Sinocyclocheilus donglanensis

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Sinocyclocheilus donglanensis
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Subfamily: Barbinae
Genus: Sinocyclocheilus
Species:
S. donglanensis
Binomial name
Sinocyclocheilus donglanensis

Sinocyclocheilus donglanensis (Donglan golden-line barbel [3] ) is a species of cave fish in the family Cyprinidae. [1] [2] [3] [4] It is endemic to Guangxi province in southern China, and only known from a subterranean tributary of the Hongshui River, a tributary of the Pearl River. [2] Its specific name donglanensis refers to the Donglan County where its type locality is located. [1] It is not known from elsewhere. [3]

Contents

Description

Sinocyclocheilus donglanensis grows to 12.4 cm (4.9 in) standard length; mean length of five individuals was 8.3 cm (3.3 in). The head is compressed and has developed eyes. The mouth has two barbels and is slightly inferior, with the upper jaw that protrudes slightly beyond the lower one. The body is compressed and completely scaled. The highest body depth (about 31% of standard length) occurs exactly at the dorsal fin insertion. The lateral line is complete and curved. In preservative, the colour of the back is dark brownish; the abdomen is light grayish. Pelvic and anal fins are light yellowish. [1]

It resembles morphologically most closely Sinocyclocheilus yishanensis known from the Liu River, another river in the Pearl River system. Both have "normal" body shape, in contrast to some other Sinocyclocheilus species showing humps or horns. [1]

Ecology and behaviour

Virtually nothing is known about the ecology and behaviour of this species. It shares its habitat (and type locality) with another cave fish species, Sinocyclocheilus altishoulderus . [1] [3]

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Sinocyclocheilus donglanensis is only known from the Donglan County in Guangxi, China

Habitat and conservation

The type locality, near Gongping Village, Taiping Town, Donglan County, is a subterranean river some 10–20 metres inside from the mouth of a small cave. During the rainy season, the water can extend outside the cave to form a small lake. [1] The habitat is potentially threatened by water extraction, waste disposal and pesticide pollution, and landscape alterations in general. [3]

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Sinocyclocheilus is a genus of freshwater fish in the family Cyprinidae endemic to China, where only found in Guangxi, Guizhou and Yunnan. Almost all of its species live in or around caves and most of these have adaptions typical of cavefish such as a lack of scales, lack of pigmentation and reduced eyes. Several species have an unusual hunchbacked appearance and some of the cave-dwellers have a "horn" on the back, the function of which is unclear. In contrast, the Sinocyclocheilus species that live aboveground, as well as a few found underground, show no clear cavefish adaptions. They are relatively small fish reaching up to 23 cm (9.1 in) in length. The individual species have small ranges and populations, leading to the status of most of the evaluated species as threatened. Many species populations in the genus have yet to be evaluated by the IUCN.

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Donglan County County in Guangxi, Peoples Republic of China

Donglan County is a county of northwest Guangxi, China. It is under the administration of Hechi City.

Sinocyclocheilus altishoulderus is a species of cave fish in the family Cyprinidae. It is endemic to Guangxi province in southern China, and only known from a cave in Donglan County, from a subterranean tributary of the Hongshui River, a tributary of the Pearl River.

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Sinocyclocheilus yimenensis is a species of cave fish in the family Cyprinidae. It is endemic to Yunnan province in southern China. Its specific name yimenensis refers to the Yimen County where its type locality is.

Sinocyclocheilus yishanensis is a species of cave fish in the family Cyprinidae. It is endemic to Guangxi province in southern China and known from the Liu River, a tributary of the Pearl River. Its specific name yishanensis refers to the Yishan County where its type locality is.

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References

  1. 1 2 3 4 5 6 7 Zhao, Yahui; Watanabe, Katsutoshi; Zhang, Chunguang (2006). "Sinocyclocheilus donglanensis, a new cavefish (Teleostei: Cypriniformes) from Guangxi, China". Ichthyological Research. 53 (2): 121–128. doi:10.1007/s10228-005-0317-z. S2CID   36978051.
  2. 1 2 3 Froese, Rainer and Pauly, Daniel, eds. (2015). "Sinocyclocheilus donglanensis" in FishBase. October 2015 version.
  3. 1 2 3 4 5 Noakes, David; Romero Aldemaro; Yahui Zhao; Yingqi Zhou (18 November 2009). Chinese Fishes. Springer Science & Business Media. p. 225. ISBN   978-90-481-3458-8.
  4. Eschmeyer, W. N. and R. Fricke (eds) (2 November 2015). "Catalog of Fishes". California Academy of Sciences. Retrieved 25 November 2015.CS1 maint: extra text: authors list (link)