The only collection location listed on Cichlid Room Companion (San Francisco, Guatemala) lists them as the only cichlid species collected. I know Rusty Wessel and Eric Hanneman collected them and brought them back to the hobby. Maybe try shooting one of them an email to see if they recall what else was collected in the area.
Another site shows the holotype from Rio Motagua, which CRC lists contains the following species:
Cichlid species found (probably incomplete list) (17):
•Archocentrus spinosissimus Vaillant & Pellegrin, 1902
•Astatheros robertsoni (Regan, 1905)
•Astatotilapia stappersi (Poll, 1943)
•Chuco godmanni (Günther, 1862)
•Chuco intermedium Günther, 1862
•Chuco microphthalmus (Günther, 1862)
•Cryptoheros spilurus Günther, 1862
•exCichlasoma bocourti (Vaillant & Pellegrin, 1902)
•exCichlasoma salvini (Günther, 1862)
•exCichlasoma urophthalmus (Günther, 1862)
•Parachromis friedrichsthalii (Heckel, 1840)
•Paratheraps melanurus (Günther, 1862)
•Petenia splendida (Günther, 1862)
•Rocio octofasciata Regan, 1903
•Thorichthys aureus (Günther, 1862)
•Thorichthys meeki (Brind, 1918)
•Vieja maculicauda Regan, 1905