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[[Image:Trichuris ovis.jpg|thumb|right|150px|''Trichuris ovis'' in caecum - Supplied by Biomed Image Archive]]
[[Image:Trichuris ovis.jpg|thumb|right|150px|''Trichuris ovis'' in caecum - Supplied by Biomed Image Archive]]
[[Image:Trichuris vulpis.jpg|thumb|right|150px|''Trichuris vulpis'' - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
[[Image:Trichuris vulpis.jpg|thumb|right|150px|''Trichuris vulpis'' - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
[[Image:Capilaria.jpg|thumb|right|150px|''Capilaria'' - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
[[Image:Trichinella spiralis H and E.jpg|thumb|right|150px|''Trichinella spiralis'' stained with H and E - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
[[Image:Trichinella spiralis.jpg|thumb|right|150px|''Trichinella spiralis'' - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
The common feature of members of this group is that the oesophagus is a column of doughnut-shaped cells. They are only distantly related to the other nematode groups and so drugs developed primarily for controlling strongyle and ascarid worms are often less effective against these.
The common feature of members of this group is that the oesophagus is a column of doughnut-shaped cells. They are only distantly related to the other nematode groups and so drugs developed primarily for controlling strongyle and ascarid worms are often less effective against these.