List of North American animals extinct in the Holocene facts for kids

This is an incomplete list of extinct animals of North America. This list covers only extinctions from the Holocene epoch, a geological period that extends from the present day back to about 10,000 radiocarbon years, approximately 11,430 ± 130 calendar years BP (between 9560 and 9300 BC).

Map of North America

Mammals

Prehistoric mammal extinctions (beginning of the Holocene to 1500 C.E.)

Common name/scientific name	Extinction date (BCE)	Range	Image
American mastodon Mammut americanum	8,500	North America
American mountain deer Odocoileus lucasi	10,000	the Rocky Mountains, the Guadalupe Mountains
American lion Panthera atrox	11,000	Alaska to Central America	-
Aztlanolagus agilis	10,000	southeastern Arizona to Central America
Beautiful armadillo Dasypus bellus	8,000	the North American Southwest to South America	--
Bison antiquus	10,000	the U.S. and Canada
Bison occidentalis	3,000	Alaska to Minnesota	--
Camelops Camelops spp.	8,000	Western North America
Caribbean ground sloths	3,000	the Caribbean islands
Columbian mammoth Mammuthus columbi	5,800	the northern U.S. to Central America
Dire wolf Aenocyon dirus	7,400	mid-latitude North America to South America
Florida spectacled bear Tremarctos floridanus	8,000	the southern U.S.	--
Glyptodon	10,000	Central America to South America
Harlan's muskox Bootherium bombifrons	9,000	North America
Holmesina septentrionalis	8,000	the southern U.S. to South America
Jefferson's ground sloth Megalonyx spp.	11,000	North America
Mylohyus M. elmorei, M. floridanus, M. fossilis, M. gidleyi and M. nasutus	9,000	North America
Pleistocene North American jaguar Panthera onca augusta	10,000	the Pacific Northwest to Panama
Pygmy mammoth Mammuthus exilis	10,800-11,300	the Channel Islands of California, U.S.
Saber-toothed cat Smilodon fatalis	8,000	North America
Saiga antelope Saiga tatarica	10,000	North America
Scimitar-toothed cats Homotherium sp.	10,000	North America
Giant short-faced bear Arctodus simus	8,000	North America
Shrub-ox Euceratherium collinum	9,500	North America
Steppe bison Bison priscus	5,400	North America
Stout-legged llama Palaeolama mirifica	10,000	North and South America	--
Western horse Equus occidentalis	10,000	North America
Woolly mammoth Mammuthus primigenius	2,000	Wrangel Island (the Bering Sea)

Recent mammal extinctions (1500 C.E. to the present)

Common name/scientific name	Extinction date	Range	Image
Martinique giant rice rat Megalomys desmarestii	1902	Martinique
Anthony's woodrat Neotoma anthonyi	1926	Mexico (only on Isla Todos Santos)	--
Atlantic gray whale Eschrichtius robustus	the 17th century	the East Coast
Banks Island wolf Canis lupus bernardi	1920	the Arctic Archipelago	--
Barbados raccoon Procyon lotor gloveralleni	1964	Barbados	--
Bunker's woodrat Neotoma bunkeri	1932	Mexico (the Coronados Islands)
California grizzly bear Ursus arctos californicus	1922	California
Caribbean monk seal Monachus tropicalis	1952	the Caribbean Sea
Cascade Mountains wolf Canis lupus fuscus	1940	the Pacific Northwest	--
Cuban coney Geocapromys columbianus	the 1500s	Cuba	--
Eastern cougar Puma concolor couguar	unknown (declared in 2011)	Northeastern North America
Eastern elk Cervus canadensis canadensis	1877	Laurentia
Florida black wolf Canis lupus floridanus	1908
Goff's pocket gopher Geomys pinetis goffi	1955	Florida	--
Gull Island vole Microtus pennsylvanicus nesophilus	1897	Gull Island, New York	--
Hispaniolan edible rat Heteropsomys insulans	the 1500s	Hispaniola	--
Insular cave rat Heteropsomys insulans	the 1600s	Puerto Rico	--
Imposter hutia Hexolobodon phenax	the 1500s	Hispaniola	--
Jamaican monkey Xenothrix mcgregori	the 1500s	Jamaica	--
Jamaican rice rat Oryzomys antillarum	the 1870s	Jamaica
Little Swan Island hutia Geocapromys thoracatus	1955	Little Swan Island, Honduras
Marcano's solenodon Solenodon marcanoi	the 1500s	Hispaniola	--
Merriam's elk Cervus canadensis merriami	1906	the southwestern U.S.	--
Mexican grizzly bear Ursus arctos horribilis (formerly Ursus arctos nelsoni)	1964	Mexico and the southwestern U.S.
Montane hutia Isolobodon montanus	the 1500s	Hispaniola	--
Nelson's rice rat Oryzomys nelsoni	1897	María Madre Island, Mexico
Nevis rice rat Pennatomys nivalis	the 1500s	Netherlands (Sint Eustatius) and Saint Kitts, Nevis	--
Newfoundland wolf Canis lupus beothucus	1911	Newfoundland
Oriente cave rat Boromys offella	the 1500s	Cuba
Pallid beach mouse Peromyscus polionotus decoloratus	1959	Florida	--
Puerto Rican hutia Isolobodon portoricensis	the 1600s	Hispaniola and Puerto Rico	--
Puerto Rican long-nosed bat Monophyllus frater	the 1600s	Puerto Rico	--
Saint Lucia giant rice rat Megalomys luciae	1852	Saint Lucia
Saint Vincent pygmy rice rat Oligoryzomys victus	1898	Saint Vincent	--
Samana hutia Plagiodontia ipnaeum	the 1500s	Hispaniola	--
San Martín Island woodrat Neotoma martinensis	1950	San Martín Island, Mexico	--
Sea mink Neovison macrodon	1860	Atlantic Canada and the New England region	--
Smith Island cottontail Sylvilagus floridanus hitchensi	before 1987	Smith Island, Virginia	--
Southern California kit fox Vulpes macrotis macrotis	1903	Southern California, U.S.	--
Southern Rocky Mountain wolf Canis lupus youngi	1935	the southern Rocky Mountains, U.S.	--
Steller's sea cow Hydrodamalis gigas	1768	the Commander Islands
Tacoma pocket gopher Thomomys mazama tacomensis	1970	the Pacific Northwest (Washington)	--
Torre's cave rat Boromys torrei	the 1500s	Cuba
Tule shrew Sorex ornatus juncensis	1905	Baja California, Mexico	--
West Indies nesophontes Nesophontes sp. Atalaye nesophontes Cuban nesophontes Greater Cuban nesophontes Haitian nesophontes Lesser Cuban nesophontes Puerto Rican nesophontes Saint Michel nesophontes Slender Cuban nesophontes Western Cuban nesophontes	the 1500s	Cuba, Hispaniola, Puerto Rico, the U.S. Virgin Islands and the Cayman Islands

Possibly extinct mammals

Birds

Prehistoric bird extinctions (beginning of the Holocene to 1500 C.E.)

Common name/scientific name	Extinction date	Range	Image
Aiolornis incredibilis	the Late Pleistocene	North America	--
Antillean cave rail Nesotrochis debooyi	the Late Pleistocene	Puerto Rico and the U.S. Virgin Islands
Californian turkey Meleagris californica	10,000	California	--
Cathartornis gracilis	10,000	California	--
Chendytes lawi	1,800	the California coast
Cuban condor Gymnogyps varonai	the Early Holocene	Cuba	--
Daggett's eagle Buteogallus daggetti	13,000	California and Nuevo León, Mexico	--
La Brea stork Ciconia maltha	10,000	the western and southern U.S., Cuba
Saint Croix macaw Ara autocthones	Unknown	Saint Croix and Puerto Rico	--
Teratorns Teratornis merriami and Teratornis woodburnensis	8,000	North America
Woodward's eagle Amplibuteo woodwardi	the Late Pleistocene	Caribbean	--

Recent bird extinctions (1500 C.E. to the present)

Common name/scientific name	Extinction date	Range	Image
Antiguan burrowing owl Athene cunicularia amaura	the late 19th century	Antigua and Barbuda	--
Atitlán grebe Podilymbus gigas	1989	Guatemala
Bahaman barn owl Tyto pollens	c. the 16th century	Andros Island, the Bahamas
Bermuda flicker Colaptes oceanicus	c. the 18th century	Bermuda	--
Bermuda hawk Bermuteo avivorus	c. 1603	Bermuda	--
Bermuda night heron Nyctanassa carcinocatactes	c. the 18th century	Bermuda	--
Bermuda saw-whet owl Aegolius gradyi	the 1600s	Bermuda	--
Brace's emerald Chlorostilbon bracei	the 1870s	the Bahamas	--
Carolina parakeet Conuropsis carolinensis	1918	the eastern U.S. and eastern Canada
Cuban ivory-billed woodpecker Campephilus principalis bairdii	c. 1990	Cuba
Cuban macaw Ara tricolor	the 1860s	Cuba
Dusky seaside sparrow Ammospiza maritima nigrescens	1987	Florida, U.S.
Gould's emerald Chlorostilbon elegans	Unknown	the Bahamas or Jamaica
Grand Cayman thrush Turdus ravidus	1940s	Grand Cayman	--
Great auk Pinguinus impennis	1852	the North Atlantic coast
Guadalupe caracara Caracara lutosa	1900	Guadalupe, Mexico
Guadeloupe burrowing owl Athene cunicularia guadeloupensis	late 19th century	Guadeloupe	--
Guadeloupe parakeet Aratinga labati	c. 18th century	Guadeloupe
Guadeloupe parrot Amazona violacea	1779	Guadeloupe
Heath hen Tympanuchus cupido cupido	1932	the New England region
Labrador duck Camptorhynchus labradorius	1878	the Atlantic Northeast
Lesser Antillean macaw Ara guadeloupensis	1760	Guadeloupe
Martinique parrot Amazona martinicana	1779	Martinique
Mauge's parakeet Aratinga chloroptera maugei	1779	Mona Island, Puerto Rico
New Mexico sharp-tailed grouse Tympanuchus phasianellus hueyi	1954	the United States (Colorado and New Mexico)	--
Passenger pigeon Ectopistes migratorius	1914	the eastern U.S. and eastern Canada
Slender-billed grackle Quiscalus palustris	1910	Central Mexico
Spectacled cormorant Phalacrocorax perspicillatus	1850	the Commander Islands
Socorro elf owl Micrathene whitneyi graysoni	1970	Mexico (Socorro Island)	--

Possibly extinct birds

Common name/scientific name	Extinction date	Range	Image
Bachman's warbler Vermivora bachmanii	1988	the southeastern U.S.
Eskimo curlew Numenius borealis	1981	Alaska to Argentina
Guadalupe storm-petrel Oceanodroma macrodactyla	1912	Guadalupe, Mexico
Imperial woodpecker Campephilus imperialis	1956	Mexico
Indigo-capped hummingbird Amazilia cyanifrons	the early 1940s	Costa Rica
American ivory-billed woodpecker Campephilus principalis principalis	1944 or afterward	the southeastern U.S.
Jamaican petrel Pterodroma caribbaea	1879	Jamaica
Jamaican poorwill Siphonorhis americana	1860	Jamaica
Semper's warbler Leucopeza semperi	1961	Saint Lucia

Reptiles

Recent reptile extinctions (1500 C.E. to the present)

Common name/scientific name	Extinction date	Range	Image
Martinique giant ameiva Ameiva major	Unknown	Martinique
Martinique curly-tailed lizard Leiocephalus herminieri	1830s	Martinique	--
Navassa curly-tailed lizard Leiocephalus eremitus	1868	Navassa Island	--
Guadeloupe ameiva Pholidoscelis cineraceus	1928	Guadeloupe	--
Navassa Island dwarf boa Tropidophis bucculentus	the late 19th century	Navassa Island	--
Navassa Island iguana Cyclura cornuta onchiopsis	the late 19th century	Navassa Island	--
Saint Croix racer Borikenophis sanctaecrucis	unknown	Saint Croix	--

Possibly extinct reptiles

Common name/scientific name	Extinction date	Range	Image
Culebra Island giant anole Xiphosurus roosevelti	1978	Culebra Island, Puerto Rico	--
Jamaica giant galliwasp Celestus occiduus	1840	Jamaica

Amphibians

Recent amphibian extinctions (1500 C.E. to the present)

Common name/scientific name	Extinction date	Range	Image
Ainsworth's salamander Plethodon ainsworthi	1964	the U.S.	--
Craugastor chrysozetetes	Unknown	Honduras	--
Craugastor escoces	1986	Costa Rica	--
Golden toad Bufo periglenes	1989	Costa Rica
Rabbs' fringe-limbed treefrog Ecnomiohyla rabborum'	2016	Panama

Possibly extinct amphibians

Common name/scientific name	Extinction date	Range	Image
Atoyac minute salamander Thorius infernalis	the 1980s	Guerrero, Mexico	--
Bigfoot splayfoot salamander Chiropterotriton magnipes	Unknown	San Luis Potosí and Querétaro, Mexico	--
Golden coqui Eleutherodactylus jasperi	1981	Puerto Rico
San Martin pygmy salamander Thorius narismagnus	1980s	Veracruz, Mexico	--
Web-footed coquí Eleutherodactylus karlschmidti	1974	Puerto Rico	--

Fish

Prehistoric fish extinctions (beginning of the Holocene to 1500 C.E.)

Common name/scientific name	Extinction date	Range	Image
Saber-toothed salmon Oncorhynchus rastrosus	the Late Pleistocene	the western coast of Canada and the U.S.

Recent fish extinctions (1500 C.E. to the present)

Common name/scientific name	Extinction date	Range	Image
Alberca silverside Chirostoma bartoni	2006	the Lerma River Basin, Mexico	--
Alvord cutthroat trout Oncorhynchus clarki alvordensis	the 1920s	Alvord Dry Lake, Oregon	--
Amistad gambusia Gambusia amistadensis	unknown (declared in 1987)	Goodenough Spring, Texas
Ash Meadows killifish Empetrichthys merriami	1948	Ash Meadows, Nevada
Banff longnose dace Rhinichthys cataractae smithi	unknown (declared in 1987)	Banff, Alberta	--
Blackfin cisco Coregonus nigripinnis	1969	the Great Lakes, Canada and the U.S.	--
Blue walleye Sander vitreus glaucus	1983	the Great Lakes, Canada and the U.S.
Cachorrito de la Trinidad Cyprinodon inmemoriam	unknown	Mexico	--
Catarina pupfish Megupsilon aporus	2014	Nuevo León, Mexico	--
Clear Lake splittail Pogonichthys ciscoides'	the 1970s	Clear Lake, California	--
Deepwater cisco Coregonus johannae	1952	the Great Lakes, Canada and the U.S.	--
Durango shiner Notropis aulidion	unknown	Mexico	--
Endorheic chub Evarra tlahuacensis	1983	Mexico	--
Graceful priapella Priapella bonita	unknown	Mexico	--
Grass Valley speckled dace Rhinichthys osculus reliquus	1938	Lander County, Nevada	--
Harelip sucker Moxostoma lacerum	1893	the southeastern U.S.	--
Las Vegas dace Rhinichthys deaconi	1986	the Vegas Valley, Nevada	--
Least silverside Chirostoma charari	1957	Mesa Central, Mexico	--
Longjaw cisco Coregonus alpenae	1975	the Great Lakes, Canada and the U.S.	--
Maryland darter Etheostoma sellare	1988	Deer Creek, Maryland
Mexican dace Evarra bustamantei	1983	Mexico	--
Pahranagat spinedace Lepidomeda altivelis	1938	the Pahranagat Valley, Nevada	--
Phantom shiner Notropis orca	1975	the Rio Grande Basin, Mexico and the U.S.	--
Parras characodon Characodon garmani	unknown	Mexico	--
Perrito de Parras Cyprinodon latifasciatus	unknown	Mexico	--
Perrito de Sandia Cyprinodon spp.	unknown	Mexico	--
Plateau chub Evarra eigenmanni	1983	Mexico	--
Raycraft Ranch killifish Empetrichthys latos concavus	unknown	Raycraft Ranch, Nevada	--
Rio Grande bluntnose shiner Notropis simus simus	1964	the Rio Grande Basin, Mexico and the U.S.	--
Salado shiner Notropis saladonis	unknown	Mexico	--
San Marcos gambusia Gambusia georgei	1983	the San Marcos Spring, Texas	--
Scioto madtom Noturus trautmani	1957	Big Darby Creek, Ohio	--
Shortnose cisco Coregonus reighardi	1985	the Great Lakes, Canada and the U.S.
Silver trout Salvelinus agassizi	1930	Dublin Pond, New Hampshire
Snake River sucker Chasmistes muriei	unknown	the Snake River, Wyoming	--
Stumptooth minnow Stypodon signifer	unknown	Mexico	--
Tecopa pupfish Cyprinodon nevadensis calidae	1979	the Majavo Desert Springs, California
Thicktail chub Gila crassicauda	the 1950s	the Central Valley of California
Utah Lake sculpin Cottus echinatus	1928	Utah Lake, Utah	--
Villa Lopez pupfish Cyprinodon ceciliae	unknown	Mexico	--
Yellowfin cutthroat trout Oncorhynchus clarki macdonaldi	after 1903	Twin Lakes, Colorado	--

Crustaceans

• Cambarellus alvarezi, around 1994, Mexico (Nuevo León)
• Chihuahua dwarf crayfish, Cambarellus chihuahuae unknown, Mexico (Chihuahua)
• Florida fairy shrimp , Dexteria floridana, unknown, Florida
• Hemigrapsus estellinensis , 1963, Estelline, Texas
• Pasadena freshwater shrimp , Syncaris pasadenae, 1933, Los Angeles, California
• Rubious cave amphipod , Stygobromus lucifugus, unknown, Illinois
• Sandhills crayfish , Procambarus angustatus, unknown, Georgia
• Sooty crayfish , Pacifastacus nigrescens, late 19th century, San Francisco Bay, California

Insects

The chestnut casebearer moth's larva case

The Rocky Mountain locust

The Sloane's Urania butterfly

The xerces blue

• American chestnut moth, Ectoedemia castaneae, unknown, the U.S.
• Antioch Dunes shieldback katydid, Neduba extincta, unknown, the U.S.
• Athens caddisfly, Triaenodes phalacris, unknown, the U.S.
• Castle Lake caddisfly, Rhyacophila amabilis, unknown, the U.S.
• Central Valley grasshopper, Conozoa hyalina, unknown, the U.S.
• Chestnut casebearer moth, Coleophora leucochrysella, 1900, the U.S.
• Chestnut ermine moth,Argyresthia castaneella, unknown, the U.S.
• Chestnut clearwing moth, Coptotriche perplexa, unknown, the U.S.
• Fort Ross weevil, Trigonoscuta rossi, unknown, the U.S.
• Macrancylus linearis, unknown, the U.S. and the West Indies
• Mono Lake diving beetle, Hygrotus artus, unknown, California
• Oeobia sp. Nov, unknown, the U.S.
• Phleophagan chestnut moth, Ectoedemia phleophaga, unknown, Virginia
• Pecatonica River mayfly, Acanthometropus pecatonica, unknown, the U.S.
• Rocky Mountain locust, Melanoplus spretus, 1902, the Great Plains, Canada and the U.S.
• Robert's stonefly, Alloperla roberti, unknown, the U.S.
• Robust burrowing mayfly, Pentagenia robusta, unknown, the Ohio River area
• Three-toothed caddisfly, Triaenodes tridonata, unknown, the U.S.
• Sloane's Urania butterfly, Urania sloanus, 1894, Jamaica
• Volutine stoneyian tabanid fly, Stonemyia volutina, unknown, the U.S.
• Xerces blue butterfly, Glaucopsyche xerces, 1943, the Sunset District of San Francisco, California
• Yorba Linda weevil, Trigonoscuta yorbalindae, unknown, the U.S.

Arachnids

• Caribbean monk seal nasal mite, Halarachne americana, 1952, the Caribbean Sea
• Tityus exstinctus, 1884, Martinique

Mollusks

The Cahaba pebblesnail

The corded purg

The little flat-top snail

The shoal sprite

Umbilicate pebblesnail

• Acorn pearly mussel, Epioblasma haysiana, unknown, the Cumberland and Tennessee Rivers
• Acorn ramshell, Planorbella multivolvis, unknown, Michigan
• Agate rocksnail,Leptoxis clipeata, unknown, Alabama
• Alabama clubhsell, Pleurobema troschelianum, unknown, Alabama, Georgia and Tennessee
• Alabama pigtoe, Pleurobema johannis, unknown, Alabama, Georgia and Tennessee
• Amphicyclotulus guadeloupensis, Unknown, Guadeloupe
• Angled riffleshell, Epioblasma biemarginata, after 1967, the Cumberland and Tennessee Rivers
• Arc-form pearly mussel, Epioblasma arcaeformis, 1940, the Cumberland and Tennessee Rivers
• Arcuate pearly mussel, Epioblasma flexuosa, unknown, the U.S.
• Bigmouth rocksnail, Leptoxis occultata, unknown, Alabama
• Boulder snail, Athearnia crassa, unknown, Alabama, Georgia, Tennessee, Virginia
• Brown pigtoe, Pleurobema hagleri, unknown, the U.S.
• Cahaba pebblesnail, Clappia cahabensis, 1965, the Cahaba River, Alabama
• Carolina elktoe, Alasmidonta robusta, unknown, the Carolinas
• Channeled pebblesnail, Somatogyrus wheeleri, unknown, Arkansas
• Closed elimia, Elimia clausa, after 1967, Alabama
• Cobble elimia, Elimia vanuxemiana, unknown, Alabama
• Constricted elimia, Elimia impressa, unknown, Alabama
• Coosa elktoe, Alasmidonta mccordi, unknown, Alabama
• Coosa pigtoe, Pleurobema murrayense, unknown, the U.S.
• Coosa rocksnail, Leptoxis showalterii, unknown, the U.S.
• Corded purg, Pyrgulopsis nevadensis, unknown, Nevada
• Eelgrass limpet, Lottia alveus, the 1920s, Labrador to New York
• Elimia gibbera, unknown, Alabama
• Elimia macglameriana, unknown, Alabama and Georgia
• Excised slitshell, Gyrotoma excisa, unknown, Alabama
• Fine-rayed pearly mussel, Epioblasma personata, the early 20th century, Alabama, Indiana, Kentucky, Ohio and Tennessee
• Fish Lake physa, Gyrotoma excisa, unknown, Alabama
• Fusiform elimia, Elimia fusiformis, unknown, Alabama
• Green-blossom pearly mussel, Epioblasma torulosa gubernaculum, the 1980s, the Tennessee River
• Hazel pigtoe, Pleurobema avellanum, unknown, the U.S.
• Hearty elimia, Elimia jonesi, unknown, Alabama
• Highnut, Pleurobema altum, unknown, the U.S.
• High-spired elimia, Elimia hartmaniana, unknown, the U.S.
• Incerticyclus cinereus, unknown, Martinique
• Incerticyclus martinicensis, unknown, Martinique
• Lewis pearly mussel, Epioblasma lewisii, unknown, the Cumberland and Tennessee Rivers
• Leptoxis torrefacta, unknown, the U.S.
• Little flat-top snail, Neoplanorbis tantillus, unknown, Alabama
• Lined pocketbook, Lampsilis binominata, unknown, U.S.
• Longnut, Pleurobema nucleopsis, unknown, the U.S.
• Lyrate rocksnail, Leptoxis lirata, unknown, Alabama
• Maiden rocksnail, Leptoxis formosa, unknown, Alabama and Georgia
• Nearby pearly mussel, Epioblasma propinqua, 1901, the Cumberland and Tennessee Rivers
• Neoplanorbis carinatus, unknown, the U.S.
• Neoplanorbis smithi, unknown, the U.S.
• Neoplanorbis umbilicatus, unknown, the U.S.
• Oachita pebblesnail, Somatogyrus amnicoloides, unknown, Arkansas
• Ochlockonee arcmussel, Alasmidonta wrightiana, unknown, Florida
• Oleacina guadeloupensis, unknown, Guadeloupe
• Olive marstonia, Marstonia olivacea, 1940, Alabama
• Pagoda slitshell, Gyrotoma pagoda, unknown, Alabama
• Pleurodonte desidens, 1834, Martinique
• Pupa elimia, Elimia pupaeformis, unknown, Alabama
• Pygmy elimia, Elimia pygmaea, unknown, Alabama
• Pyramid slitshell, Gyrotoma pyramidata, unknown, Alabama
• Reverse pebblesnail, Somatogyrus alcoviensis, unknown, Georgia
• Ribbed elimia, Elimia laeta, unknown, Alabama
• Ribbed slitshell, Gyrotoma pumila, unknown, Alabama
• Rotund rocksnail, Leptoxis ligata, unknown, Alabama
• Rough-lined elimia, Elimia pilsbryi, unknown, Alabama
• Round slitshell, Gyrotoma walkeri, unknown, Alabama
• Sampson's pearly mussel, Epioblasma sampsonii, unknown, Illinois, Indiana and Kentucky
• Scioto pigtoe, Pleurobema bournianum, unknown, the U.S.
• Shoal sprite, Amphigyra alabamensis, unknown, the U.S.
• Short-spired elimia, Elimia brevis, unknown, Alabama
• Steward's pearly mussel,Epioblasma stewardsonii, unknown, the U.S.
• Stone's pearly mussel, Epioblasma lenior, after 1965, Alabama and Tennessee
• Striate slitshell, Gyrotoma lewisii, unknown, the U.S.
• Striped rocksnail, Leptoxis vittata, unknown, the U.S.
• Thick-lipped pebblesnail, Somatogyrus crassilabris, unknown, Arkansas
• Tombigbee moccasinshell, Medionidus mcglameriae, unknown, the U.S.
• True pigtoe, Pleurobema verum, unknown, Alabama
• Tubercled-blossom pearly mussel, Epioblasma torulosa torulosa, unknown, Canada, Alabama, Illinois, Indiana, Kentucky, Ohio, Tennessee and West Virginia
• Turgid-blossom pearly mussel, Epioblasma turgidula, unknown, the U.S.
• Umbilicate pebblesnail, Clappia umbilicata, 1928, Alabama
• Yellow pigtoe, Pleurobema flavidulum, unknown, the U.S.