The non-marine

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s of

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

— a part of the molluscan fauna of the state in the

Northwestern United States The Northwestern United States, also known as the American Northwest or simply the Northwest, is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, Idaho, Montana and Wyoming ...

. The non-marine mollusks of Montana consist of land snails and slugs as well as freshwater snails, freshwater mussels and freshwater clams.

Species

A number of species of non-marine molluscs are found in the wild in Montana. ;Gastropods There at least 155 species of

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

s found in Montana. Some of these species are exotics (not native to Montana) and some species have been designated as ''Species of Concern''. ;Freshwater bivalves There are at least 42 species of

freshwater bivalve Freshwater bivalves are molluscs of the order (biology), order Bivalvia that inhabit freshwater ecosystems. They are one of the two main groups of freshwater molluscs, along with freshwater snails. The majority of bivalve molluscs are saltwater ...

s known in

. The

Montana Department of Fish, Wildlife and Parks The Montana Department of Fish, Wildlife and Parks (MFWP) is a government agency in the executive branch state of Montana in the United States with responsibility for protecting sustainable fish, wildlife, and state-owned park resources in Monta ...

has identified a number of bivalve species as ''Species of Concern''.

List of non-marine molluscs

Freshwater gastropods

Freshwater gastropods in Montana include:

Bithyniidae Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha.Bouchet, P.; Gofas, S. (2015). Bithyniidae Gray, 1857. In: MolluscaBase (2015). Accessed through: World Register of Ma ...

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Bithynia tentaculata ''Bithynia tentaculata'', common names the mud bithynia or common bithynia, or faucet snailKipp R. M. & Benson A. (2008). ''Bithynia tentaculata''. United States Geological Survey, USGS Nonindigenous Aquatic Species Database, Gainesville, FL. ht ...

Thiaridae Thiaridae, common name thiarids or trumpet snails, is a family of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the superfamily Cerithioidea.MolluscaBase eds. (2021). MolluscaBase. Thiaridae Gill, 1871 (1823). Acce ...

* ''

Melanoides tuberculata The red-rimmed melania (''Melanoides tuberculata''), also known as the Malayan livebearing snail or Malayan/Malaysian trumpet snail (often abbreviated to MTS by aquarists), is a species of freshwater snail with an operculum, a parthenogenetic, ...

Valvatidae ''Valvatidae'', the valve snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks. Taxonomy The family Valvatidae has no subfamilies (according to the taxonomy of the Gastropoda by Bouche ...

* '' Valvata lewisi'' * ''

Valvata humeralis ''Valvata humeralis'' is a species of gastropod belonging to the family Valvatidae ''Valvatidae'', the valve snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks. Taxonomy The family ...

'' * ''

Valvata sincera ''Valvata sincera'', common name the mossy valvata is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Valvatidae ''Valvatidae'', the valve snails, is a taxonomic family of very sm ...

'' * '' Valvata tricarinata''

Hydrobiidae Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum, in the order Littorinimorpha.MolluscaBase eds. (2024). MolluscaBase. Hydrobiidae W. Stimpson, 1865. ...

* '' Pyrgulopsis bedfordensis'' * '' Fluminicola fuscus'' * '' Probythinella emarginata'' * '' Potamopyrgus antipodarum'' * '' Colligyrus greggi'' * '' Amnicola limosa'' * an undescribed species of ''Amnicola'', currently known as "Lake Amnicola" or "''Amnicola'' sp. 1"

Acroloxidae Acroloxidae, commonly known as river limpets, are a Taxonomy (biology), taxonomic family of very small, freshwater snails, Aquatic animal, aquatic pulmonate gastropod limpet-like mollusks with a simple flattened conical gastropod shell, shell in ...

* '' Acroloxus coloradensis'' Lymnea auricularia1pl

Lymnaeidae Lymnaeidae, common name the pond snails, is a Taxonomy (biology), taxonomic family (biology), family of small to large air-breathing freshwater snails, Aquatic animal, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila (cl ...

* '' Stagnicola apicina'' * ''

Radix auricularia In a positional numeral system, the radix (radices) or base is the number of unique digits, including the digit zero, used to represent numbers. For example, for the decimal system (the most common system in use today) the radix is ten, becaus ...

'' * '' Fossaria dalli'' * '' Stagnicola elrodi'' * '' Fossaria obrussa'' * '' Stagnicola elrodiana'' * '' Fossaria humilis'' * '' Stagnicola elodes'' * ''

Pseudosuccinea columella ''Pseudosuccinea columella'', the American ribbed fluke snail, is a species of air-breathing freshwater snail, an Aquatic animal, aquatic pulmonate gastropod mollusk in the family Lymnaeidae, the pond snails. This snail is an intermediate host f ...

'' * ''

Stagnicola montanensis ''Stagnicola'' can refer to: * ''Stagnicola'' (fungus), a fungus genus * ''Stagnicola'' (gastropod), a freshwater snail genus {{Genus disambiguation ...

'' * '' Fossaria bulimoides'' * ''

Fossaria parva ''Galba'' is a genus of small air-breathing freshwater snails, Aquatic animal, aquatic pulmonate gastropod mollusks in the family Lymnaeidae, the pond snails.Bouchet, P. (2014). Galba Schrank, 1803. Accessed through: World Register of Marine Spec ...

'' * '' Fossaria modicella'' * '' Fisherola nuttalli'' * ''

Lymnaea stagnalis ''Lymnaea stagnalis'', common name, better known as the great pond snail, is a species of large air-breathing freshwater snail, an Aquatic animal, aquatic pulmonate gastropod mollusk in the family (biology), family Lymnaeidae. The great pond sn ...

'' * ''

Stagnicola traski ''Stagnicola'' can refer to: * ''Stagnicola'' (fungus), a fungus genus * ''Stagnicola'' (gastropod), a freshwater snail genus {{Genus disambiguation ...

'' * '' Stagnicola catascopium'' * '' Stagnicola caperata''

Physidae Physidae, common name, commonly called the bladder snails, is a family (biology), family of small air-breathing freshwater snails, Aquatic animal, aquatic pulmonate gastropod molluscs in the superfamily Lymnaeoidea.MolluscaBase eds. (2021). Mol ...

* '' Physella vinosa'' * ''

Physa skinneri ''Physa skinneri'', common name the glass physa, is a species of freshwater snail, an aquatic gastropod mollusc in the family Physidae. Description The shell of ''Physa skinneri'' is thin, narrowly ovoid, to ovoid-fusiform, with an obtusely roun ...

'' * ''

Aplexa elongata ''Sibirenauta elongata'' is a species of gastropods belonging to the family Physidae Physidae, common name, commonly called the bladder snails, is a family (biology), family of small air-breathing freshwater snails, Aquatic animal, aquatic p ...

'' * ''

Physa megalochlamys ''Physa megalochlamys'' is a species of gastropod belonging to the family Physidae Physidae, common name, commonly called the bladder snails, is a family (biology), family of small air-breathing freshwater snails, Aquatic animal, aquatic pul ...

'' * '' Physa jennessi'' * ''

Physella acuta ''Physella acuta'' is a species of small, left-handed or sinistral, air-breathing freshwater snail, an Aquatic animal, aquatic gastropod mollusk in the family Physidae. Common names include European physa, tadpole snail, bladder snail, and acute ...

'' * '' Physella virgata'' * ''

Physella propinqua ''Physella'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. These snails eat algae, diatoms and other detritus. Shell description Snails in the famil ...

'' * ''

Physella columbiana ''Physella'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. These snails eat algae, diatoms and other detritus. Shell description Snails in the fami ...

'' * ''

Physella gyrina ''Physella gyrina'', common name the "tadpole physa", is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Physidae. Shell description Snails in the family Physi ...

'' * ''

Physella lordi ''Physella'' is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. These snails eat algae, diatoms and other detritus. Shell description Snails in the fami ...

'' * ''

Physella zionis The Wet rock physa, scientific name ''Physella zionis'', is a species of freshwater snail, an aquatic pulmonate gastropod mollusc in the family Physidae, the bladder snails. This species is endemic to two connected canyons, Zion Canyon and Order ...

Planorbidae Planorbidae, common name the ramshorn snails or ram's horn snails, is a family (biology), family of air-breathing freshwater snails, Aquatic animal, aquatic pulmonate gastropod Mollusca, molluscs. Unlike most molluscs, the blood of ram's horn sn ...

* '' Gyraulus parvus'' * '' Menetus opercularis'' * '' Gyraulus circumstriatus'' * '' Planorbella pilsbryi'' * '' Gyraulus deflectus'' * ''

Planorbella trivolvis ''Planorbella trivolvis'' is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral or left-coiling shells. Description All sp ...

'' * '' Planorbula campestris'' * '' Promenetus exacuous megas'' * '' Planorbella subcrenata'' * '' Promenetus exacuous'' * ''

Gyraulus crista ''Armiger crista'', commonly known as the Nautilus ramshorn, is a minute species of freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. Distribution The distribution of this species is Hola ...

'' * '' Planorbula armigera'' * '' Helisoma anceps'' * '' Promenetus umbilicatellus'' * '' Ferrissia rivularis'' * '' Ferrissia fragilis'' * '' Ferrissia parallelus''

Land gastropods

Land gastropods in Montana include:

Succineidae Succineidae are a family of small to medium-sized, air-breathing land snails (and slug Slug, or land slug, is a common name for any apparently shell-less Terrestrial mollusc, terrestrial gastropod mollusc. The word ''slug'' is also often ...

* '' Catinella rehderi'' * '' Catinella vermeta'' * '' Oxyloma decampi'' * '' Oxyloma gouldi'' * '' Oxyloma haydeni'' * '' Oxyloma missoula'' * '' Oxyloma nuttallianum'' * '' Oxyloma retusum'' * '' Succinea grosvenori'' Arion

Arionidae Arionidae, common name the "roundback slugs" or "round back slugs" are a taxonomic family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Arionoidea. Distribution The distribution of this family of s ...

* ''

Arion ater The black slug (also known as black arion, European black slug, or large black slug), ''Arion ater'', is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs. Many land slugs lack external shells, having a vestigi ...

'' * ''

Arion circumscriptus ''Arion circumscriptus'', common name brown-banded arion, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae. It is commonest in woodland, occurring across most of Europe, except for more so ...

'' * ''

Arion distinctus ''Arion distinctus'' is a species of air-breathing land slug in the family (biology), family Arionidae, sometimes known as the roundback slugs. It is a terrestrial molluscs, terrestrial pulmonate gastropod mollusc. Several common name, vernacular ...

'' * ''

Arion fasciatus ''Arion fasciatus'', also known by its common name the Orange-banded Arion, is a species of air-breathing, completely shell-less, land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the round-back slugs. The species was ...

'' * ''

Arion intermedius ''Arion intermedius'' is a species of land slug in the family Arionidae, the roundback slugs. It is known commonly as the hedgehog slug,Arion rufus The red slug (''Arion rufus''), also known as the large red slug,Arion subfuscus ''Arion subfuscus'' is a species of land slug. It forms a species complex with '' Arion fuscus''. It is native to Eurasia, and has been introduced to eastern North America North America is a continent in the Northern Hemisphere, North ...

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Hemphillia camelus ''Hemphillia camelus'' is a species of air-breathing land slugs, terrestrial pulmonate gastropod molluscs in the family Binneyidae Binneyidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily ...

'' * ''

Hemphillia danielsi ''Hemphillia danielsi'', the marbled jumping-slug, is a species of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Binneyidae Binneyidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod ...

'' * '' Kootenaia burkei'' * '' Magnipelta mycophaga'' * '' Prophysaon andersoni'' * '' Prophysaon humile'' * '' Udosarx lyrata'' - with subspecies: ''Udosarx lyrata lyrata'' and ''Udosarx lyrata russelli'' * '' Zacoleus idahoensis'' Megomphicidae * '' Polygyrella polygyrella''

Vertiginidae Vertiginidae, common name the whorl snails, is a family of small, air-breathing land snails, terrestrial pulmonate gastropod molluscs or micromollusks in the superfamily Pupilloidea. Distribution The distribution of the Vertiginidae is in the ...

* ''

Columella columella ''Columella columella'' is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Truncatellinidae, the vertigo snails and allies. This species is not listed in the IUCN red list and not evaluated (N ...

'' * ''

Columella edentula ''Columella edentula'', common name the "toothless column snail", is a species of very small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Truncatellinidae. Description The 2.5-3 (-3.5) mm. s ...

'' * '' Gastrocopta armifera'' * '' Gastrocopta holzingeri'' * '' Gastrocopta pentodon'' * '' Vertigo binneyana'' * '' Vertigo concinnula'' * '' Vertigo cristata'' * '' Vertigo elatior'' * '' Vertigo gouldi'' * '' Vertigo modesta'' * ''

Vertigo ovata ''Vertigo ovata'', common name the ovate vertigo, is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.Marshall, B. (2014). Vertigo ovata (Say, 1822). Accessed th ...

Pupillidae Pupillidae is a family of mostly minute, air-breathing, land snails, terrestrial pulmonate gastropod mollusks or micromollusks in the superfamily Pupilloidea.MolluscaBase eds. (2021). MolluscaBase. Pupillidae W. Turton, 1831. Accessed through: ...

* '' Pupilla blandi'' * '' Pupilla hebes'' * ''

Pupilla muscorum ''Pupilla muscorum'', common name, commonly known as the Moss Chrysalis snail or widespread column, is a species of small air-breathing land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk or micromollusk in the family Pupi ...

'' * '' Pupilla syngenes''

Discidae Discidae is a taxonomic family of small air-breathing land snails, terrestrial gastropod mollusks in the superfamily Punctoidea. Genera The family Discidae has no subfamilies. Genera within the family Discidae include: * '' Anguispira'' Morse, ...

* '' Anguispira kochi'' * '' Discus whitneyi'' * '' Discus brunsoni'' * '' Discus shimekii'' Limax maximus 5

Limacidae Limacidae, also known by their common name the keelback slugs, are a taxonomic family of medium-sized to very large, air-breathing land slugs, terrestrial pulmonate gastropod molluscs in the superfamily Limacoidea. Distribution The distributio ...

* ''

Limax maximus ''Limax maximus'' (literally, "biggest slug"), known by the common names great grey slug and leopard slug, is a species of slug in the family Limacidae, the keeled slugs.Marshall, B. (2014). Limax maximus Linnaeus, 1758. Accessed through: World ...

Agriolimacidae ''Agriolimacidae'' is a family of small and medium-sized land slugs, or shell-less snails, terrestrial pulmonate gastropod mollusks. Distribution Distribution of Limacidae is Holarctic, this include: Nearctic, western Palearctic and eastern P ...

* ''

Deroceras laeve ''Deroceras laeve'', the marsh slug (or meadow slug), is a species of small air-breathing land slug, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Agriolimacidae. Distribution The distribution of ''Deroceras laeve ...

'' * ''

Deroceras panormitanum ''Deroceras panormitanum'' is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Agriolimacidae. ''Deroceras panormitanum'' ''sensu stricto'' ("in the strict sense") is common on Sicily and Malta, but ...

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Deroceras reticulatum ''Deroceras reticulatum'', common names the "grey field slug", "grey garden slug", and "milky slug", is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Agriolimacidae. This species is an impor ...

Oxychilidae Oxychilidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Gastrodontoidea. Distribution The distribution of Oxychilidae includes the Nearctic, western-Palearctic, eastern-Pale ...

* ''

Nesovitrea electrina ''Nesovitrea'' is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Oxychilidae, the glass snails. Species Species within the genus ''Nesovitrea'' include: * ''Nesovitrea binneyana'' * ''Nesovitrea dal ...

'' * ''

Nesovitrea binneyana ''Nesovitrea binneyana'', common name the blue glass snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Oxychilidae, the glass snails. This species is named in honor of the American malacolo ...

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Oxychilus draparnaudi ''Oxychilus draparnaudi'', or Draparnaud's glass snail, is a species of small land snail, a Terrestrial molluscs, terrestrial pulmonate gastropod mollusc in the family Oxychilidae, the glass snails. Description ''Oxychilus draparnaudi'' is lar ...

'' * '' Oxychilus alliarius''

Gastrodontidae Gastrodontidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Gastrodontoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).MolluscaBase eds. (2020). MolluscaBas ...

* '' Striatura pugetensis'' * ''

Zonitoides arboreus ''Zonitoides arboreus'', commonly known as the quick gloss snail, is a species of small air-breathing land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Gastrodontidae. Distribution The native distribution ...

'' * ''

Zonitoides nitidus ''Zonitoides nitidus'' (sometimes ''Zonitoides nitida''), also known as the shiny glass snail or black gloss, is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Gastrodontidae. It is the type ...

Pristilomatidae Pristilomatidae is a taxonomic family of air-breathing land snails, terrestrial gastropod molluscs in the superfamily Gastrodontoidea. According to the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi these snails belong to the "limacoid ...

* ''

Hawaiia minuscula ''Hawaiia minuscula'', common name the minute gem or minute gem snail, is a species of very small air-breathing land snail, a Terrestrial molluscs, terrestrial pulmonate gastropod mollusk or micromollusk in the family Pristilomatidae. Distribut ...

'' * '' Pristiloma arcticum'' * '' Pristiloma chersinella'' * '' Pristiloma wascoense''

Vitrinidae Vitrinidae is a family (biology), family of small, air-breathing land snails and semi-slugs, terrestrial molluscs, terrestrial pulmonate gastropod mollusc, mollusks in the superfamily Limacoidea (according to the Taxonomy of the Gastropoda (Bouc ...

* ''

Vitrina pellucida ''Vitrina pellucida'' is species of small land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Vitrinidae, the glass snails.MolluscaBase eds. (2023). MolluscaBase. Vitrina pellucida (O. F. Müller, 1774). Acce ...

Euconulidae Euconulidae is a taxonomic family of minute, air-breathing land snails, terrestrial pulmonate gastropod mollusks or micromollusks in the superfamily Trochomorphoidea. This land snail family is closely allied to the Zonitidae, the glass snails ...

* ''

Euconulus fulvus ''Euconulus fulvus'' is a species of very small, air-breathing land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Euconulidae, the hive snails. Description For terms see gastropod shell The 2.0-2.5 x 2.8-3 ...

Haplotrematidae Haplotrematidae is a Taxonomy (biology), taxonomic family (biology), family of predatory air-breathing land snails, terrestrial molluscs, terrestrial pulmonate gastropod mollusks in the superfamily Haplotrematoidea.MolluscaBase eds. (2021). Mollu ...

* '' Haplotrema vancouverense''

Oreohelicidae Oreohelicidae is a family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Anatomy In this famil ...

* '' Oreohelix alpina'' * '' Oreohelix amariradix'' * '' Oreohelix carinifera'' * '' Oreohelix elrodi'' * '' Oreohelix haydeni'' * '' Oreohelix pygmaea'' * '' Oreohelix strigosa'' - with subspecies: ''Oreohelix strigosa berryi'' and ''Oreohelix strigosa depressa'' * ''

Oreohelix subrudis ''Oreohelix subrudis'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Oreohelicidae Oreohelicidae is a family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropo ...

'' * '' Oreohelix yavapai'' - with subspecies: ''Oreohelix yavapai mariae''

Polygyridae Polygyridae is a family (biology), family of air-breathing land snails, terrestrial molluscs, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.MolluscaBase eds. (2021). MolluscaBase. Polygyridae Pilsbry, 1895. Accessed thro ...

* '' Allogona ptychophora'' * ''

Cryptomastix mullani ''Cryptomastix'' is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Polygyridae. These snails cannot be differentiated from related polygyrids solely on the basis of their shell characters. Instead, t ...

'' * ''

Cryptomastix sanburni ''Cryptomastix'' is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Polygyridae. These snails cannot be differentiated from related polygyrids solely on the basis of their shell characters. Instead, t ...

Cochlicopidae Cochlicopidae is a taxonomic family of small, air-breathing, land snails, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea. Anatomy In this family, the number of haploid chromosomes lies between 26 and 30 (according to the ...

* ''

Cochlicopa lubrica ''Cochlicopa lubrica'' is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Cochlicopidae.MolluscaBase eds. (2020). MolluscaBase. Cochlicopa lubrica (O. F. Müller, 1774). Accessed through: World ...

Charopidae Charopidae is a Taxonomy (biology), taxonomic family (biology), family of small air-breathing land snails (and semi-slugs such as ''Otoconcha dimidiata''), terrestrial molluscs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoi ...

* '' Radiodiscus abietum''

Punctidae Punctidae, common name the "dot snails" or "pinhead snails", is a family (biology), family of small air-breathing land snails, terrestrial molluscs, terrestrial pulmonate gastropod mollusks or micromollusks in the informal group Sigmurethra (acco ...

* '' Paralaoma caputspinulae'' * '' Punctum randolphi'' * ''

Punctum californicum Punctum, plural puncta, adjective punctate, is an anatomical term for a sharp point or tip. It may also refer to: Medical * Lacrimal punctum, a minute opening on the margins of the eyelids that collect tears produced by the lacrimal glands *Bli ...

'' * ''

Punctum minutissimum ''Punctum minutissimum'' is a species of small air-breathing land snail, a terrestrial animal, terrestrial pulmonate gastropod mollusk in the family Punctidae, the dot snails. Shell description The shell of ''Punctum minutissimum'' is slightly ...

Thysanophoridae Thysanophoridae is a family of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the superfamily Helicoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). These are common woodland snails of North ...

* ''

Microphysula ingersolli ''Microphysula'' is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Thysanophoridae. Species Species in the genus ''Microphysula'' include: * ''Microphysula cookei'' (Pilsbry, 1922) - Vancouver snai ...

Valloniidae Valloniidae is a taxonomic family of small and minute, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea.MolluscaBase eds. (2020). MolluscaBase. Valloniidae Morse, 1864. Accessed through: World ...

* '' Vallonia albula'' * ''

Vallonia costata ''Vallonia costata'' is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Valloniidae.MolluscaBase eds. (2023). MolluscaBase. Vallonia costata (O. F. Müller, 1774). Accessed through: World Regis ...

'' * '' Vallonia cyclophorella'' * ''

Vallonia gracilicosta ''Vallonia gracilicosta'', common name the multirib vallonia or multiribbed vallonia, is a species of very small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Valloniidae. Subspecies The subspecies, ''Vallon ...

'' * ''

Vallonia perspectiva ''Vallonia perspectiva'' or ''thin-lip vallonia'' is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs ...

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Vallonia pulchella ''Vallonia pulchella'', common name the lovely vallonia, is a species of very small air-breathing land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Valloniidae.MolluscaBase eds. (2023). MolluscaBase. Vallon ...

'' * '' Zoogenetes harpa''

Freshwater bivalves

Freshwater bivalves in Montana include:

Margaritiferidae Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve molluscs in the order Unionida. Text may have been copied from this source, which is available under Attribution 4.0 International (CC BY 4.0)licence. It is the ...

* '' Margaritifera falcata''

Unionidae The Unionidae are a Family (biology), family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids. The range of distribution for this family is world-wide. It is a ...

* '' Lampsilis siliquoidea'' * '' Lasmigona complanata'' * ''

Ligumia recta ''Ligumia recta'' is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. MolluscaBase eds. (2021). MolluscaBase. Ligumia recta (Lamarck, 1819). Accessed through: World Register of Marine Species ...

'' * '' Pyganodon grandis'' * ''

Quadrula quadrula ''Quadrula quadrula'', the mapleleaf, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. The thick shell is about as broad as it is long with heavy hinge teeth. The outside may be yellowish ...

Sphaeriidae Sphaeriidae is a family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, ...

* ''

Musculium lacustre ''Sphaerium lacustre'', also known as lake fingernail clam, is species of small freshwater clam, an aquatic animal, aquatic bivalve mollusc in the family Sphaeriidae, the fingernail clams and pea clams. Description The 8–11 mm. shell is o ...

'' * '' Musculium partumeium'' * '' Musculium securis'' * ''

Musculium transversum ''Sphaerium transversum'' is a species of freshwater bivalve from the family Sphaeriidae. Distribution and conservation status * Not listed in IUCN red list The International Union for Conservation of Nature (IUCN) Red List of Threatened ...

'' * '' Pisidium adamsi'' * '' Pisidium arbortivum'' * ''

Pisidium casertanum ''Pisidium casertanum'', the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae. Description The shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations. T ...

'' * '' Pisidium compressum'' * '' Pisidium conventus'' * '' Pisidium fallax'' * '' Pisidium ferrugineum'' * '' Pisidium idahoense'' * '' Pisidium imbecille'' * '' Pisidium insigne'' * ''

Pisidium lilljeborgii ''Pisidium lilljeborgii'' is a species of freshwater bivalve from the family Sphaeriidae. Description A moderately swollen (tumid), trapezoidal shell. The umbos are just behind the mid point and described as fairly narrow. The surface (periostra ...

'' * '' Pisidium milium'' * '' Pisidium nitidum'' * ''

Pisidium obtusale ''Pisidium obtusale'' is a species of freshwater bivalve from family Sphaeriidae. Description The 2.5–3.5mm. shell is very tumid (swollen). It is an angular-oval shape with broad, rounded umbos which are behind the midpoint. The surface (perio ...

'' * '' Pisidium ovum'' * '' Pisidium roperi'' * '' Pisidium rotundatum'' * '' Pisidium scutulatum'' * '' Pisidium subtruncatum'' * '' Pisidium variabile'' - with subspecies: ''Pisidium variabile magnum'' * '' Pisidium ventricosum'' * '' Pisidium walkeri'' * '' Sphaerium fabale'' * ''

Sphaerium nitidum ''Sphaerium nitidum'' is a species of mollusc belonging to the family Sphaeriidae. Its native range is Subarctic The subarctic zone is a region in the Northern Hemisphere immediately south of the true Arctic, north of hemiboreal regions ...

'' * '' Sphaerium occidentale'' * '' Sphaerium patella'' * ''

Sphaerium rhomboideum ''Sphaerium rhomboideum'', the rhomboid fingernailclam, is a species of freshwater clams in the family Sphaeriidae Sphaeriidae is a family Family (from ) is a Social group, group of people related either by consanguinity (by recognized ...

'' * '' Sphaerium simile'' * '' Sphaerium striatinum'' * '' Sphaerium sulcatum'' * '' Sphaerium tenue''

Species

List of non-marine molluscs

Freshwater gastropods

Land gastropods

Freshwater bivalves

See also

References

Further reading