Eucoleus is a genus of nematodes belonging to the family Capillariidae. Dwelling "primarily in the airways of foxes, it can be found worldwide in dogs and cats", in which it causes a disease known as eucoleosis.

The genus has cosmopolitan distribution.

Species:

Eucoleus aerophilus Eucoleus annulatus Eucoleus bacillatus Eucoleus baskakowi Eucoleus boehemi Eucoleus boehmi Eucoleus contortus Eucoleus dispar Eucoleus dubius Eucoleus garfiai Eucoleus gastricus Eucoleus obtusiuscula Eucoleus oesophagicola Eucoleus perforans Eucoleus schvalovoj Eucoleus spiralis Eucoleus tenuis Eucoleus vanelli

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