Heterakis isolonche Linstow, 1906 – a new nematode species found in ornamental pheasants in Poland

Studies were carried out on 25 pheasants belonging to 13 Phasianinae species of the Phasianidae family. The research material was collected from private breeders – both Polish and from abroad. The results confirm that the most frequent nematode is Heterakis gallinarum, while for the first time in the country – in two of the examined birds of Polish flocks – the occurrence of Heterakis isolonche was found.