So unsurprisingly, there’s very little information available about the species.
This beautiful cichlid comes from the Paraguay river system and it can also probably be found in southern Brazil and northern Argentina.
For the “species spec”, I have had the best of luck reading the original description from 1906 and the revision from 1982. The types used for the species had a standard length of approximately 16-38 mm. Based on this and the size of the fish that I received, I would estimate standard adult sizes to be around 30 mm for a female and 40-45 mm for a male. The fish should be kept at 17-27°C (63-81°F), and ideally at 20-22°C.
As with most other Apistogramma, these are omnivores that benefit from small, live foods. My pair are currently on small bloodworm, daphnia, Aquadip cichlid flakes and Aquadip cichlid granules.
Both photos are of the same older juvenile/young adult female fish in stressed colours as they are not used to people yet.
 Regan, C.T. 1906, “Revision of the South-American cichlid genera Retroculus, Geophagus, Heterogramma, and Biotoecus.”. Annals and Magazine of Natural History (Series 7) v. 17 (no. 97)::49-66
 Kullander, S.O. 1982, “Cichlid fishes from the La Plata basin. Part II. Apistogramma commbrae (Regan 1906)”. Revue Suisse de Zoologie v. 89 (no. 1): 33-48
 based on collection data, what Robert Wiltshire of dwarfcichlid.com says and my own experience