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Family Hydraenidae - Minute Moss Beetles

Minute Moss Beetle - Hydraena Minute Moss Beetle - Hydraena Hydraena circulata Perkins - Hydraena circulata Ochthebius sp?  Hydraenidae, Rincon Mountains - Hydraena Hydraena arizonica? - Hydraena Hydraena pensylvanica - male Hydraena
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Staphyliniformia)
Superfamily Staphylinoidea (Rove, Carrion and Fungus Beetles)
Family Hydraenidae (Minute Moss Beetles)
Synonyms and other taxonomic changes
used to be grouped with the Hydrophilidae(1)
Explanation of Names
Hydraenidae Mulsant 1844
Numbers
~70 spp. in 6 genera of 2 subfamilies in our area, 210 spp. in the New World, ~1400 described spp. (+hundreds undescribed) in >40 genera worldwide(1)(2)(3)(4)(5)(6)(7) (the cosmopolitan Hydraena alone includes ~900 described spp.)
not yet in the guide: Enicocerus (regarded as subgenus of Ochthebius by some workers)
Size
0.5-3.0 mm(1)
Identification
key to most NA species in (2); FL spp. in(8)
Range
worldwide(1)
Habitat
in moss or accumulations of moist/wet dead leaves and sticks/twigs along the margins of streams, rivers, sinkholes, pools and ponds; also in littoral zone substrata(8)
Food
Larvae and adults graze on wet stones, sand grains and plant matter, where they feed on algae, bacteria, protozoans and detritus(8)
Remarks
Some of the oldest beetle fossils are hydraenids, from the lower Jurassic(1)
See Also
The antennal club of 5 antennomeres (vs normally 3 antennomeres in hydrophiloids)(1)
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Print References
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