Originally the CPD were put in their own genus Celestichthys due to coloration differences between the two (was actually originally listed as Microrasbora, but it was done away with as it was simply a nameholder awaiting further study and reclassification) and later reclassified with the Emerald dwarf Rasbora into the Danio genus. The Danios, Devarios, Rasbora, and most of the Barbs have all needed some distinct study for some time and will likely go through quite a few more shifts as relationship and evolutionary attachments become more well known. The Danio and Devarios site has some good info as well as Seriously Fish for a far better breakdown of the genus and clades that are currently accepted
