Hydraenidae Temporal range:Early Jurassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Staphyliniformia
Superfamily:	Staphylinoidea
Family:	Hydraenidae Mulsant, 1844
Subfamilies
HydraeninaeMulsant, 1844 OchthebiinaeC. G. Thomson, 1860 OrchymontiinaePerkins, 1997 ProsthetopinaePerkins, 1994

Hydraenidae is a family of very smallaquaticbeetles, sometimes called "Minute moss beetles", with a worldwide distribution. They are around 0.8 to 3.3 mm in length. The adults store air on the underside of the body as well as beneath theelytra which allows them to crawl underwater, often on the underside of the water surface tension, though they cannot swim. Some species have gills that effectively allow them to stay underwater indefinitely. Larvae vary from being fully terrestrial, to being aquatic at least in their earliestinstars. The diet of hydraenid larvae and adults is thought to consist of algae, spores and other plant matter. At least some hydraenid adults usestridulation to communicate. There are around 1,300 species in 42 genera.^[1]

These 56 genera belong to the family Hydraenidae:^[2][3][4]

• †ArchaeodraenaJäch and Yamamoto 2017,Burmese amber, Myanmar, Late Cretaceous (Cenomanian)
• †OchtebiitesPonomarenko 1977Abasheva Formation, Russia, Early Jurassic (Pliensbachian),Ichetuy Formation, Russia,Karabastau Formation, Kazakhstan, Late Jurassic (Oxfordian),Mogotuin Formation, Mongolia, Early Cretaceous (Aptian)

Wikispecies has information related toHydraenidae.

• Data related toHydraenidae at Wikispecies
• Hydraenidae,Identification and Ecology of Australian Freshwater Invertebrates.
• Hydraenidae at Tolweb

• Staphylinoidea
• Beetle families
• Staphylinoidea stubs

• Articles with short description
• Short description matches Wikidata
• Use dmy dates from January 2020
• Articles with 'species' microformats
• Taxonbars with 20–24 taxon IDs
• All stub articles