Identifying the many species of Corydoras is becoming more and more difficult; there are a considerable number of species that can easily be mistaken for others that are similarly marked. Here I will try and show some of the characteristics that may help to separate some of the species that come into the trade as Corydoras punctatus, bearing in mind that these are only my opinions and should be used as a guide and not to be taken as fact. As I go through groups of species it will lead into other confusions and bring in species that are possibly new and yet to be described by science. The most obvious solution would be to have a picture database of all known species, which could then be used for comparison; unfortunately we don't have that luxury although the Aqualog "All Corydoras" book comes close.
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