Title
A review of the danionine genera Rasboroides and Horadandia (Pisces: Cyprinidae), with description of a new species from Sri Lanka
Author(s)
Batuwita, S.;De Silva, M.;Edirisinghe, U.
Published
2013
Publisher
Ichthyological Exploration of Freshwaters
Abstract
The taxonomy of Rasboroides and Horadandia, two genera of small danionine cyprinids that occur in southern India and Sri Lanka, is reviewed. Rasboroides comprises four species, distinguished as follows: R. vaterifloris and R. nigromarginalus differ from their congeners by a lesser body depth (26.9-33.0 % SL); and from each other by a greater interorbital width in males (29-33 % HL vs. 17-22) and greater anal-fin depth in females (23.5-24.8 % SL vs. 17.4-22.7) of R. vaterifloris. Rasboroides pallidus differs from R. rohani, new species, by its smaller size (up to 24.6 mm vs. 35.5 mm SL), by possessing fewer scales in transverse line on body (1/2 61/2-1/271/2 vs. 1/281/2) and in lateral series (20-24 vs. 25-28). Rasboroides differs from Horadandia, its sister group, by the presence in males of a series of tubercles on the leading edge of the pectoral fin (absent in Horadandia) and by possessing 3 (vs. 2) rows of pharyngeal teeth, while the pharyngeal teeth of Horadandia are ornamented distally by a series of cusps, a character absent in Rasboroides. Horadandia brittani is recognized as a valid species, distinguished from H. atukorali by possessing a smaller eye (eye diameter 27-37 % HL, vs. 37-41) and having the dorsal-fin origin closer to the hypural notch (vs. midway between snout-tip and hypural notch). The genus Rasboroides is restricted to shaded rainforest streams in the south-western 'wet zone' (Kalu to Walawe Rivers) of Sri Lanka, whereas Horadandia occurs in the coastal floodplains of western Sri Lanka and southern India. © 2013 by Verlag Dr. Friedrich Pfeil.
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PUB13352