|adult Opisthorchis viverrini|
Species in the genus Opisthorchis include:
- Opisthorchis felineus (Rivolta, 1884)
- Opisthorchis gomtii Mehra, 1941
- Opisthorchis parasiluri Long & Lee
- Opisthorchis sinensis
- Opisthorchis viverrini Poirier, 1886
From the Greek opisthen (behind) and orchis (testicle), Opisthorchis is a genus of trematode flatworms whose testes are located in the posterior end of the body. Rivolta is generally credited with discovering the first opisthorchid, which he named Distoma felineus, in a cat in Italy in 1884. However, the fluke may have been mentioned by Rudolphi in 1819, and in 1831, Gurlt published a textbook that included a drawing of a fluke that was almost certainly Opisthorchis. By the end of the 19th century, Distoma contained so many species that Blanchard introduced the genus Opisthorchis for elongated flat flukes with testes in the posterior end of the body. He chose Rivolta’s Opisthorchis felineus as the type species. 
Includes public domain text from the CDC as cited
- Opisthorchiasis at the US National Library of Medicine Medical Subject Headings (MeSH)
- Blanchard, R. (1895). Séance du 26 Novembre 1895. Bulletin de la Société zoologique de France 20: 217. Text on biodiversitylibrary.org.
- Gibson, D. (2009). Opisthorchis gomtii Mehra, 1941. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=109076 on 2010-06-24
- Long, S., Lee, W. C. (1958). Parasitic worms from Tai Hu fishes: digenetic trematodes. II. Opisthorchidae and other families, with a description of a new species of Opisthorchis. Acta Zoologica Sinica, 4.
- "SelfEtymologia: Opisthorchis". Emerg Infect Dis [Internet]. (CDC) 20 (1): 83–88. January 2014. doi:10.3201/eid2001.ET2001. Retrieved 23 December 2013.
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