''Theodoxus pallasi'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of a freshwater snail with an operculum, an aquatic gastropod

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the family Neritidae, the nerites.

Description

Coloration, radula and operculum of ''Theodoxus pallasi'' is similar to ''

Theodoxus schultzii ''Theodoxus'' is a genus of nerites, small water snails with an Operculum (gastropod), operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bo ...

''.

Distribution

The distribution of is Ponto-Caspian.Zettler M. L. (2007). "A redescription of ''Theodoxus schultzii'' (Grimm, 1877), an endemic neritid gastropod of the Caspian Sea". '' Journal of Conchology'' 39(3): 245-251. This species occurs in: *

Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia ...

* Armenia * Kazakhstan * South Russia *

Uzbekistan Uzbekistan (, ; uz, Ozbekiston, italic=yes / , ; russian: Узбекистан), officially the Republic of Uzbekistan ( uz, Ozbekiston Respublikasi, italic=yes / ; russian: Республика Узбекистан), is a doubly landlocked co ...

* It was recorded from Kerman Province and Mazandaran Province in

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

(as ''Theodoxus lituratus'').Glöer P. & Pešić V. (2012). "The freshwater snails (Gastropoda) of Iran, with descriptions of two new genera and eight new species". ''

ZooKeys ''ZooKeys'' is a peer-reviewed open access scientific journal covering zoological taxonomy, phylogeny, and biogeography. It was established in 2008 and the editor-in-chief is Terry Erwin (Smithsonian Institution). It is published by Pensoft P ...

'' 219: 11-61, .

Predators

Predators of ''Theodoxus pallasi'' include: *

dunlin The dunlin (''Calidris alpina'') is a small wader, formerly sometimes separated with the other "stints" in the genus ''Erolia''. The English name is a dialect form of "dunling", first recorded in 1531–1532. It derives from ''dun'', "dull brown ...

''Calidris alpina'' Ehlert W. (1964). "Zur Ökologie und Biologie der Ernährung einiger Limikolen-Arten". ''

Journal für Ornithologie The ''Journal of Ornithology'' (formerly ''Journal für Ornithologie'') is a scientific journal published by Springer Science+Business Media on behalf of the Deutsche Ornithologen-Gesellschaft. It was founded by Jean Cabanis in 1853, becoming the o ...

'' 105(1): 1-53. .

References

Neritidae Taxa named by Wassili Adolfovitch Lindholm Gastropods described in 1924 {{Neritidae-stub