No, there is never a stupid question when trying to find out more about a species of cichlid. 
I think you maybe refering to the 'Synomyns' and 'Taxonomic' section where it states the confirmation of type locality of 'Cichlasoma' synspilus by (McMahan, 2011) Other than that i'm not sure where you mean.
Simply in a nutshell, synspilus is a junior synomyn of melanurus. The oldest described fish in this case is melanurus, so as always will prevail over the name synspilus.
Another example. If zonatus and guttulatus were found to be the same species, then guttulatus would become the described name as it is the oldest described fish.
I think you maybe refering to the 'Synomyns' and 'Taxonomic' section where it states the confirmation of type locality of 'Cichlasoma' synspilus by (McMahan, 2011) Other than that i'm not sure where you mean.
Simply in a nutshell, synspilus is a junior synomyn of melanurus. The oldest described fish in this case is melanurus, so as always will prevail over the name synspilus.
Another example. If zonatus and guttulatus were found to be the same species, then guttulatus would become the described name as it is the oldest described fish.