Rare Species by County: Suffolk
Last Updated on 3/1/2003
| Taxonomic Group | Scientific Name | Common Name | State Rank | Federal Rank | Most Recent Obs |
| Fish | Gasterosteus aculeatus | Threespine Stickleback | T | (PS) | 1996 |
| Amphibian | Ambystoma laterale | Blue-Spotted Salamander | SC | 2000 | |
| Amphibian | Hemidactylium scutatum | Four-Toed Salamander | SC | 1939 | |
| Amphibian | Scaphiopus holbrookii | Eastern Spadefoot | T | 1932 | |
| Reptile | Clemmys guttata | Spotted Turtle | SC | 1995 | |
| Reptile | Clemmys insculpta | Wood Turtle | SC | 1979 | |
| Reptile | Terrapene carolina | Eastern Box Turtle | SC | 1989 | |
| Bird | Accipiter striatus | Sharp-Shinned Hawk | SC | (PS) | 1898 |
| Bird | Bartramia longicauda | Upland Sandpiper | E | 1993 | |
| Bird | Charadrius melodus | Piping Plover | T | (LE,LT) | 1983 |
| Bird | Falco peregrinus | Peregrine Falcon | E | (PS:LE) | 2001 |
| Bird | Gavia immer | Common Loon | SC | 1824 | |
| Bird | Pooecetes gramineus | Vesper Sparrow | T | 1985 | |
| Bird | Sterna antillarum | Least Tern | SC | (PS:LE) | 1998 |
| Bird | Sterna hirundo | Common Tern | SC | 1998 | |
| Bird | Tyto alba | Barn Owl | SC | 1989 | |
| Bird | Vermivora chrysoptera | Golden-Winged Warbler | E | 1877 | |
| Mussel | Ligumia nasuta | Eastern Pondmussel | SC | 1841 | |
| Beetle | Cicindela duodecimguttata | Twelve-Spotted Tiger Beetle | SC | 1914 | |
| Beetle | Cicindela purpurea | Purple Tiger Beetle | SC | 1928 | |
| Beetle | Cicindela rufiventris hentzii | Hentz's Redbelly Tiger Beetle | T | 1927 | |
| Beetle | Desmocerus palliatus | Elderberry Long-Horned Beetle | SC | 1926 | |
| Butterfly/Moth | Apodrepanulatrix liberaria | New Jersey Tea Inchworm | E | 1900 | |
| Butterfly/Moth | Erynnis persius persius | Persius Duskywing | E | ||
| Butterfly/Moth | Metarranthis apiciaria | Barrens Metarranthis Moth | E | 1934 | |
| Butterfly/Moth | Rhodoecia aurantiago | A Noctuid Moth | T | 1988 | |
| Vascular Plant | Agrimonia pubescens | Hairy Agrimony | T | 1913 | |
| Vascular Plant | Arabis missouriensis | Green Rock-Cress | T | 1930 | |
| Vascular Plant | Aristida purpurascens | Purple Needlegrass | T | 18-- | |
| Vascular Plant | Aristida tuberculosa | Seabeach Needlegrass | T | 1882 | |
| Vascular Plant | Asclepias purpurascens | Purple Milkweed | E | 1896 | |
| Vascular Plant | Asclepias verticillata | Linear-Leaved Milkweed | T | 1918 | |
| Vascular Plant | Carex striata var brevis | Walter's Sedge | E | ||
| Vascular Plant | Elymus villosus | Hairy Wild Rye | E | 1909 | |
| Vascular Plant | Eriophorum gracile | Slender Cottongrass | T | 1885 | |
| Vascular Plant | Eupatorium aromaticum | Lesser Snakeroot | E | 1896 | |
| Vascular Plant | Gentiana andrewsii | Andrews' Bottle Gentian | E | 1882 | |
| Vascular Plant | Houstonia longifolia var longifolia | Long-Leaved Bluet | E | 1918 | |
| Vascular Plant | Liatris borealis | New England Blazing Star | SC | 1933 | |
| Vascular Plant | Linum medium var texanum | Rigid Flax | T | 1909 | |
| Vascular Plant | Lycopus rubellus | Gypsywort | E | 1896 | |
| Vascular Plant | Myriophyllum alterniflorum | Alternate-Flowered Water-Milfoil | T | ||
| Vascular Plant | Ophioglossum pusillum | Adder's-Tongue Fern | T | 1884 | |
| Vascular Plant | Pedicularis lanceolata | Swamp Lousewort | E | ||
| Vascular Plant | Platanthera flava var herbiola | Pale Green Orchis | T | 1908 | |
| Vascular Plant | Ranunculus micranthus | Tiny-Flowered Buttercup | E | 1891 | |
| Vascular Plant | Rumex pallidus | Seabeach Dock | T | 1984 | |
| Vascular Plant | Sanicula odorata | Long-Styled Sanicle | T | 1910 | |
| Vascular Plant | Scirpus longii | Long's Bulrush | T | 1999 | |
| Vascular Plant | Suaeda calceoliformis | American Sea-Blite | SC | 1909 | |
| Vascular Plant | Viola brittoniana | Britton's Violet | T | 1990 |