Rico Morgenstern wrote:diadema and sp. 'Jenaro Herrera' are in fact not the same. Kullander, in his 1986 book of peruvian cichlid fishes, has identified specimens of the latter as A. diadema, but later he came to the conclusion that they represent an undescribed species. Of the links given by you, DRE, the first one is to the real A. diadema, which is confined to upper Orinoco and Rio Negro drainages. Apart from the color differences, the two species differ in their breeding behavior: While Aequidens sp. 'Jenaro Herrera' is a substrate brooder like A. metae and most other Aequidens, A. diadema is a delayed, or larvophile, mouthbrooder.
As to your pics, Catherine, I would say the first one is a A. metae of the common aquarium strain also available here in Germany (probably originating from the Upper Rio Meta drainage). The second shows a beautiful A. sp. 'Jenaro Herrera'. The remainder looks like geographical variant of, or an undescribed species close to, A. metae from middle Orinoco area (i.e. Puerto Ayacucho).
All the best
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