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Regional Species of Greatest Conservation Need

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Scientific Name	Common Name	Taxon	Subtaxon	Regional Responsibility	RSGCN Status
Pseudemys rubriventris	Northern Red-bellied Cooter (Massachusetts pop.)	Reptile	Turtles	100% (NEAFWA Endemic)	RSGCN
Pseudopleuronectes americanus	Winter Flounder	Fish	Marine Fish	75-100%	RSGCN
Ptychobranchus subtentus	Fluted Kidneyshell	Mollusc	Freshwater Bivalves	<25%	RSGCN
Pyractomena ecostata	Keel-necked Firefly	Insect:Coleoptera	Other Beetles	<25%	RSGCN
Pyrgus centaureae wyandot	Appalachian Grizzled Skipper	Insect:Lepidoptera	Butterflies and Skippers	25-50%	RSGCN
Remenus kirchneri	Blue Ridge Springfly	Insect:EPT	Stoneflies	100% (NEAFWA Endemic)	RSGCN
Rhincodon typus	Whale Shark	Fish	Marine Fish	25-50%	RSGCN
Rhithrogena brunneotincta	Brown Flat-headed Mayfly	Insect:EPT	Mayflies	100% (NEAFWA Endemic)	Proposed RSGCN
Rhithrogena jejuna	Hungry Flat-headed Mayfly	Insect:EPT	Mayflies	25-50%	Proposed Watchlist [Assessment Priority]
Rynchops niger	Black Skimmer	Bird	Waterbirds	<25%	RSGCN
Salvelinus alpinus oquassa	Landlocked Arctic Char	Fish	Freshwater Fish	100% (NEAFWA Endemic)	RSGCN
Satyrium kingi	King's Hairstreak	Insect:Lepidoptera	Butterflies and Skippers	<25%	Watchlist [Defer to SEAFWA]
Sciurus niger cinereus	Delmarva Fox Squirrel	Mammal	Small Mammals:Rodentia	100% (NEAFWA Endemic)	RSGCN
Setophaga cerulea	Cerulean Warbler	Bird	Landbirds	<25%	RSGCN
Setophaga striata	Blackpoll Warbler	Bird	Landbirds	25-50%	Watchlist [Assessment Priority]
Simpsonaias ambigua	Salamander Mussel	Mollusc	Freshwater Bivalves	<25%	RSGCN
Siphlonisca aerodromia	Tomah Mayfly	Insect:EPT	Mayflies	100% (NEAFWA Endemic)	RSGCN
Siphlonurus barbaroides	Wild Primitive Minnow Mayfly	Insect:EPT	Mayflies	100% (NEAFWA Endemic)	RSGCN
Siphlonurus barbarus	Barbarous Primitive Minnow Mayfly	Insect:EPT	Mayflies	75-100%	RSGCN
Siphlonurus demaryi	Demary's Primitive Minnow Mayfly	Insect:EPT	Mayflies	100% (NEAFWA Endemic)	RSGCN
Siphloplecton costalense	Speith's Great Speckled Olive Mayfly	Insect:EPT	Mayflies	100% (NEAFWA Endemic)	Watchlist [Assessment Priority]
Sistrurus catenatus	Eastern Massasauga	Reptile	Snakes	<25%	RSGCN
Somatochlora forcipata	Forcipate Emerald	Insect:Odonata	Dragonflies and Damselflies	75-100%	RSGCN
Somatochlora georgiana	Coppery Emerald	Insect:Odonata	Dragonflies and Damselflies	<25%	RSGCN
Somatochlora incurvata	Incurvate Emerald	Insect:Odonata	Dragonflies and Damselflies	75-100%	RSGCN
Somatochlora kennedyi	Kennedy's Emerald	Insect:Odonata	Dragonflies and Damselflies	50-75%	RSGCN
Sphinx canadensis	Canadian Sphinx	Insect:Lepidoptera	Moths	25-50%	Watchlist [Defer to MAFWA]
Sphinx franckii	Franck's Sphinx	Insect:Lepidoptera	Moths	<25%	Watchlist [Defer to MAFWA/SEAFWA]
Stenogomphurus rogersi	Sable Clubtail	Insect:Odonata	Dragonflies and Damselflies	50-75%	RSGCN
Stenotrema simile	Bear Creek Slitmouth	Mollusc	Terrestrial Snails	100% (NEAFWA Endemic)	RSGCN
Sterna forsteri	Forster's Tern	Bird	Waterbirds	<25%	Watchlist [Defer to MAFWA]
Sternula antillarum	Least Tern	Bird	Waterbirds	25-50%	RSGCN
Succinea pennsylvanica	Penn Ambersnail	Mollusc	Terrestrial Snails	100% (NEAFWA Endemic)	Proposed Watchlist [Assessment Priority]
Sweltsa palearata	Shenandoah Sallfly	Insect:EPT	Stoneflies	100% (NEAFWA Endemic)	RSGCN
Sweltsa pocahontas	Pocahontas Sallfly	Insect:EPT	Stoneflies	100% (NEAFWA Endemic)	RSGCN
Synaptomys borealis sphagnicola	Northern Bog Lemming	Mammal	Small Mammals:Rodentia	75-100%	RSGCN
Tallaperla lobata	Lobed Roachfly	Insect:EPT	Stoneflies	100% (NEAFWA Endemic)	RSGCN
Tharsalea dorcas claytoni	Clayton's Copper Butterfly	Insect:Lepidoptera	Butterflies and Skippers	75-100%	RSGCN
Theliderma cylindrica	Rabbitsfoot	Mollusc	Freshwater Bivalves	<25%	RSGCN
Thoburnia hamiltoni	Rustyside Sucker	Fish	Freshwater Fish	75-100%	RSGCN
Thunnus thynnus	Bluefin Tuna	Fish	Marine Fish	<25%	RSGCN
Triodopsis picea	Spruce Knob Threetooth	Mollusc	Terrestrial Snails	100% (NEAFWA Endemic)	Watchlist [Assessment Priority]
Triodopsis platysayoides	Cheat Threetooth	Mollusc	Terrestrial Snails	100% (NEAFWA Endemic)	RSGCN
Utaperla gaspesiana	Gaspe Sallfly	Insect:EPT	Stoneflies	75-100%	RSGCN
Ventridens coelaxis	Bidentate Dome	Mollusc	Terrestrial Snails	<25%	Watchlist [Assessment Priority]
Zale lunifera	Pine Barrens Zale Moth	Insect:Lepidoptera	Moths	25-50%	Watchlist [Assessment Priority]