Schistosoma ovuncatum is a schistozome

Schistosoma

A genus of trematodes, Schistosoma, commonly known as blood-flukes and bilharzia, includes flatworms which are responsible for a highly significant parasitic infection of humans by causing the disease schistosomiasis, and are considered by the World Health Organization as the second most...

 parasite, first described in 2002. Its recognition as a new species only occurred when zoologists were re examining specimens originally described in 1984

The species was described from material collected in Chiang Mai Province

Chiang Mai Province

Chiang Mai is the second-largest province of Thailand, located in the north of the country. Neighboring provinces are Chiang Rai, Lampang, Lamphun, Tak, and Mae Hong Son. In the north it borders Shan State of Burma...

, northwest Thailand

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

. The name is derived from the shape of the egg (ovum = egg + uncatus hooked). The natural final host is the rat (Rattus rattus) and the intermediate host is the pomatiopsid snail Tricula bollingi

Tricula bollingi

Tricula bollingi is a species of freshwater snail, a gastropod in the Pomatiopsidae family....

.