Most of the Rasboras are small in size which can up to 10 cm long. Rasbora is a genus of small minnow-type fish in family Cyprinidae which is the most extensive freshwater families being studied but the intrageneric relationship among its members have not being investigated well. According to Mayden et al. (2007), Rasbora was not a monophyletic assemblage but Boraras and Trigonostigma were determined to be monophyletic. Monophyletic taxon is group of organisms with formal taxonomic name that are descended from a single ancestor. The genus Rasbora is polyphyletic which relative to Boraras and Trigonostigma. Some Rasboras are genetically more closely related to members of the Rasboroides , Boraras , and Trigonostigma than to other species
