Dytiscinae

Belongs within: Dytiscidae.Contains: Dytiscus, Hydaticus, Aciliini. The Dytiscinae are a large clade of diving beetles. With the exception of the basal Cybistrini, males of the Dytiscinae have the pro- and mesotarsomeres broadly expanded with ventral sucker-like setae, used to grip the female during mating. In a number of subsequent lineages, females have conversely evolved ornamented… Continue reading Dytiscinae

Hydaticus

Belongs within: Dytiscinae. Hydaticus is a cosmopolitan genus of diving beetles characterised by straight anterolateral margins on the metasternum, a stridulatory device in males consisting of a region of reticulate cells on the dorsum of the second protarsal segment and a series of pegs along the dorsal margin of the protibia, and an irregularly rugulose… Continue reading Hydaticus

Sternopriscus

Belongs within: Hydroporinae. Sternopriscus is a genus of diving beetles found in Australia and New Guinea, characterised by a small, elongate, rugose-punctate form with a prominent mesosternum and distinctly visible fourth segment on the pro- and mesotarsi. <==Sternopriscus Sharp 1882LM87 |–*S. browni Sharp 1882LM87 |–S. cervus Watts 1978LM87 |–S. hansardii (Clark 1862) [=Hydroporus hansardii; incl.… Continue reading Sternopriscus

Dytiscoidea

Belongs within: Adephaga.Contains: Noteridae, Dytiscidae. The Dytiscoidea is a clade of predatory beetles united by the possession of extensively fused mesal metacoxal walls (Ribera et al. 2002). Though all dytiscoids are found in damp habitats, advanced swimming abilities through simultaneous strokes of the hind legs are only found in species of Noteridae and Dytiscidae. Hygrobiidae… Continue reading Dytiscoidea

Dytiscidae

Belongs within: Dytiscoidea.Contains: Agabinae, Dytiscinae, Colymbetinae, Copelatinae, Hydroporinae. The Dytiscidae are the predacious diving beetles, aquatic beetles with enlarged hind legs that are moved simultaneously when swimming. They first appeared in the Early Cretaceous, where Liadytiscus cretaceus is probably the sister group of living dytiscids as indicated by its having the metacoxae rounded anteriorly but… Continue reading Dytiscidae

Ilybius

Belongs within: Agabinae. Ilybius is a genus of diving beetles in the tribe Agabini. Females of species of Ilybius have hydroporine-type genitalia and a lateral or dorsolateral carina on the gonocoxa. This carina is dentate in species related to Ilybius subaeneus; species in which the carina is not dentate were previously classified in the related… Continue reading Ilybius

Agabinae

Belongs within: Dytiscidae.Contains: Ilybius. The Agabinae is a group of diving beetles sharing the characters of an externally visible scutellum, and metatarsal claws that are equal in length. Members of the Agabini are also united by the presence of a linear series of setae at the anteroventral angle of the metafemur (secondarily lost in some… Continue reading Agabinae

Aciliini

Belongs within: Dytiscinae. The Aciliini are a clade of diving beetles, distinguished by the possession of bifid metatibial spurs, and extremely long gonocoxae with expanded and rounded apices and apicolateral margins concave (Miller 2003). Members of the Aciliini lay their eggs in cracks in wood, moss or other cryptic locations (Miller 2001). Within the Aciliini,… Continue reading Aciliini

Copelatinae

Belongs within: Dytiscidae. The Copelatinae is a speciose clade of diving beetles, most species of which are included in the genus Copelatus. Larvae, where known, are presumed solid feeders with serrated mandibles and a foregut including a crop. Characters (from Miller 2001): Metacoxal lines closely approximated medially (metacoxal lines lost in Lacconectus); spermatheca strongly reduced;… Continue reading Copelatinae

Colymbetinae

Belongs within: Dytiscidae. The Colymbetinae is a clade of diving beetles diagnosed by the presence of transverse rugae on the dorsal surface of the lateral margins of abdominal sternum two, and usually of unequal metatarsal claws in both sexes. The majority of species are included in a tribe Colymbetini, characterised by a female genital system… Continue reading Colymbetinae