Agnetina Extrema
''Agnetina'' is a genus of common stoneflies in the family Perlidae. There are at least 30 described species in ''Agnetina''. Species These 31 species belong to the genus ''Agnetina'': * '' Agnetina aequalis'' (Banks, 1937) * '' Agnetina annulipes'' (Hagen, 1861) (southern stone) * '' Agnetina armata'' (Banks, 1940) * '' Agnetina brevipennis'' (Navás, 1912) * '' Agnetina cadaverosa'' (McLachlan, 1875) * '' Agnetina capitata'' (Pictet, 1841) (northern stone) * '' Agnetina chrysodes'' Navás, 1919 * '' Agnetina circumscripta'' (Klapálek, 1912) * '' Agnetina cocandica'' (McLachlan, 1875) * '' Agnetina curvigladiata'' Du, Y. & Chou, 1998 * '' Agnetina den'' Cao, T.K.T. & Bae, 2006 * '' Agnetina duplistyla'' (Wu, C.F., 1962) * '' Agnetina elegantula'' (Klapálek, 1905) * '' Agnetina extrema'' (Navás, 1912) * '' Agnetina flavescens'' (Walsh, 1862) (midwestern stone) * '' Agnetina gladiata'' (Wu, C.F., 1962) * '' Agnetina immersa'' (McLachlan, 1875) * '' Agnetina jarai'' Stark & Siv ...
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Perlidae
The Perlidae are a family of stoneflies, with more than 50 genera and 1,100 described species. The majority of the Perlidae are found in eastern North America, but they occur worldwide except for Antarctica and parts of Africa. Their lifecycles range between one and three years. They adults emerge in the summer; they are very active and known to be attracted to light sources. They are usually very sensitive to changes in environment. Perlidae are usually lotic and lentic erosional. They are found in cool, clear medium-sized to large streams and sometimes in larger, warm rivers that carry silt. They are crawlers and can move quickly. In still water, no water moves over their gills, so they move their bodies up and down to keep oxygen