Cairnsichthys is a genus of rainbowfishes from the subfamily Melanotaeniinae. The genus is endemic to freshwater streams in eastern Queensland in north eastern Australia. The genus was designated as a monotypic genus in 1928 by John T. Nichols and Henry C. Raven but in 2018 a second species was assigned to the genus.
Species Cairnsichthys bitaeniatus Allen, Hammer & Raadik, 2018 - Daintree rainbowfish Cairnsichthys rhombosomoides (Nichols & Raven, 1928) - Cairns rainbowfish
Etymology The genus is named after the Australian city of Cairns with the suffix ichthys which is Greek for "fish".
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