| Mayaheros alborum (Hubbs, 1936) |
| Mayaheros amarus (Hubbs, 1936) |
| Mayaheros beani (Jordan, 1889) |
| Mayaheros cienagae (Hubbs, 1936) |
| Mayaheros ericymba (Hubbs, 1938) |
| Mayaheros mayorum (Hubbs, 1936) |
| Mayaheros urophthalmus (Günther, 1862) |
| Mayaheros zebra (Hubbs, 1936) |
| Maylandia Meyer & Förster, 1984 |
| Maylandia estherae (Konings, 1995) |
| Maylandia lombardoi (Burgess, 1977) |
| Maylandia zebra (Boulenger, 1899) |
| Melanochromis Trewavas, 1935 |
| Melanochromis auratus (Boulenger, 1897) |
| Mesoheros McMahan & Chakrabarty, 2015 |
| Mesoheros festae (Boulenger, 1899) |
| Mikrogeophagus Meulengracht-Madsen, 1968 |
| Mikrogeophagus altispinosus (Haseman, 1911) |
| Mikrogeophagus ramirezi (Myers & Harry, 1948) |
| Nandopsis Gill, 1862 |