Isotoma is a common genus of springtails, the type genus of the family Isotomidae, containing the following species:
- Isotoma acrea <small>Wray, 1953</small>
- Isotoma agrelli <small>Delamare, 1950</small>
- Isotoma alaskana <small>Christiansen & Bellinger, 1980</small>
- Isotoma alaskensis <small>Fjellberg, 1978</small>
- Isotoma albella <small>Packard, 1873</small>
- Isotoma alpa <small>Christiansen & Bellinger, 1980</small>
- Isotoma anglicana <small>Lubbock, 1873</small>
- Isotoma arborea <small>Linnaeus, 1758</small>
- Isotoma arctica <small>Schött, 1893</small>
- Isotoma aspera <small>Bacon, 1914</small>
- Isotoma atkasukiensis <small>Fjellberg, 1978</small>
- Isotoma beta <small>Christiansen & Bellinger, 1980</small>
- Isotoma blufusata <small>Fjellberg, 1978</small>
- Isotoma brucealla <small>Wray, 1953</small>
- Isotoma caerulea <small>Bourlet, 1839</small>
- Isotoma caeruleatra <small>Guthrie, 1903</small>
- Isotoma canadensis <small>Brown, 1932</small>
- Isotoma cancellarei <small>Christiansen & Bellinger, 1980</small>
- Isotoma carpenteri <small>Börner, 1909</small>
- Isotoma christianseni <small>Fjellberg, 1978</small>
- Isotoma communa <small>MacGillivray, 1896</small>
- Isotoma creli <small>Fjellberg, 1978</small>
- Isotoma decorata <small>(Brown, 1925)</small>
- Isotoma diverticulata <small>Yosii, 1966</small>
- Isotoma dispar <small>Christiansen & Bellinger, 1988</small>
- Isotoma ekmani <small>Fjellberg, 1977</small>
- Isotoma fennica <small>Reuter, 1895</small>
- Isotoma flora <small>Christiansen & Bellinger, 1980</small>
- Isotoma gelida <small>Folsom, 1937</small>
- Isotoma glauca <small>Packard, 1873</small>
- Isotoma gorodkovi <small>Martynova, 1970</small>
- Isotoma hiemalis <small>Schött, 1893</small>
- Isotoma inupikella <small>Fjellberg, 1978</small>
- Isotoma japonica <small>Yosii, 1939</small>
- Isotoma komarkovae <small>Fjellberg, 1978</small>
- Isotoma longipenna <small>MacGillivray, 1896</small>
- Isotoma louisiana <small>Scott, 1962</small>
- Isotoma lucama <small>Wray, 1952</small>
- Isotoma macleani <small>Fjellberg, 1978</small>
- Isotoma manitobae <small>Fjellberg, 1978</small>
- Isotoma manubriata <small>MacGillivray, 1896</small>
- Isotoma marisca <small>Christiansen & Bellinger, 1988</small>
- Isotoma marissa <small>Folsom, 1937</small>
- Isotoma maxillosa <small>Fjellberg, 1978</small>
- Isotoma melanocephala <small>(Börner, 1909)</small>
- Isotoma monochaeta <small>Kos, 1942</small>
- Isotoma monta <small>Christiansen & Bellinger, 1980</small>
- Isotoma multisetis <small>Carpenter & Phillips, 1922</small>
- Isotoma nanseni <small>Fjellberg, 1978</small>
- Isotoma neglecta <small>Schäffer, 1900</small>
- Isotoma nepalica <small>(Yosii, 1966)</small>
- Isotoma nigrifrons <small>Folsom, 1937</small>
- Isotoma nishihirai <small>Yosii, 1965</small>
- Isotoma nixoni <small>Fjellberg, 1978</small>
- Isotoma notabilis <small>Schäffer, 1896</small>
- Isotoma nympha <small>Snider & Calandrino, 1987</small>
- Isotoma persea <small>Wray, 1952</small>
- Isotoma pinnata <small>Börner, 1909</small>
- Isotoma propinqua <small>Axelson, 1902</small>
- Isotoma pseudocinerea <small>Fjellberg, 1975</small>
- Isotoma quadra <small>Christiansen & Bellinger, 1980</small>
- Isotoma randiella <small>Fjellberg, 1978</small>
- Isotoma riparia <small>(Nicolet, 1842)</small>
- Isotoma sandersoni <small>Wray, 1952</small>
- Isotoma sensibilis <small>Tullberg, 1876</small>
- Isotoma spatulata <small>Chamberlain, 1943</small>
- Isotoma speciosa <small>MacGillivray, 1896</small>
- Isotoma sphagneticola <small>Linnaniemi, 1912</small>
- Isotoma spinicauda <small>(Bonet, 1930)</small>
- Isotoma subaequalis <small>Folsom, 1937</small>
- Isotoma subviridis <small>Folsom, 1937</small>
- Isotoma taigicola <small>Fjellberg, 1978</small>
- Isotoma tariva <small>Wray, 1953</small>
- Isotoma tigrina <small>Nicolet, 1842</small>
- Isotoma torildae <small>Fjellberg, 1978</small>
- Isotoma tridentata <small>MacGillivray, 1896</small>
- Isotoma trispinata <small>MacGillivray, 1896</small>
- Isotoma tuckeri <small>Christiansen & Bellinger, 1980</small>
- Isotoma tunica <small>Christiansen & Bellinger, 1980</small>
- Isotoma uniens <small>Christiansen & Bellinger, 1980</small>
- Isotoma variodentata <small>Dunger, 1982</small>
- Isotoma virgata <small>Yosii, 1963</small>
- Isotoma viridis <small>Bourlet, 1839</small>
- Isotoma walkerii <small>Packard, 1871</small>
More recent study meanwhile assigns many of these taxa to other genera than Isotoma, e. g. Desoria, Parisotoma, or Vertagopus. Potapov (2001) lists 14 valid Isotoma species for the Palearctic realm, these are in bold in the list above. The most common species in Central Europe are Isotoma viridis, which dwells natural as well as disturbed habitats, while I. caerulea prefers dryer habitats, I. anglicana cooler climates, and I. riparia streambanks and coastal shorelines.
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