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Try the DATZ book or Koslowski's 2002 book. In truth, there are many different populations, forms, and color morphs. A. agassizii, as we generally know it probably is a 'superspecies', a group of populations that have recently diverged from the ancestral species, but still very similar morphologically and whose females will interbreed if given no option. Look at the old apisto species list on Tom Christoffersen's web site. It breaks down the various agassizii populations into different "cf. agassizii" species - at least how I see them. Other opinions may (will!) vary.