Cyrtosomum
Cyrtosomum is a genus of nematodes belonging to the family Atractidae. The species of this genus are found in America. Species:

Cyrtosomum heynemani 
Cyrtosomum kachugae 
Cyrtosomum lissemysi 
Cyrtosomum longicaudatum 
Cyrtosomum penneri 
Cyrtosomum readi 
Cyrtosomum scelopori

References

Nematodes