The aim of the present study is to report the occurrence of Styphlotrema solitaria Looss, 1899 infecting sea turtles of the species Eretmochelys imbricata Linnaeus, 1758 found in the North Coast of São Paulo State, Brazil. Only nine S. solitaria specimens were found in the hosts studied, with a mean intensity of infection of 4.5. Since 2002, 14 specimens of E. imbricata from this region were necropsied and the prevalence of S. solitaria was 14.2%. New variations on morphological data were presented for this digenetic species. This is the first occurrence of S. solitaria in sea turtles from Brazilian Coast, expanding the information on the helminth fauna of E. imbricata and the geographical distribution of S. solitaria.
KEY WORDS: Brazil, Eretmochelys imbricata, sea turtles, Styphlotrema solitaria, Trematoda.