Fits right in with problems identifying killifish that look alike as Wright mentioned, fish that look like the same species but might not be (like Aggies from different locales that might not mate). How do you define species versus sub-species. To people hwo do not raise fish, an otocinclus may look like a Siamese Algae eater. One fish store owner that has been around for a long time regales me with stories of all the different types of "weird" fish that used to come in when the hobby was a lot less sophisticated and the hobbyists didn't know the difference. There were at least three types of fish coming in as red devils. The failure of the hobbyists to note the differences caused the three different species to be cross-bred so domestic strains are suspect as to what their actual blood lines were (read in some Tropical Fish Magazine many years ago). There are numerous examples of fish that were new science being initially imported as an already known species. I believe that this has been happening with apistos for a long time. ______________________________________________________