When printed in 1996 the AQUALOG reference book South American Cichlids 2 (ISBN 3931702073), contained all known species of the genus Apistogramma. In the meantime many new species have been discovered. Now we have made a start on updating with this AQUALOG Extra, which contains photos mainly of species and variants which to date have not figured in the main AQUALOG book, South American Cichlids 2. In the case of new fishes that are very similar to species already known for some time, then the later are also pictured for comparison. Likewise, where a new import has been given only a number to distinguish it in the trade (for example, Apistogramma sp. Paraguay I and Apist. Spec. Paraguay II, etc.), all relevant species/variants are illustrated for purpose of comparison, in order to make accurate identification possible. And finally, some long-known fishes are included again because they have now been scientifically determined, for example, Apistogramma sp. Sunset, which is now correctly known as Apist. Atahualpa. All in all, on over 220 fantastic color photos is shown why Apistogramma became such popular dwarf cichlids.