- Lampedusa melitensis
- Lamprocystis denticulata
- Lamprocystis fastigata
- Lamprocystis hahajimana
- Lamprocystis hornbosteli
- Lamprocystis misella
- pink mucket
- fine-lined pocketbook
- lined pocketbook
- Lampsilis bracteata
- Lampsilis cardium
- yellow lampmussel
- Lampsilis dolabraeformis
- waccamaw fatmucket
- Lampsilis haddletoni
- higgins' eye pearly mussel
- Lampsilis ornata
- Lampsilis ovata
- orangenacre mucket
- arkansas fatmucket
- neosho mucket
- Lampsilis satura
- Lampsilis splendida
- speckled pocketbook
- alabama lamp naiad
- Lanistes alexandri
- Lanistes bicarinatus
- Lanistes ciliatus
- Lanistes elliptus
- Lanistes farleri
- Lanistes graueri
- Lanistes intortus
- Lanistes nasutus
- Lanistes neavei
- Lanistes neritoides
- Lanistes nyssanus
- Lanistes solidus
- Lanistes stuhlmanni
- Lantzia carinata
- Lasmigona compressa
- carolina heelsplitter
- tennessee heelsplitter
- green floater
- Latiaxis babelis
- Lauria fanalensis
- Lavigera coronata
- Lavigera grandis
- Lavigera nassa
- Lavigera paucicostata
- Leiostyla abbreviata
- Leiostyla callathiscus
- Leiostyla cassida
- Leiostyla cheiligona
- Leiostyla concinna
- Leiostyla corneocostata
- Leiostyla degenerata
- Leiostyla ferraria
- Leiostyla filicum
- Leiostyla fusca
- Leiostyla fuscidula
- Leiostyla gibba
- Leiostyla heterodon
- Leiostyla laevigata
- Leiostyla laurinea
- Leiostyla monticola
- Leiostyla relevata
- Leiostyla simulator
- Leiostyla vermiculosa
- Leiostyla vincta
- birdwing pearlymussel
- Lemniscia calva
- Lemniscia galeata
- Lemniscia michaudi
- Leptachatina lepida
- Leptaxis caldeirarum
- Leptaxis furva
- Leptaxis terceirana
- Leptaxis vetusa
- Leptaxis wollastoni
- Leptichnus bernardi
- Leptinaria strebeliana
- scale shell
- Leptodea ochracea
- Leptoxis ampla
- Anthony's river snail
- agate rocksnail
- oblong rocksnail
- boulder snail
- interrupted rocksnail
- maiden rocksnail
- rotund rocksnail
- lyrate rocksnail
- black mudalia
- knob mudalia
- bigmouth rocksnail
- spotted rocksnail
- plicate rocksnail
- mainstream river snail
- coosa rocksnail
- painted rocksnail
- Leptoxis torrefacta
- smooth rocksnail
- striped rocksnail
- flat pebblesnail
- Letomola barrenensis
- Letomola contortus
- Leuchocharis pancheri
- Leucocharis loyaltiensis
- Leucocharis porphyrocheila
- slab-sided naiad
- Lexingtonia subplana
- Liardetia boninensis
- Liardetia tenuisculpta
- Libera subcavernula
- Libera tumuloides
- Ligumia nasuta
- Ligumia recta
- Limnotrochus thomsoni
- cylindrical lioplax
- armigerous river snail
- knobby rocksnail
- Dutton's river snail
- geniculate river snail
- Jay's river snail
- elk river file snail
- muddy rocksnail
- varicose rocksnail
- Litthabitella elliptica
- Littoraria flammea
- Littoridina gaudichaudii
- Lobaunia danubialis
- Luchuena hachijoensis
- Lutilodix imitratrix
- Lyropupa anceyana
- Lyropupa clathratula
- Lyropupa hawaiiensis
- Lyropupa lyrata
- Lyropupa microthauma
- Lyropupa mirabilis
- Lyropupa perlonga
- Lyropupa prisca
- Lyropupa rhabdota
- Lyropupa scabra
- Lyropupa spaldingi
- Lyropupa sparna
- Lyropupa striatula
- Lyropupa thaanumi
- Lyropupa truncata
- Malacolimax wiktori
- Malarinia calcopercula
- Mandarina anijimana
- Mandarina aureola
- Mandarina chichijimana
- Mandarina exoptata
- Mandarina hahajimana
- Mandarina hirasei
- Mandarina luhuana
- Mandarina mandarina
- Mandarina polita
- Mandarina ponderosa
- Mandarina suenoae
- Spengler's freshwater mussel
- louisiana pearlshell
- alabama pearl shell
- Marginella chalmersi
- Marginella gemma
- Marginella liparozona
- Marginella melvilli
- Martelia tanganyicensis
- Mathewsoconcha belli
- Mautodontha acuticosta
- Mautodontha boraborensis
- Mautodontha ceuthma
- Mautodontha consimilis
- Mautodontha consobrina
- Mautodontha maupiensis
- Mautodontha parvidens
- Mautodontha punctiperforata
- Mautodontha saintjohni
- Mautodontha subtilis
- Mautodontha unilamellata
- Mautodontha zebrina
- alabama moccasinshell
- Medionidus conradicus
- tombigbee moccasinshell
- coosa moccasinshell
- gulf moccasinshell
- ochlockonee moccasinshell
- Medionidus walkeri
- Megalobulimus cardosoi
- Megalobulimus fragilion
- Megalobulimus grandis
- Megalobulimus lopesi
- Megalobulimus parafragilior
- Megalobulimus proclivis
- Melanatria fluminea
- Melanatria madagascarensis
- Melanoides admirabilis
- Melanoides nodicincta
- Melanoides nyassana
- Melanoides pergracilis
- Melanoides polymorpha
- Melanoides pupiformis
- Melanoides truncatelliformis
- Melanoides turritispira
- Melanopsis etrusca
- Meliobba shafferyi
- Meridolum benneti
- Meridolum corneovirens
- Meridolum depressum
- Meridolum marshalli
- Archer's toothed land snail
- Clench's middle-toothed land snail
- jones' middle-toothed land snail
- Mesodontrachia desmonda
- Mesodontrachia fitzroyana
- concentrated snail
- fraternal snail
- Gabb's snail
- prickly pear island snail
- Microstrophia modesta
- Microstrophia nana
- Miratesta celebensis
- Moitessieria corsica
- Moitessieria juvenisanguis
- Moitessieria lineolata
- Moitessieria locardi
- Moitessieria rayi
- Moitessieria rolandiana
- Moitessieria simoniana
- keeled sideband
- shasta sideband
- Monterissa gowerensis
- Montserratina bofilliana
- Mouldingia occidentalis
- Mouldingia orientalis
- Muricopsis mariangelae
- Muricopsis matildae
- Muricopsis principensis
- Mussonena campbelli
- Mutela alata
- Muticaria macrostoma
- Mysorelloides multisulcata
- Nancibella quintalia
- Nanocochlea monticola
- Nanocochlea parva
- Nanocochlea pupoidea
- Napaeus isletae
- Napaeus nanodes
- Napaeus pygmaeus
- pondoland cannibal snail
- tongaland cannibal snail
- Neohoratia minuta
- Neophaedusa spelaeonis
- Neoplanorbis carinatus
- Neoplanorbis smithi
- Neoplanorbis tantillus
- Neoplanorbis umbilicatus
- Neorapana grandis
- Neothauma tanganyicense
- anchialine pool snail
- Neritina cristata
- Neritina manoeli
- Neritina natalensis
- Neritina oweniana
- Neritina rubricata
- Neritina tiassalensis
- Nesopupa alloia
- Nesopupa anceyana
- Nesopupa bacca
- Nesopupa baldwini
- Nesopupa bishopi
- Nesopupa dispersa
- Nesopupa dubitabilis
- Nesopupa eapensis
- Nesopupa forbesi
- Nesopupa infrequens
- Nesopupa kauaiensis
- Nesopupa limatula
- Nesopupa litoralis
- Nesopupa madgei
- Nesopupa newcombi
- Nesopupa oahuensis
- Nesopupa plicifera
- Nesopupa ponapica
- Nesopupa quadrasi
- Nesopupa rodriguezensis
- Nesopupa singularis
- Nesopupa subcentralis
- Nesopupa thaanumi
- Nesopupa turtoni
- Nesopupa waianensis
- Nesopupa wesleyana
- Newcombia canaliculata
- Newcombia cumingi
- Newcombia lirata
- Newcombia perkinsi
- Newcombia pfeifferi
- Newcombia philippiana
- Newcombia sulcata
- Ngairea murphyi
- Ningbingia australis
- Ningbingia bulla
- Ningbingia dentiens
- Ningbingia laurina
- Ningbingia octava
- Ningbingia res
- Nobuea kurodai
- Noctepuna muensis
- Nodipecten magnificus
- Norfolcioconch iota
- Norfolcioconch norfolkensis
- Notopala sublineata
- Obelus despreauxii
- Obovaria jacksoniana
- Obovaria olivaria
- golf stick pearly mussel
- round ebonyshell
- Obovaria subrotunda
- Obovaria unicolor
- Occirhenea georgiana
- Ochthephila spirulina
- Oestophora ortizi
- Offachloritis dryanderensis
- Ogasawarana arata
- Ogasawarana capsula
- Ogasawarana chichijimana
- Ogasawarana comes
- Ogasawarana discrepans
- Ogasawarana habei
- Ogasawarana hirasei
- Ogasawarana metamorpha
- Ogasawarana microtheca
- Ogasawarana nitida
- Ogasawarana ogasawarana
- Ogasawarana optima
- Ogasawarana rex
- Ogasawarana yoshiwarana
- Oleacina guadeloupensis
- Omphalotropis albocarinata
- Omphalotropis carolinensis
- Omphalotropis cheynei
- Omphalotropis cookei
- Omphalotropis costulata
- Omphalotropis elegans
- Omphalotropis elongatula
- Omphalotropis erosa
- Omphalotropis fragilis
- Omphalotropis gracilis
- Omphalotropis guamensis
- Omphalotropis hieroglyphica
- Omphalotropis howeinsulae
- Omphalotropis laevigata
- Omphalotropis laticosta
- Omphalotropis latilabris
- Omphalotropis mutica
- Omphalotropis ochthogyra
- Omphalotropis picta
- Omphalotropis pilosa
- Omphalotropis plicosa
- Omphalotropis quadrasi
- Omphalotropis semicostata
- Omphalotropis striatapila
- Omphalotropis submaritima
- Omphalotropis suteri
- Omphalotropis suturalis
- Omphalotropis tumidula
- Omphalotropis vohimenae
- Opanara altiapica
- Opanara areaensis
- Opanara bitridentata
- Opanara caliculata
- Opanara depasoapicata
- Opanara duplicidentata
- Opanara fosbergi
- Opanara megomphala
- Opanara perahuensis
- Opisthostoma bihamulatum
- Opisthostoma decrespignyi
- Opisthostoma dormani
- Opisthostoma fraternum
- Opisthostoma inornatum
- Opisthostoma jucundum
- Opisthostoma mirabile
- Opisthostoma otostoma
- Opisthostoma perspectivum
- Opisthostoma simplex
- Orangia cookei
- Orangia maituatensis
- Orangia sporadica
- Orcula austriaca
- Orcula fuchsi
- Orcula pseudodolium
- Ordtrachia australis
- Ordtrachia elegans
- Ordtrachia septentrionalis
- boulder pile mountain snail
- vortex banded mountain snail
- lava rock mountain snail
- Oreokera cumulus
- Oreokera nimbus
- Oreomava cannfluviatilus
- Oreomava otwayensis
- Ostodes brazieri
- Ougapia spaldingi
- Oxychilus agostinhoi
- Oxychilus amaltheae
- Oxychilus basajauna
- Oxychilus lineolatus
- Oxychilus oglasicola
- Pachnodus velutinus
- Pachystyla rufozonata
- Palacanthilhiopsis vervierii
- Paladilhia hungarica
- Paladilhia pleurotoma
- Palaina albata
- Palaina dimorpha
- Palaina dohrni
- Palaina doliolum
- Palaina kubaryi
- Palaina moussoni
- Palaina ovatula
- Palaina patula
- Palaina platycheilus
- Palaina pupa
- Palaina pusilla
- Palaina rubella
- Palaina scalarina
- Palaina strigata
- Palaina striolata
- Palaina taeniolata
- Palaina wilsoni
- Palaina xiphidium
- Palaua babelthuapi
- Palaua margaritacea
- Palaua minor
- Palaua ngarduaisi
- Palaua straminea
- Palaua wilsoni
- Palikirus cosmetus
- Palikirus ponapicus
- Palline micramyla
- Palline notera
- Paludinella conica
- Paludinella minima
- Paludinella semperi
- Paludinella vitrea
- paludiscala de oro snail
- Paludomus ajanensis
- Panulena perrugosa
- Papilloderma altonagai
- Papuexul bidwilli
- emerald green snail
- Paradoxa confirmata
- Paradoxa thomensis
- Paraegista apoiensis
- Paramelania damoni
- Paramelania iridescens
- Paramiella incisa
- Paramiella kondoi
- Paravitrea clappi
- Parmacella tenerifensis
- Partula affinis
- Partula approximata
- Partula arguta
- Partula atilis
- Partula attenuata
- moorean viviparous tree snail
- Partula auriculata
- Partula bilineata
- Partula callifera
- Partula calypso
- Partula candida
- Partula castanea
- Partula cedista
- Partula citrina
- Partula clara
- Partula compacta
- Partula crassilabris
- Partula cuneata
- Partula cytherea
- Partula dentifera
- Partula dolichostoma
- Partula dolorosa
- Partula emersoni
- Partula eremita
- Partula exigua
- Partula faba
- Partula filosa
- Partula formosa
- Partula fusea
- Partula garretti
- fat guam partula
- Partula guamensis
- Partula hebe
- Partula hyalina
- Partula imperforata
- Partula jackieburchi
- Partula labrusca
- Partula langfordi
- Partula leptochila
- Partula leucothoe
- Partula levilineata
- Partula levistriata
- Partula lutea
- Partula martensiana
- Partula microstoma
- Partula mirabilis
- Partula mooreana
- Partula nodosa
- Partula otaheitana
- Partula planilabrum
- Partula producta
- Partula protea
- Partula protracta
- Partula radiata
- radiolate partula
- Partula raiatensis
- Partula remota
- Partula robusta
- Partula rosea
- Partula rustica
- Partula sagitta
- mount alifana partula
- Partula salifera
- Partula suturalis
- moorean viviparious tree snail
- Partula thalia
- Partula thetis
- Partula tohiveana
- Partula tristis
- Partula turgida
- Partula umbilicata
- Partula varia
- Partula variabilis
- Partula vittata
- Partulina confusa
- Partulina crassa
- Partulina dolei
- Partulina dubia
- Partulina dwightii
- Partulina fusoidea
- Partulina kaaeana
- Partulina mighelsiana
- Partulina montagui
- Partulina nattii
- Partulina perdix
- Partulina physa
- Partulina porcellana
- Partulina proxima
- Partulina redfieldi
- Partulina semicarinata
- splendid partulina
- Partulina talpina
- Partulina tappaniana
- Partulina terebra
- Partulina tessellata
- Partulina ustulata
- Partulina variabilis
- Partulina virgulata
- gillies' land snail
- Hochstetter's land snail
- woodformed land snail
- ross' land snail
- travers' land snail
- Pasmaditta jungermanniae
- little winged pearly mussel
- Pene galilaea
- Penescosta mathewsi
- Penescosta sororcula
- Perdicella carinella
- Perdicella fulgurans
- Perdicella helena
- Perdicella kuhnsi
- Perdicella maniensis
- Perdicella ornata
- Perdicella zebra
- Perdicella zebrina
- Pernagera gatliffi
- Petasina subtecta
- Phenacolimax atlantica
- Philonesia filiceti
- Philonesia pitcairnensis
- Phrantela annamurrayae
- Phrantela conica
- Phrantela kutikina
- Phrantela pupiformis
- Phrantela richardsoni
- Phrantela umbilicata
- mimic cavesnail
- fish lake physa
- snake river physa snail
- cave physa
- utah physa
- wet rock physa
- Pila occidentalis
- Pila speciosa
- Pillomena aemula
- Pilsbrycharopa tumida
- Pilula praetumida
- Pisidium artifex
- Pisidium fultoni
- Pittoconcha concinna
- new zealand flax snail
- Placostylus cuniculinsulae
- Placostylus eddystonensis
- Placostylus fibratus
- Placostylus porphyrostomus
- Plagigeyeria conilis
- Planilaoma luckmanii
- magnificent ramshorn
- acorn ramshorn
- Platyla foliniana
- Platyla lusitanica
- Platyla maaseni
- Platyla microspira
- Platyla orthostoma
- Platyla peloponnesica
- Plegma caelatura
- Plentusia vendia
- white warty-back pearly mussel
- orange-footed pimpleback mussel
- Plethobasus cyphyus
- highnut
- hazel pigtoe
- Pleurobema beadleianum
- scioto pigtoe
- painted clubshell
- club naiad
- james river spinymussel
- Pleurobema cordatum
- black clubshell
- southern clubshell
- yellow pigtoe
- dark pigtoe
- southern pigtoe
- cumberland pigtoe
- brown pigtoe
- georgia pigtoe
- alabama pigtoe
- flat pigtoe
- coosa pigtoe
- longnut
- tennessee clubshell
- ovate clubshell
- rough pigtoe pearly mussel
- oval pigtoe
- Pleurobema riddellii
- warrior pigtoe
- pyramid pigtoe
- fuzzy pigtoe
- heavy pigtoe
- alabama clubshell
- true pigtoe
- rugged hornsnail
- ringed hornsnail
- spiral hornsnail
- corpulent hornsnail
- shortspire hornsnail
- rough hornsnail
- skirted hornsnail
- upland hornsnail
- telescope hornsnail
- Pleurodonte desidens
- Pleuroxia arcigerens
- Pleuroxia hinsbyi
- Pleuroxia italowiana
- Polygyra hippocrepis
- strange many-whorled land snail
- virginia fringed mountain snail
- Pomatias raricosta
- Ponapella pihapiha
- Popenaias popeii
- Posorites turneri
- Posticobia norfolkensis
- Potamilus alatus
- texas heelsplitter
- fat pocketbook pearly mussel
- alabama heelsplitter
- Potamopyrgus oscitans
- Powelliphanta marchantii
- Pronesopupa acanthinula
- Pronesopupa boettgeri
- Pronesopupa frondicella
- Pronesopupa hystricella
- Pronesopupa incerta
- Pronesopupa lymaniana
- Pronesopupa molokaiensis
- Pronesopupa orycta
- Pronesopupa sericata
- Prototrachia sedula
- Prymnbriareus nimberlinus
- Pseudamnicola anteisensis
- Pseudamnicola klemmi
- Pseudamnicola melitensis
- Pseudocampylaea portosanctana
- Pseudoglessula acutissima
- Pseudoglessula conradti
- Pseudomulleria dalyi
- Pseudopalaina polymorpha
- Pseudospatha tanganyicensis
- Ptychalaea dedecora
- Ptychobranchus fasciolaris
- triangular kidneyshell
- southern kidneyshell
- Ptychobranchus occidentalis
- Ptychobranchus subtentum
- Ptychodon schuppi
- Ptychotrema mazumbiensis
- Ptychotrema usambarense
- Pupilla ficulnea
- Pupilla obliquicosta
- Pupilla pupula
- Pupina brenchleyi
- Pupina complanata
- Pupina coxeni
- Pupina difficilis
- Pupina pfeifferi
- Pupisoma orcula
- Pupisoma sp. nov. 1
- Pupoidopsis hawaiensis
- Pyganodon gibbosa
- Pyrenaearia cotiellae
- Pyrenaearia daanidentata
- Pyrenaearia molae
- Pyrenaearia navasi
- Pyrenaearia oberthueri
- Pyrenaearia organiaca
- Pyrenaearia parva
- Pyrenaearia poncebensis
- Pyrenaearia velascoi
- Pyrgina umbilicata
- ocmulgee marstonia
- duckwater pyrg
- Pyrgulopsis avernalis
- grand wash springsnail
- san bernadino springsnail
- bruneau hot springsnail
- beaver pond marstonia
- chupadera springsnail
- kingman springsnail
- transverse grand pyrg
- crystal spring springsnail
- davis county springsnail
- ash meadows pebblesnail
- fairbanks springsnail
- gila springsnail
- south sierra nevada springsnail
- verde rim springsnail
- idaho springsnail
- elongate-gland springsnail
- naegele springsnail
- oasis valley springsnail
- montezuma well springsnail
- page sprlngsnail
- distal-gland springsnail
- corded purg
- royal marstonia
- olive marstonia
- ozark pyrg
- armored marstonia
- pecos springsnail
- median-gland nevada springsnail
- jackson lake springsnail
- roswell springsnail
- fossil springsnail
- brown springsnail
- new mexico hotspring snail
- huachuca springsnail
- three forks springsnail
- Quadrasiella clathrata
- Quadrasiella mucronata
- Quadrula asperata
- Quadrula couchiana
- rough maple leaf pearly mussel
- Quadrula houstonensis
- cumberland monkey-face pearly mussel
- Quadrula quadrula
- Quadrula refulgens
- Quadrula rumphiana
- appalachian monkey-face pearly mussel
- stirrup shell
- Quadrula tuberosa
- Quincuncina infucata
- false spike
- Quintalia flosculus
- Quintalia stoddartii
- catalina mountain snail
- Radioconus goeldi
- Radioconus riochcoensis
- Radiodiscus amdenus
- Radiodiscus compactus
- Radiodiscus coppingers
- Radiodiscus iheringi
- Ranella olearia
- Ranella parthenopaeum
- Renea bourguignatiana
- Renea gormonti
- Renea moutoni
- Renea paillona
- Renea singularis
- Retinella stabilei
- Reymondia horei
- Reymondia minor
- Reymondia pyramidalis
- Reymondia tanganyicensis
- Rhachis comorensis
- Rhachis sanguineus
- Rhagada gibbensis
- Rhagada harti
- domed ancylid
- wicker ancylid
- Rhophodon problematica
- Rhysoconcha atanuiensis
- Rhysoconcha variumbilicata
- Rhytida clarki
- Roblinella agnewi
- Roimontis tolotomensis
- Ruatara koarana
- Ruatara oparica
- Russatus nigrescens
- Ryssota pachystoma
- Sadleriana pannonica
- short samoan tree snail
- Samoana annectens
- Samoana attenuata
- Samoana conica
- Samoana diaphana
- Samoana solitaria
- Samoana thurstoni
- Scaevatula amancicoi
- Scaevatula pellisserpentis
- Sculptiferussacia clausiliaeformis
- Semotrachia euzyga
- Semotrachia sublevata
- Semotrachia winneckeana
- Semperdon heptaptychius
- Semperdon kororensis
- Semperdon rotanus
- Semperdon uncatus
- Semperdon xyleborus
- Setobaudinia collingii
- Setobaudinia victoriana
- Setomedea nudicostata
- Sheldonia puzeyi
- salamander mussel
- Simulator consetti
- Sinployea canalis
- Sinployea decorticata
- Sinployea harveyensis
- Sinployea kusaieana
- Sinployea otareae
- Sinployea pitcairnensis
- Sinployea planospira
- Sinployea proxima
- Sinployea rudis
- Sinployea tenuicostata
- Sinployea youngi
- Sinumelon bednalli
- Siphonaria compressa
- Sitala mazumbaiensis
- Solatopupa guidoni
- Solatopupa psarolena
- reverse pebblesnail
- oachita pebblesnail
- goldend pebblesnail
- angular pebblesnail
- knotty pebblesnail
- coosa pebblesnail
- thick-lipped pebblesnail
- stocky pebblesnail
- tennessee pebblesnail
- hidden pebblesnail
- ovate pebblesnail
- fluted pebblesnail
- granite pebblesnail
- atlas pebblesnail
- dwarf pebblesnail
- moom pebblesnail
- sparrow pebblesnail
- tallapoosa pebblesnail
- pygmy pebblesnail
- quadrate pebblesnail
- mud pebblesnail
- rolling pebblesnail
- savannah pebblesnail
- opaque pebblesnail
- panhandle pebblesnail
- channeled pebblesnail
- Sonorella allynsmithi
- Sonorella christenseni
- sax xavier talus snail
- Sonorella grahamensis
- Sonorella macrophallus
- franklin mountain talus snail
- Sonorella todseni
- Spathopsis wissmanni
- Spekia coheni
- Spekia zonata
- Spelaeodiscus tatricus
- Sphaerium bequaerti
- Sphaerium stuhlmanni
- Sphaerospira macleayi
- Sphaerospira rockhamptonensis
- Sphaerospira whartoni
- Spirorbula latens
- Spirorbula obtecta
- Spirorbula squalida
- Stagnicola bonnevillensis
- thickshell pondsnail
- Stanleya neritinoides
- Stenotrema hubrichti
- Rich Mountain Slitmouth
- insular birddrop
- sculpin snail
- Stormsia minima
- Streptostyla turgidula
- Streptostyla wani
- Strobilops sp. nov. 1
- Strophitus connasaugaensis
- Strophitus subvexus
- Sturanyella carolinarum
- Sturanyella epicharis
- Suavocallia splendens
- Suboestophora altamirai
- Suboestophora hispanica
- Suboestophora jeresae
- Subulina usambarica
- Subuliniscus arambourgi
- chittenango ovate amber snail
- Succinea guamensis
- Succinea philippinica
- Succinea piratarum
- Succinea quadrasi
- Succinea sanctaehelenae
- Syrnolopsis gracilis
- Syrnolopsis lacustris
- Syrnolopsis minuta
- Tacheocampylaea raspaili
- Tacheocampylaea tacheoides
- Taheitia alata
- Taheitia lamellicosta
- Taheitia mariannarum
- Taheitia parvula
- Taipidon anceyana
- Taipidon marquesana
- Taipidon octolamellata
- Tandonia nigra
- Tanganyicia rufofilosa
- Tasmaphena lamproides
- bliss rapid snail
- Tayloria amaniensis
- Tayloria angustistriata
- Tayloria hyalinoides
- Teinostoma fernandesi
- Teinostoma funiculatum
- Tengchiena euroxestus
- Thaanumella angulosa
- Thaanumella cookei
- Thapsia buraensis
- Thapsia grandis
- Thapsia microsculpta
- Thapsia snelli
- Thapsia usambarensis
- Theba arinagae
- Theodoxus maresi
- Theodoxus numidicus
- Theskelomensor creon
- Thomea newtoni
- Thyrophorella thomensis
- Tiphobia horei
- Tomicha cawstoni
- Tomicha natalensis
- Tomicha rogersi
- Tomigerus gibberulus
- Tomigerus turbinatus
- Tornatellinops ponapensis
- Tornelasmias capricorni
- Torresitrachia crawfordi
- Torresitrachia funium
- Torresitrachia thedana
- pale lilliput naiad
- dlinza forest pinwheel
- Trachycystis haygarthi
- Trachycystis placenta
- Trichia biconica
- Trichia caelata
- Trichia gramnicola
- Trichia oreinos
- Trichotoxon martensi
- Tricula montana
- boring clam
- southern giant clam
- Tridacna rosewateri
- tevoro clam
- western three-toothed land snail
- flat-spired three-toothed snail
- Trissexodon constrictus
- Trochidrobia inflata
- Trochidrobia minuta
- Trochidrobia punicea
- Trochidrobia smithi
- Trochochlamys ogasawarana
- Trochogyra leptotera
- Trochoidea betulonensis
- Trochoidea claudinae
- Trochoidea gharlapsi
- Trochoidea jimenensis
- Trochoidea molinae
- Trochoidea montserratensis
- Trochoidea picardi
- Trochoidea pseudojacosta
- Trochoidea zaharensis
- Trochomorpha apia
- Trochomorpha approximata
- Trochomorpha carolinae
- Trochomorpha conoides
- Trochomorpha contigua
- Trochomorpha kuesteri
- Trochomorpha melvillensis
- Trochomorpha nigritella
- Trochozonites usambarensis
- Tropidophora articulata
- Tropidophora carinata
- Tropidophora deburghiae
- Tropidophora desmazuresi
- Tropidophora michaudi
- Tropidophora semilineata
- Tropidoptera heliciformis
- Trukcharopa trukana
- Truncatella guerinii
- Truncatellina arcyensis
- Truncatellina atomus
- diamond y springsnail
- alamosa springsnail
- sportingoods tryonia
- Brune's tryonia
- Cheatum's snail
- grated tryonia
- point of rocks tryonia
- minute tryonia
- gila tryonia
- california brackish water snail
- Koster's tryonia
- quitabaquito tryonia
- amargossa tryonia
- Tubuaia fosbergi
- tulotoma
- Turgenitubulus aslini
- Turgenitubulus costus
- Turgenitubulus depressus
- Turgenitubulus foramenus
- Turgenitubulus opiranus
- Turgenitubulus pagodula
- Turgenitubulus tanmurrana
- Tyrrheniella josephi
- Unio cariei
- Unio turtoni
- Vallonia allamanica
- Vallonia declivis
- Vallonia enniensis
- Vallonia suevica
- utah roundmouth snail
- Valvata virens
- alabama vertigo
- Vertigo arthuri
- Vertigo geyerii
- Vertigo hebardi
- Vertigo hubricti
- Vertigo occulta
- Vertigo ovata
- Vertigo paradoxa
- karok hesperion
- Victaphanta atramentaria
- Victaphanta compacta
- Victodrobia burni
- Victodrobia elongata
- Victodrobia millerae
- Victodrobia victoriensis
- Videna electra
- Videna oleacina
- Videna pagodula
- Videna pumila
- Vidumelon wattii
- purple bean
- cumberland bean pearly mussel
- Vitrea inae
- Vitrea pseudotrolli
- Vitrea striata
- Vitrinula chaunax
- Vitrinula chichijimana
- Vitrinula hahajimana
- Viviparus acerosus
- Volvarina insulana
- Westraltrachia alterna
- Westraltrachia inopinata
- Westraltrachia lievreana
- Westraltrachia porcata
- Westraltrachia recta
- Westraltrachia subtila
- Westraltrachia turbinata
- Westralunio carteri
- Wrayanna soluta
- Xenodiscula taintori
- plain cactus snail
- wreathed cactus snail
- bicolor cactus snail
- Xerosecta adolfi
- Xerosecta giustii
- Zilchogyra paulistana
- Zingis radiolata
- Zonites anaphiensis
- Zonitoides jaccetanicus
- Zospeum biscaiense
