Hello Peter,
First of all the nimbaensis isn't an Aphyosemion. It should be either a Plataplochilus or some other genus. Most probably another lampeye killie.
For pictures of the Epiplatys and alot of West African killies, try this website - Killifish of Western Africa
As for the Rivulus, do a Google for Rivulus punctatus. You'll find enough pictures to give you a rough idea as to how the cf. punctatus should look like.
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