus was established to accommodate species previously considered part of a broader Megadytes concept.
Nebrioporus
Nebrioporus is a genus of diving beetles (Dytiscidae) established by Régimbart in 1906. The genus has been divided into eight species-groups based on morphological character analysis, replacing historical subgeneric divisions. It contains numerous species distributed across Europe, North Africa, the Middle East, and Asia, with the N. depressus-group being the most speciose.
Neoclypeodytes
Neoclypeodytes is a genus of small diving beetles in the family Dytiscidae, tribe Bidessini, distributed across western North America and northern Central America. The genus was revised in 2001, with 25 valid species recognized and 11 new species described. A single synapomorphy—two maculae on each elytron—supports its monophyly. Relationships to other bidessine genera remain unresolved.
Vatellus
Vatellus is a genus of predaceous diving beetles in the family Dytiscidae, tribe Vatellini. The genus contains 15 described species distributed primarily in the Neotropical region, with most species described by K.B. Miller in 2005. Members are aquatic beetles adapted to freshwater habitats.