Ouranopithecus
[2] The first specimen O. macedoniensis was discovered by French palaeontologists Louis de Bonis and Jean Melentis in 1977,[3] and O. turkae by Turkish team led by Erksin Savaş Güleç in 2007.[2] For a long time it was considered as similar (synonymous) to Graecopithecus and member of the genus Sivapithecus,[4] which more discoveries proved otherwise.It is true that O. macedoniensis shares derived features with some early hominins (such as the frontal sinus, a cavity in the forehead), but they are almost certainly not closely related species.[9] In 1984, British palaeontologists Peter Andrews and Lawrence B. Martin classified Graecopithecus and Ouranopithecus as synonyms (same taxon) and treated them as members of the genus Sivapithecus.[15][16] However, better O. macedoniensis specimens were found[17] including a new species Ouranopithecus turkae from Turkey[18] that warranted separation of the genus.