title: Morphological variation in Plagiorchis noblei Park 1936 (Trematoda: Plagiorchiidae) from Tyrannus tyrannus and T. verticalis (Aves: Tyrannidae).
abstract: Specimens of Plagiorchis noblei from Tyrannus tyrannus and T. verticalis, were analyzed for morphological differences using multivariate techniques. Hotelling's T2-test showed a highly significant difference (P less than 0.001) between the two parasite populations. A stepwise discriminant analysis selected pharynx and testis as the characters that best separated the two populations, and correctly classified 69% of the specimens as to their host species. Plagiorchis gonzalchavezi was determined to be a junior subjective synonym of P. noblei.
mesh_terms: D000818:Animals; D001717:Birds / Q000469:parasitology*; D005260:Female; D008297:Male; D010063:Ovum / Q000166:cytology; D010614:Pharynx / Q000033:anatomy & histology; D013223:Statistics as Topic; D013737:Testis / Q000033:anatomy & histology; D014200:Trematoda / Q000033:anatomy & histology* / Q000145:classification