HydrobiidaeW
Hydrobiidae

Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum; they are in the order Littorinimorpha.

AlzoniellaW
Alzoniella

Alzoniella is a genus of minute freshwater spring snails, aquatic gastropod mollusks or micromollusks in the family Hydrobiidae.

Alzoniella slovenicaW
Alzoniella slovenica

Alzoniella slovenica is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae, which are sometimes known as the snouted water snails.

Amnicola limosusW
Amnicola limosus

Amnicola limosus, common name the mud amnicola, is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.

BelgrandiellaW
Belgrandiella

Belgrandiella is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

Belgrandiella parreyssiiW
Belgrandiella parreyssii

Belgrandiella parreyssi is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to Austria where it is found only in one thermal spring at Bad Voeslau, south of Vienna. Due to man made changes of the habitat the population has been decreasing rapidly since the 1970s.

Belgrandiella wawraiW
Belgrandiella wawrai

Belgrandiella wawrai is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to Austria.

Ecrobia truncataW
Ecrobia truncata

Ecrobia truncata, common name the truncated marsh hydrobia or minute hydrobia, is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.

GraecoanatolicaW
Graecoanatolica

Graecoanatolica is a genus of small freshwater snails, aquatic gastropod mollusks in the family Hydrobiidae.

Graecoanatolica macedonicaW
Graecoanatolica macedonica

Graecoanatolica macedonica is an extinct species of small freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae.

GrazianaW
Graziana

Graziana is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.

HauffeniaW
Hauffenia

Hauffenia is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.

Hauffenia sp. nov.W
Hauffenia sp. nov.

Hauffenia sp. nov. is an as yet undescribed species of freshwater snail that lives underground, an aquatic gastropod mollusk in the family Hydrobiidae. This species is found in Slovakia.

HydrobiaW
Hydrobia

Hydrobia is a genus of very small brackish water snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

Hydrobia acutaW
Hydrobia acuta

Hydrobia acuta is a species of very small (4-6mm.) brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

IslamiaW
Islamia

Islamia is a genus of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

LittoridinopsW
Littoridinops

Littoridinops is a genus of very small aquatic snails, operculate gastropod mollusks in the family Hydrobiidae.

Littoridinops monroensisW
Littoridinops monroensis

Littoridinops monroensis is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.

MarstoniaW
Marstonia

Marstonia is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

Marstonia comalensisW
Marstonia comalensis

Marstonia comalensis is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae. It is found in south central Texas, United States.

Marstonia scalariformisW
Marstonia scalariformis

Marstonia scalariformis, previously known as Pyrgulopsis scalariformis, common name the moss pyrg, is a species of freshwater snail with a gill and an operculum, aquatic gastropod mollusk in the family Hydrobiidae.

Mercuria (gastropod)W
Mercuria (gastropod)

Mercuria is a genus of small brackish water snails or freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

Mercuria similisW
Mercuria similis

Mercuria similis is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

Mexithauma quadripaludiumW
Mexithauma quadripaludium

Mexithauma quadripaludium is a species of freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae.

NavalisW
Navalis

Navalis is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the Hydrobiidae family.

New Zealand mud snailW
New Zealand mud snail

The New Zealand mud snail is a species of very small freshwater snail with a gill and an operculum. This aquatic gastropod mollusk is in the family Tateidae.

OhridohauffeniaW
Ohridohauffenia

Ohridohauffenia is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Hydrobiidae, the river snails.

PeringiaW
Peringia

Peringia is a genus of very small snails with gills and an operculum, gastropod mollusks in the family Hydrobiidae.

Peringia ulvaeW
Peringia ulvae

Peringia ulvae, common name the Laver spire shell or mudsnail, is a European species of very small aquatic snail with gills and an operculum, a gastropod mollusk in the family Hydrobiidae.

PseudamnicolaW
Pseudamnicola

Pseudamnicola is a genus of small brackish water snails with an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

PyrgophorusW
Pyrgophorus

Pyrgophorus is a genus of very small freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Hydrobiidae.

Pyrgophorus coronatusW
Pyrgophorus coronatus

Pyrgophorus coronatus is a species of very small aquatic snail, an operculate gastropod mollusk or micromollusk in the family Hydrobiidae.

Pyrgophorus spinosusW
Pyrgophorus spinosus

Pyrgophorus spinosus, common name the spiny crownsnail, is a species of very small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

PyrgulaW
Pyrgula

Pyrgula is a genus of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

Pyrgula annulataW
Pyrgula annulata

Pyrgula annulata is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

PyrgulopsisW
Pyrgulopsis

Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.

Pyrgulopsis minkleyiW
Pyrgulopsis minkleyi

Nymphophilus minckleyi is a species of very small freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae.

RifiaW
Rifia

Rifia is a species of very small freshwater snail with an operculum, an aquatic operculate gastropod mollusks in the family Hydrobiidae.

SadlerianaW
Sadleriana

Sadleriana is a genus of small freshwater snails, aquatic gastropod mollusks in the family Hydrobiidae.

Sadleriana fluminensisW
Sadleriana fluminensis

Sadleriana fluminensis is a land snail from the family Hydrobiidae.

TanousiaW
Tanousia

Tanousia is an extinct genus of freshwater snails with gills and an operculum, a gastropod mollusk in the family Lithoglyphidae.

File:Littoridina gaudichaudii 2.pngW
File:Littoridina gaudichaudii 2.png