Opisthorchiasis caused by Opistorchis viverrini(O.viverrini) remains as medically important problem in Thailand especially in the north-eastern part.Infection with this parasite can lead to cholangiocarcinoma improvement.The highest prevalence of O.viverrini infection has been found in the Northeast Thailand and is associated with the high incidence rate of cholangiocarcinoma.To complete the life cycle of 0.viverrini,the freshwater snails namely Bithynia funiculata,Bithynia siamensu siamensis and Bithynia siamensis goniomphalos(B.s.goniomphalos) are required to serve as the first intermediate host.Within these snails group,B.s.goniomphalos is distributed concisely in northeast Thailand and acts as the majority snail that transmitted the opisthorchiasis in this region.This study described the information of B.s.goniomphalos which research are needed for understanding the biology,distribution,transmission and factors influencing on the infection of the snail vector of this carcinogenic parasite. Opisthorchiasis caused by Opistorchis viverrini (O.viverrini) remains as medically important problem in Thailand especially in the north-eastern part .fection with this parasite can lead to cholangiocarcinoma improvement. The highest prevalence of O.viverrini infection has been found in the Northeast Thailand and is associated with the high incidence rate of cholangiocarcinoma.To complete the life cycle of 0.viverrini, the freshwater snails namely Bithynia funiculata, Bithynia siamensu siamensis and Bithynia siamensis goniomphalos (Bsgoniomphalos) are required to serve as the first intermediate host. Whithin these snails group, Bsgoniomphalos is distributed concisely in northeast Thailand and acts as the majority snail that transmitted the opisthorchiasis in this region. This study described the information of Bsgoniomphalos which research are needed for understanding the biology, distribution, transmission and factors influencing on the infection of the snail vector of this carcinogenic p arasite.