| Yunnanilus discoloris | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Cypriniformes |
| Family: | Nemacheilidae |
| Genus: | Yunnanilus |
| Species: | Y. discoloris |
| Binomial name | |
| Yunnanilus discoloris | |
Yunnanilus discoloris is a species of ray-finned fish, a stone loach, in the genus Yunnanilus . It is currently only in a single spring in the drainage basin of Lake Dianchi in Yunnan.
Yunnanilus discoloris is so named because of the sexual dimorphism this species shows. The specific name discoloris means differently coloured, it refers to the sexually dimorphic colour pattern. The males have a black longitudinal stripe on both flanks with a light blackish stripe of spots along its back while the female shows black spotting and blotching on both the back and the flanks. [3] It is a dwarf species which has a scaleless body and the origin of the dorsal fin is in halfway along the body. [4]
It is restricted to one tributary spring, the White Dragon Spring near Chenggong in Kunming, which flows into Lake Dianchi in Yunnan, southern China. The water in the spring, which lies at 1,886m above sea level, is clear with a bed consisting of sand with some stones and with a plant community made up of Ceratophyllum demersum , Spirogyra spp. and other species of macrophytes growing on the substrate. [1]
Yunnanilus discoloris has a very restricted range, the single spring in which it occurs contains introduced species and the spring has been modified by man. The spring is not protected and the IUCN assess the status of this species as Critically Endangered. [1] There may be 500 individuals in the White Dragon Spring. It formerly occurred in Lake Dianchi but its extirpation from there is thought to have been the result of the introduction of black carp, grass carp, silver carp and bighead carp into the lake, as well as pollution and the resultant loss of macrophytes. [4]
Anabarilius polylepis is a species of ray-finned fish in the family Cyprinidae, that is endemic to Yunnan, China. It only occurs in Dian Lake and Songhuaba reservoir in Kunming. It was once a major commercial fish species, but it has not been confirmed in the lake since the 1970s. Its decline is attributed to many factors: introduced fish species, decreasing water quality, the loss of macrophytes, over-fishing, and the loss of breeding sites due to siltation and blocked access.
Cyprinus micristius, the Dianchi carp, is a critically endangered species of ray-finned fish in the family Cyprinidae. It is found only in Lake Dianchi and its tributaries in Yunnan, China. The nominate subspecies from the lake itself has not been confirmed since the 1960s.
Yunnanilus macrogaster is a hypogean species of stone loach endemic to China. This species is endemic to the endorheic drainage system which feeds the Datangzi Marsh in Luoping County, Yunnan, the marsh has been formed by the outflow of a stream from its underground course. It is a demersal species and the waters where it was found were densely vegetated, it feeds on worms and insects. It is sympatric with Yunnanilus niger and Y, paludosus, forming a small species flock. It lays eggs which it does not guard.
Yunnanilus is a genus of small stone loaches that are endemic to southeastern China, especially Guangxi and Yunnan. They are found in rivers, streams and lakes; some species are restricted to caves.
Yunnanilus niger is a hypogean species of stone loach endemic to China. This species is endemic to the endorheic drainage system which feeds the Datangzi Marsh in Luoping County, Yunnan,
Yunnanilus nigromaculatus is a species of stone loach endemic to the Dianchi Lake basin in China, but has apparently been extirpated from Dianchi Lake itself due to heavy pollution. It was formerly placed in the genus Eonemachilus.
The Dianchi bullhead, Pseudobagrus medianalis, is a species of catfish in the family Bagridae. It is endemic to the Lake Dianchi basin in Yunnan, China. It can grow to 20 cm (7.9 in) TL. It is a cryptic, benthic fish that hides during the daytime and forages on small fishes and aquatic invertebrates at night.
Yunnanilus altus is a species of ray-finned fish, a stone loach, in the genus Yunnanilus from Yunnan. It occurs in small streams with a moderate current where it moves slowly in shoals along the substrate. Its diet consists of filamentous algae and insects. The type locality is in Zhanyi County.
Yunnanilus analis is a species of ray-finned fish, a stone loach, in the genus Yunnanilus. The type locality is Xingyun Lake in Yunnan, southern China. The specific name analis means "of the anus" and refers to the six branched rays in the anal fin, a unique feature among the species classified under Yunnanilus.
Yunnanilus brevis, common name Inle loach, is a species of ray-finned fish in the genus Yunnanilus, although some authorities place it in the genus Petruichthys. It is only found in Inle Lake and the adjacent He-Ho Plain in the Southern Shan States in Myanmar. It is a demersal fish which occurs in still and slow running waters as well as in a shallow lake, with dense submerged and floating vegetation.
Yunnanilus longibulla is a species of ray-finned fish, a stone loach, in the genus Yunnanilus. The type locality for this species is Chenghai Lake in Yunnan. The specific name longibulla means "long bubble" and refers to the elongated shape of the swim bladder compared to closely related species.
Yunnanilus nanpanjiangensis is a species of ray-finned fish, a stone loach, in the genus Yunnanilus. It is endemic to China and uts type locality is near Agang Town, Luoping County, Yunnan and the specific name refers to the Nanpanjiang River.
Yunnanilus obtusirostris is a species of ray-finned fish, a stone loach in the genus Yunnanilus. Its type locality is the West Dragon Spring, which flows into Fuxian Lake in Chengjiang County, Yunnan. It mau be a species in the genus Heminoemacheilus rather than Yunnanilus. The specific name is a compound of the Latin rostrum meaning a "beak" and obtusus meaning "blunt", this refers to the species' short snout.
Yunnanilus sichuanensis is a species of ray-finned fish, a stone loach, in the genus Yunnanilus. It is endemic to Sichuan in China where the type locality is the Shuyalong Jiang River in the drainage of the Anning River in Mianning County.
Xenocypris yunnanensis, the Kunming nase, is a species of ray-finned fish in the genus Xenocypris. It is endemic to Lake Dianchi in Yunnan Province, China. The species started to decline in the 1970s and has not been caught in the lake after two specimens were collected in 1985; it may be extinct. Its demise is likely due to introduced fish species, grass carp. It was also impacted by over-fishing and pollution. They grow to a maximum length of 23 cm (9.1 in). They are dark grayish with a silvery white belly, gray dorsal fin, reddish anal fin and orange red caudal fin. They have a rounded belly, blunt snout, eyes on the lateral of their heads, small and transverse mouth.
Yunnanilus ganheensis is a species of freshwater ray-finned fish, a stone loach in the genus Yunnanilus. The type locality is Ganhe in Xundan County in Yunnan and the specific name refers to that location.
Yunnanilus bailianensis is a troglobitic species of freshwater ray-finned fish, a stone loach from the genus Yunnanilus. Its type locality is disputed with some authorities stating it is the Heilongtan Reservoir in Shilin County, Yunnan the reservoir is in the drainage system of the Ba Jiang, from which the species' specific name may derive, although other authorities give the type location and the specific name derivation as Bailian Cave near Liuzhou in Guangxi Province.
Yunnanilus niulanensis is a species of freshwater ray-finned fish, a stone loach from the genus Yunnanilus. Its type locality is the Yanglinhe River in Songming County in Yunnan. The specific name refers to the Niulanjiang River, in the Yangtze basin, of which the Yanglinhe is a tributary.
Yunnanilus spanisbripes is a species of ray-finned fish, a stone loach, in the genus Yunnanilus. The type locality of this species is the Niulanjiang River in Zhanyi County in Yunnan.
Yunnanilus yangzonghaiensis is a species of freshwater ray-finned fish, a stone loach, in the genus Yunnanilus. It is endemic to China and its type locality is Yangzong Lake in Yunnan. This species has been placed in the genus Eonemachilus.
