''Rasboroides pallidus'' is a species of freshwater

cyprinid Cyprinidae is a family of freshwater fish commonly called the carp or minnow family. It includes the carps, the true minnows, and relatives like the barbs and barbels. Cyprinidae is the largest and most diverse fish family and the largest verte ...

fish

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to southwestern

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

. It is only known from shallow, slow-flowing streams in the basins of the

Kalu River Kalu Ganga ( si, කළු ගඟ; literally: Black River) is a river in Sri Lanka. Measuring in length, the river originates from Sri Padhaya and reach the sea at Kalutara. The Black River flows through the Ratnapura and the Kalutara District a ...

, Bentara River,

Gin River The Gin Ganga ( si, ගිං ගඟ, ''Gin River''), is a long river situated in Galle District of Sri Lanka. The river's headwaters are located in the Gongala Mountain range, near Deniyaya, bordering the Sinharaja Forest Reserve. The riv ...

, Polathu-Modera River and

Nilwala River __NOTOC__ Nilwala is a river in Southern Province in Sri Lanka. It originates from Sinharaja Forest Reserve Sinharaja Forest Reserve is a forest reserve and a biodiversity hotspot in Sri Lanka. It is of international significance and has been ...

. It has been introduced to the

Mahaweli The Mahaweli River ( si, මහවැලි ගඟ, literally "Great Sandy River"; ta, மகாவலி ஆறு 'mahawali gangai'', is a long river, ranking as the longest river in Sri Lanka. It has a drainage basin of , the largest in the ...

and Walawe River basins, and is overall less

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...

than the related '' R. vaterifloris''. A comprehensive

taxonomic Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...

review in 2018 based on

morphometry Morphometrics (from Greek μορϕή ''morphe'', "shape, form", and -μετρία ''metria'', "measurement") or morphometry refers to the quantitative analysis of ''form'', a concept that encompasses size and shape. Morphometric analyses are co ...

meristics Meristics is an area of ichthyology and herpetology which relates to counting quantitative features of fish and reptiles, such as the number of fins or scales. A meristic (countable trait) can be used to describe a particular species of fish, or us ...

and

mtDNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA ...

disputed the validity of '' R. rohani'', showing that it is a

junior synonym The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linna ...

of ''R. pallidus''; this synonymy is followed by the Catalog of Fishes but not the FishBase. It can grow to

standard length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish m ...

References

Rasboroides Freshwater fish of Sri Lanka Endemic fauna of Sri Lanka Taxa named by Paulus Edward Pieris Deraniyagala Fish described in 1930 {{Cyprinidae-stub