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Tentative keys to Pennsylvania
Stonefly Families Nemou=
ridae
Nemourid nymphs can be placed into 3 groups based on presence of gills or key characters of prontoum setae and hairs and setae on forelegs: Nymphs without neck= gills are extremely difficult to separate, especially in early instars. This key dapted from Stewart &= Stark nymph book key. Comments are encouraged.
1a. N=
ymphs
with neck gills. =
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Amphinemura
2a.
Pronotum squarish. =
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3
3a.
Pronotum with a lateral notch near posterior edge. =
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Soyedina
·=
; =
Spring/spring run/seep specialist, rarely found in creeks. Nymphs are relatively large and ro=
bust.
·=
; =
March
to April emergence.
4a.
Pronotum with a distinct lateral row of short bristles; and w=
ing
pads with a distinct fringe of bristles on lateral margins- bristles
long on anterior edge. This g=
ives
the nymphs a very hairy look. =
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Nemoura
·=
; =
Extremely rare. Springs & tiny first-order
streams & spring runs, perhaps edges of swampy low gradient
streams.
·=
; =
Emergence
in May.
4b.
Pronotum with short irregularly spaced bristles- bristles sparse; wi=
ng
pads without bristles =
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5
5b.
Foretibia with short, stout bristles. =
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Prostoia
Note: Prostoia
and Ostrocerca not likely to be in same habitats.