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Contribution to the knowledge of the parasite fauna of argentina xv. morphological study of heteroxynema viscaciae new species nematoda heteroxynematidae a parasite of lagidium viscacia boxi mammalia rodentia



Contribution to the knowledge of the parasite fauna of argentina xv. morphological study of heteroxynema viscaciae new species nematoda heteroxynematidae a parasite of lagidium viscacia boxi mammalia rodentia



Systematic Parasitology 13(2): 111-120



Heteroxynema (Cavioxyura) viscaciae n.sp., parasitic in the caecum and large intestine of Lagidium viscacia boxi Thomas, is described. The most closely related species is Heteroxynema (Cavioxyura) chiliensis Quentin, 1975, a parasite of Octodon degus (Molina) from Chile, from which the new species differs by its measurements and disposition of the male's genital papillae. Study of this new species shows the existence of: (i) a type of sexual dimorphism infrequent in the Oxyuroidea, at the level of the buccal structures; (ii) only four pairs of male genital papillae adjoining cuticular protuberances which in other species may have been confused with supplementary nerve endings; (iii) a gubernaculum and a spicule, structures infrequently observed in the Heteroxynematidae, and possibly overlooked or ignored in other species; (iv) a sphincter which is strongly differentiated and developed.

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