| Neoephemera eatoni |
a large square-gilled mayfly |
Moderate |
GNR |
NA |
Watchlist [Defer to SEAFWA] |
| Acentrella barbarae |
a mayfly |
Moderate |
G2G3 |
NA |
Watchlist [Defer to SEAFWA] |
| Ameletus tertius |
Trinity Comb Minnow Mayfly |
Moderate |
G4 |
NA |
Watchlist [Assessment Priority] |
| Afghanurus rusticalis |
Rusty Flat-headed Mayfly |
Moderate |
G5 |
NA |
RSGCN |
| Eurylophella coxalis |
Barton's Spiny Crawler Mayfly |
Moderate |
G5 |
NA |
Proposed RSGCN |
| Epeorus subpallidus |
a mayfly |
Moderate |
G1Q |
NA |
Proposed RSGCN |
| Procloeon vicinum |
Potomac Small Minnow Mayfly |
High |
G2G3 |
NA |
Watchlist [Assessment Priority] |
| Ameletus walleyi |
Walley's Comb Minnow Mayfly |
High |
G1G2 |
NA |
Proposed Watchlist [Assessment Priority] |
| Rhithrogena jejuna |
Hungry Flat-headed Mayfly |
High |
G5 |
NA |
Proposed Watchlist [Assessment Priority] |
| Rhithrogena brunneotincta |
Brown Flat-headed Mayfly |
High |
G3 |
NA |
Proposed RSGCN |
| Epeorus suffusus |
Blushing Flat-headed Mayfly |
High |
G1Q |
NA |
Watchlist [Assessment Priority] |
| Isonychia hoffmani |
Hoffman's Isonychia Mayfly |
Moderate |
G1G3 |
NA |
Watchlist [Defer to SEAFWA] |
| Heptagenia culacantha |
a flat-headed mayfly |
Moderate |
G2G3 |
NA |
RSGCN |
| Habrophlebiodes celeteria |
a leptophlebiid mayfly |
Moderate |
G2G4 |
NA |
Watchlist [Defer to SEAFWA] |
| Ameletus browni |
Brown's Comb Minnow Mayfly |
High |
G3G4 |
NA |
RSGCN |
| Eurylophella poconoensis |
Poconos Chocolate Dun |
High |
G1G2 |
NA |
Watchlist [Assessment Priority] |
| Tsalia berneri |
Berner's Ephemerella Mayfly |
Moderate |
G4 |
NA |
Watchlist [Defer to SEAFWA] |
| Ephemera blanda |
West Virginia Burrowing Mayfly |
Moderate |
G5 |
NA |
Watchlist [Defer to SEAFWA] |
| Epeorus frisoni |
Roaring Brook Mayfly |
High |
G1 |
NA |
RSGCN |
| Epeorus punctatus |
Dotted Flat-headed Mayfly |
Moderate |
G2G3 |
NA |
RSGCN |
| Baetisca rubescens |
Provancher's Armored Mayfly |
High |
G3G4 |
NA |
RSGCN |
| Barbaetis benfieldi |
Benfield's Bearded Small Minnow Mayfly |
High |
G2G4 |
NA |
RSGCN |
| Siphloplecton costalense |
Speith's Great Speckled Olive Mayfly |
High |
G2G4 |
NA |
Watchlist [Assessment Priority] |
| Siphlonurus demaryi |
Demary's Primitive Minnow Mayfly |
High |
G2G3 |
NA |
RSGCN |
| Siphlonurus barbarus |
Barbarous Primitive Minnow Mayfly |
High |
G1G3 |
NA |
RSGCN |
| Siphlonurus barbaroides |
Wild Primitive Minnow Mayfly |
High |
G3 |
NA |
RSGCN |
| Siphlonisca aerodromia |
Tomah Mayfly |
High |
G2G3 |
NA |
RSGCN |
| Parameletus midas |
Midas Primitive Minnow Mayfly |
High |
G5 |
NA |
RSGCN |
| Neoleptophlebia assimilis |
Southeastern Prong-gilled Mayfly |
High |
G4 |
NA |
Watchlist [Assessment Priority] |
| Afghanurus horrida |
Rough Flat-headed Mayfly |
High |
G2G3 |
NA |
RSGCN |