I copied the paragraph below from the Cichlid Room Companion
Comments: In 1983, Sven Kullander (Kullander, 1983) from the Swedish Museum of Natural History restricts the then powerful genus Cichlasoma to a group of species related to the type species of the genus, Cichlasoma bimaculatum, with this, species that were considered at the time in that now restricted genus and were excluded by Kullander in its classification were in the need of reclassification. For this, older genera then synonym of Cichlasoma were resurrected (sometimes without limits established or publications supporting it), other species described originally in Cichlasoma or in other genera now also restricted (e.g. Heros) were (an many still are) in the need of new genus created for them. Those species without a proper generic classification are here included in this temporary exCichlasoma section of the Cichlid Room Companion Catalogue (not a proper genus). I must state that Kullander suggested the temporary naming as 'Cichlasoma' (In single quotes) but due to software limitations of the scripts that run the Cichlid Room Companion (I am not changing code because of a single temporary naming) this is not possible and hence I adopt exCichlasoma for them. The species here listed will be eventually moved to their new classifications as they become available.