Coastal Fishes of Sao Tome and Principe islands, Gulf of Guinea (Eastern Atlantic Ocean) - an update. Peter Wirtz Carlos Eduardo L. Ferreira Sergio R. Floeter Ronald Fricke Joao Luiz Gasparini Tomio Iwamoto Luiz Rocha Claudio L. S. Sampaio Ulrich K. Schliewen Zootaxa 2007 1523 1 48 7BTG9 Osorio, 1891 Osorio 1891 Osorio 1891 Actinopterygii Labridae Thalassoma Animalia Perciformes Chordata species newtoni  SMNS 23066 (1 specimen) Sao TomeCity; SMNS 23131 (3 specimens) Rolas Island; SMNS 24878 (20 specimens) Rolas Island. UFES 172 (12 specimens) Praia Quinze, near Lagoa Azul, Sao Tome. For a long time, T. newtoniwas treated as a junior synonym of T. pavo (Linnaeus, 1758). Afonso et al. (1999) also used the name T. pavobut noted that the color pattern of animals from Sao Tomeisland was distinctly different (Figure 14). In a genetic comparison of the Atlantic species of the genus Thalassoma, Costagliola et al. (2004)noted a large genetic divergence between specimens from Sao Tomeand Mediterranean specimens of T. pavo; furthermore, the species T. ascensionisand T. sanctaehelenaewere more closely related to animals from Sao Tomethan these were to T. pavo. Thus, T. newtoniappears to be a valid species but a morphological comparison with T. pavois still outstanding. Juveniles of this species were frequently observed cleaning other fish.