A new species ofProcyrnea(Nematoda: Habronematidae) parasitic inRhea pennata(Aves: Rheidae) from Patagonia, Argentina, with a key to species of the genus

Abstract

AbstractProcyrnea choiquen. sp. is described from the lesser rhea,Rhea pennatad´Orbigny (Aves: Rheidae), from the Protected Natural Area Península Valdés, Chubut province, Argentina. The new species resemblesP. ficheuri,P. murrayi,P. excisiformis,P. dollfusi,P. haliasturi,P. anterovulvata,P. graculae,P. brevicaudata,P. uncinipenis,P. javaensis,P. ameerae,P. ornata,P. aegotheles,P. spiralis,P. ruschiiandP. aptera, mainly in the absence of lateral alae; but differs from its congeners by having a left spicule without barbs, the position of the vulva which is post-equatorial, the absence of lateral ridges, absent median precloacal papilla, asymmetrical caudal alae, males more than 6 mm long, left spicule 1 mm long and spicule ratio 1:3. Our results extend the taxonomy ofProcyrneaChabaud, 1958 and comprise the first report of a habronematid fromR. pennata.A key to species ofProcyrneais presented.