Amidostomum
Amidostomum is a genus of nematodes belonging to the family Amidostomatidae. The genus has cosmopolitan distribution. Species:

Amidostomum acutum 
Amidostomum anseris 
Amidostomum cygni 
Amidostomum fulicae 
Amidostomum henryi 
Amidostomum spatulatum

References

Nematodes