Redescription of (Rudolphi, 1819) Lomakin, 1991 (Nematoda: ), a Parasite of (Gruiformes).

Introduction: (Rudolphi, 1819) Lomakin, 1991, is a species of which the systematic position is still unclear, and it is reported in the literature under many synonyms. In the present study, an attempt has been made at establishing the ultimate systematic position of against the backdrop of selected species.

Material And Methods: The parasites were identified based on measurements of external and internal structures. Ecological analysis of was carried out using the quantitative indices (frequency, prevalence, mean intensity, relative abundance, and dominance index). Statistical analyses (discriminant analysis) were performed on measurement data.

Results: The intestines of 77 coots were examined. They yielded a total of 398 parasites, including 67 identified as . Both males and females were located in the muscular gizzard. The morphometric analysis of in this study showed the dimensions of all the internal organs to be in agreement with measurements reported by other authors. The discriminant analysis, used to find the differences between the examined nematode species (, , , , and ), gave highly significant results (P < 0.0001) with respect to both males and females.

Conclusion: The results justify the separation of from the genus .