''Clithon retropictum''( ko, 기수갈고둥, ja, 石蜑螺) 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 freshwater and
brackish water snail
A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gastro ...
with an
operculum, a
nerite
Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum.
MolluscaBase eds. (2021). MolluscaBase. Neritininae Poey, 1852. Accessed through: ...
. It is an
aquatic gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
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
Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum.
MolluscaBase eds. (2021). MolluscaBase. Neritininae Poey, 1852. Accessed through: ...
, the nerites.
Distribution
This species occurs in
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
:
Honshu
, historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separ ...
,
Kyushu
is the third-largest island of Japan's five main islands and the most southerly of the four largest islands ( i.e. excluding Okinawa). In the past, it has been known as , and . The historical regional name referred to Kyushu and its surroun ...
and
Shikoku.Its habitat is also located in South Korea near Jeju.
Description
Habitat
This nerite lives in brackish water as well as freshwater.
Feeding habits
''Clithon retropictum'' is
herbivorous species.
Life cycle
''Clithon retropictum'' is
oviparous
Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, most reptiles, and all pterosaurs, dinosaurs (including birds), and ...
.
[FURUJO Yuki & TOMIYAMA Kiyonori]
''Distribution and Microhabitat of Coexisting Two Freshwater Snail Species, Semisulcospira libertina (Gould) (Prosobranchia; Pleuroceridae) and Clithon retropictus (Martens) (Prosobranchia: Neritidae)''
The Japanese journal of malacology. Venus, Vol. 59, No. 3(20000930), pp. 245-260. Juveniles hatch from eggs in September.
The lifespan of ''Clithon retropictum'' is up to 12 years and it belongs among the most long-lived of freshwater gastropods.
Parasites
* ''
Vibrio parahaemolyticus''
Status
The species is considered as a second grade endangered species by the Korean ministry of environment.
The occurrence of Clithon retropictus (v. Martens, 1879) (Gastropoda: Neritidae) in an unusual habitat, northern Jeju Island, Republic of Korea Ronald G. Noseworthy, Hee-Jung Lee & Kwang-Sik Choi Ocean Science Journal volume 48, pages259–262
/ref>
References
Further reading
* HIRATA TETSU, UEDA HAJIME, TSUCHIYA YASUTAKA, SATO TOSHIHIKO & NISHIWAKI SABURO. 1999
''Distribution of Clithon retropictus(Gastropoda; Neritidae) and environmental conditions in the rivers of Izu Peninsula''
Bulletin of the Faculty of Education & Human Sciences, Yamanashi University, Volume 1, number 1, 24-30. (article in Japanese, English abstract)
External links
* https://web.archive.org/web/20070909103814/http://shell.kwansei.ac.jp/~shell/pic_book/data08/r000792.html photos of shells
* https://web.archive.org/web/20080907101015/http://www.gastropods.com/8/Shell_8638.html photos of shells
Neritidae
Gastropods described in 1879
Endangered species
{{Neritidae-stub