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Life history of rhabditis orbitalis a larval parasite in the eye orbits of arvicolid and murid rodents


Life history of rhabditis orbitalis a larval parasite in the eye orbits of arvicolid and murid rodents



Proceedings of the Helminthological Society of Washington 56(1): 1-7



ISSN/ISBN: 0018-0130

Whereas microbotrophic adults and developmental stages of Rabditis (Pelodera) orbitalis liver only in the nesting material of the host, its parasitic third-stage larvae have hitherto been found frequently in the conjunctival sacs of 15 species of mice and voles during the past .apprx. 30 years. In addition to the parasitic ("infective") larvae, the third stage may exist as dauer larvae as well as normal larvae, differing in morphological as well as ecological details. Only the infective larvae can successfully locate a host by the vibrations of the nesting material and by means of a thermotactic response. Food is taken up from the lachrymal fluid by endosmosis and is stored as fat in the intestinal cells. After 3-19 days in the conjuctival sac, larvae will leave the host but remain in the nesting material, where they molt twice to the adult stage. The phenomenon designated in this paper as "obligate parasitism" pertains only to the infective larvae.

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Accession: 007511950

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