Ascarididae Baird 1853
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- Ascaris Linnaeus 1758
- Baylisascaris Sprent 1968
- Hexametra Travassos 1919
- Paradujardinia Travassos 1933
- Parascaris Yorke & Maplestone 1926
- Porrocaecum Railliet & Henry 1915
- Toxascaris Leiper 1907
- Toxocara Stiles & Hassal 1905