hahaha i was thinking the same thing... i have been on wikipedia several times looking at tetra and recognized the list... anyway, when on wiki, even though the upfront list of tetra doesnt have columbianus, if you specifically go to the hyphessobrycon genus area, it has it in that list (and actually has a page for it, more than 75% of the species of tetra it names dont even have a page)...
i know, cause my newest little homies are hyphessobrycon rosaceus... i love those little guys, so energetic...