''Hydrachna'' is a genus of mites in the family

Hydrachnidae Hydrachnidae is a family of mites in the superfamily (biology), superfamily Hydrachnoidea, first defined by William Elford Leach. Description The family was defined within Hydrachnoidea. These mites may be brilliant red or orange in colour, unusu ...

, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of

water beetles A water beetle is a generalized name for any beetle that is adapted to living in water at any point in its life cycle. Most water beetles can only live in fresh water, with a few marine species that live in the intertidal zone or littoral zone. T ...

such as '' Eretes griseus'' by attaching to the back of the thorax and abdomen. These water mite larvae are also hosts of ''

Callicorixa ''Callicorixa'' is a genus of water boatmen in the family Corixidae. There are about nine described species in ''Callicorixa''. Species These nine species belong to the genus ''Callicorixa'': * '' Callicorixa alaskensis'' Hungerford, 1926 * '' ...

'', ''

Corixa ''Corixa'' is a genus of aquatic bugs in the family Corixidae. The fossil species ''C. elegans'' is from the Rott Formation The Rott Formation is a geologic formation in Germany. It preserves fossils dating back to the Oligocene. See also ...

'', '' Cymatia'' and ''

Sigara ''Sigara'' is a genus of water boatmen in the family Corixidae. Some species within this genus are halophiles; for example, occurrences of the genus have been noted in the hypersaline Makgadikgadi Pans in Botswana.C. Michael Hogan (2008''Makgadi ...

'' species, although '' Sigara falleni'' has been described as "immune" to these mites, and '' Cymatia coleoptrata'' and ''

Sigara striata ''Sigara striata'' is a species of Corixidae, water boatman in the family Corixidae in the order Hemiptera.Tree of Life Web Pro ...

'' also gain this "immunity" after a few years of interaction.

Species

These 87 species belong to the genus ''Hydrachna'': * '' Hydrachna analis'' Viets & K. * '' Hydrachna approximata'' Halik, 1940 * '' Hydrachna baculoscutata'' Crowell, 1960 * '' Hydrachna batorligetiensis'' Szalay, 1953 * '' Hydrachna bilobata'' Halik, 1940 * '' Hydrachna bimaculata'' Koenike * ''

Hydrachna bisignifera ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Viets & K. * ''

Hydrachna brehmi ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Szalay, 1955 * '' Hydrachna bulgarensis'' K.Viets, 1940 * '' Hydrachna canadensis'' Marshall, 1929 * '' Hydrachna comosa'' Koenike, 1896 * ''

Hydrachna conjecta ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Koenike, 1895 * ''

Hydrachna conjectoides ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Lundblad, 1947 * ''

Hydrachna cordata ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' * ''

Hydrachna crenulata ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Marshall, 1930 * ''

Hydrachna cronebergi ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Koenike, 1897 * ''

Hydrachna cruenta ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Muller, 1776 * ''

Hydrachna curtiscutata ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' * ''

Hydrachna danubialis ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Laska, 1964 * ''

Hydrachna denudata ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Piersig, 1896 * ''

Hydrachna distincta ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Koenike, 1897 * ''

Hydrachna dorsoscutata ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Viets & K. * '' Hydrachna eugeni'' K.H.Viets, 1911 * ''

Hydrachna extorris ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as ''Eretes griseus'' by a ...

'' Koenike, 1897 * '' Hydrachna geographica'' Muller, 1776 * '' Hydrachna georgei'' Soar, 1908 * '' Hydrachna globosa'' (De Geer, 1778) * '' Hydrachna goldfeldi'' Thor, 1916 * '' Hydrachna guanajuatensis'' Cook * '' Hydrachna halberti'' Soar, 1908 * '' Hydrachna hamata'' Lundblad, 1947 * '' Hydrachna hesperia'' Lundblad, 1934 * ''

Hydrachna heterophthalma ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Viets & K. * '' Hydrachna hormuzakii'' Husiatinschi, 1937 * '' Hydrachna hungerfordi'' Lundblad, 1934 * ''

Hydrachna hutchinsoni ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Lundblad, 1934 * '' Hydrachna incognita'' (Wainstein, 1976) * ''

Hydrachna inermis ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Piersig, 1895 * '' Hydrachna inversa'' Walter, 1927 * '' Hydrachna juncta'' Walter, 1926 * '' Hydrachna laceriscuta'' Lundblad, 1941 * '' Hydrachna leegei'' Koenike * '' Hydrachna levigata'' Koenike, 1897 * '' Hydrachna levis'' Williamson, 1913 * '' Hydrachna linderi'' Lundblad, 1947 * '' Hydrachna longiscutata'' * '' Hydrachna lupus'' Wainstein, 1976 * '' Hydrachna magniscutata'' Marshall, 1927 * ''

Hydrachna marita ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Wainstein, 1966 * '' Hydrachna marshallae'' Lundblad, 1934 * '' Hydrachna microscutata'' Marshall, 1929 * '' Hydrachna miliaria'' Berlese, 1888 * '' Hydrachna miyazakii'' Uchida, 1937 * '' Hydrachna multipora'' Cook, 1967 * '' Hydrachna mysorensis'' Cook, 1967 * '' Hydrachna mystomirabilis'' Habeed, 1954 * '' Hydrachna neocaledonica'' Smit, 2002 * '' Hydrachna nonlamellata'' Viets & K. * '' Hydrachna novaehollandica'' * '' Hydrachna oculoscutata'' Smit, 2002 * '' Hydrachna orientalis'' Thon, 1905 * '' Hydrachna paludosa'' * '' Hydrachna palustris'' Smit, 1992 * '' Hydrachna papilligera'' K.H.Viets, 1919 * '' Hydrachna perpera'' Koenike, 1908 * '' Hydrachna piersigi'' Koenike, 1897 * ''

Hydrachna processifera ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Koenike, 1903 * '' Hydrachna queenslandica'' * ''

Hydrachna rectirostris ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Viets & K. * '' Hydrachna rhopaloidea'' K.H.Viets, 1942 * '' Hydrachna rotunda'' Marshall, 1930 * '' Hydrachna rubicunda'' K.H.Viets, 1930 * '' Hydrachna schneideri'' Koenike, 1895 * '' Hydrachna similans'' Marshall, 1928 * '' Hydrachna simulans'' Marshall, 1928 * '' Hydrachna sistanica'' Pesic, Smit & Saboori, 2012 * '' Hydrachna stipata'' Lundblad, 1934 * '' Hydrachna tasmanica'' Lundblad, 1947 * '' Hydrachna tchadensis'' Smit, 1994 * '' Hydrachna tenuissima'' Viets, 1935 * '' Hydrachna testudinata'' Cook * '' Hydrachna trilobata'' Viets & K. * '' Hydrachna triscutata'' Lundblad, 1947 * '' Hydrachna valida'' * '' Hydrachna ventrifissa'' Viets & K. * ''

Hydrachna vulpes ''Hydrachna'' is a genus of mites in the family Hydrachnidae, the sole genus of the family. There are more than 80 described species in ''Hydrachna''. Larvae of this genus are known to be parasites of water beetles such as '' Eretes griseus'' by ...

'' Wainstein, 1976 * '' Hydrachna williamsoni'' Soar, 1908

Species

References

Further reading