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What is called "A. agassizii" is in fact a group of very similar but genetically different species. Given the large distribution of A. agassizii, new research by Estivals et al. suggests that this group might easily consist of hundreds of different species! As a rule of thumb we can assume that...
Your fish are not A. sp. Tefe which are distinguished from other agassizii-subcomplex species by the zigzag stripes males show along their body. For reference see here.
It's an eunotus- or cruzi-subcomplex species. Please tell us the catch location and show some photos of the male showing lateral band and caudal spot clearly. A photo of the complete female may also help.
Your fish could be some resticulosa-complex species but since they were sold as agassizii, they are most likely A. sp. Steel-blue. For some inexplicable reason these are often wrongly sold as agassizii or borellii.
Koslowski was one of the most knowledgable authors on Apistos and if you can get your hands on his newer book "Die Buntbarsche Amerikas 2 - Apistogramma & Co", buy it! His older book I would see more as a collectable for enthusisats today.