New filarial nematode from Japanese serows (Naemorhedus crispus: Bovidae) close to parasites from elephants

Parasite

and H. Takaoka⁴  T. Yanai⁵  M. Baba¹  A. Katsumi²  T. Agatsuma³  O. Bain⁶  S. Uni⁶ 

[1] Kitakyushu Museum and Institute of Natural History,Kitakyushu,Japan;Animal Husbandry Research Center, Yamagata-ken Agricultural Co-op,Yamagata,Japan;Department of Environmental Health Science, Faculty of Medicine, Kochi University,Nankoku,Kochi,Japan;Department of Infectious Disease Control, Faculty of Medicine, Oita University,Japan;Department of Veterinary Pathology, Faculty of Applied Biological Science, Gifu University,Japan;Parasitologie Comparée et Modèles Expérimentaux, Associée à l’INSERM (U567), CNRS IFR 101, Muséum National d’Histoire Naturelle,Paris,France

关键词: Japan;    host-switching;    elephant;    Bovidae;    Caprinae;    serow;    Naemorhedus crispus;    Onchocercidae;    Loxondontofilaria caprini n. sp.;   

Others  :  808686
DOI  :  doi:10.1051/parasite/2006133193

 received in 2006-04-08, accepted in 2006-07-11,  发布年份 2006

【 摘 要 】

A new onchocercid species, Loxodontofilaria caprini n. sp. (Filarioidea: Nematoda), found in subcutaneous tissues of 37 (33%) of 112 serows (Naemorhedus crispus) examined in Japan, is described. The female worm had the characteristics of Loxodontofilaria, e.g., the large body size, well-developed esophagus with a shallow buccal cavity, and the long tail with three caudal lappets. The male worm of the new species, which was first described in the genus, had unequal length of spicules, 10 pairs of pre- and post-caudal papillae, and three terminal caudal lappets. Deirids were present in both sexes. Among four species of the genus Loxodontofilaria: one from the hippopotamus and three from the Elepantidae, L. caprini n. sp. appears close to L. asiatica Bain, Baker & Chabaud, 1982, a subcutaneous parasite of Elephas indicus in Myanmar (Burma). However, L. caprini n. sp. is distinct from L. asiatica in that the Japanese female worm has an esophagus half as long and the microfilariae also half as long with a coiled posterior. The microfilariae were found in the skin of serows. The new parasite appears to clearly illustrate a major event in the evolution of onchocercids: the host-switching. This might have occurred on the Eurasian continent, where elephantids and the lineage of rupicaprines diversified during the Pliocene-Pleistocene, or in Japan, into which some of these hosts migrated.

【 授权许可】

   
© PRINCEPS Editions, Paris, 2006