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The Life Cycle of an Endoparasite in Some Tylenchid Nematodes

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For more content, see Nematology.

The development of a nematode endoparasite, previously erroneously described as a microsporidian, Duboscqia penetrans Thorne, was studied in populations of Meloidogyne javanica, M. incognita, and also in Helicotylenchus dihystera, Merlinius macrurus and Tylenchorhynchus sp. Protoplasts from spores penetrate through the cuticle of larvae. The parasite develops in the pseudocoelomic fluid into irregular vegetative thalli or filaments, which break up or appararently reproduce asexually into numerous units. At maturity spores develop at the distal ends of dichotomous branches of the thallus, eventually filling the body of the host and causing its death. Spores are disseminiated when the host disintegrates. The life cycle is unlike known protozoons but resembles a bacterium.

Affiliations: 1: Department of Nematology, University of California, Riverside, California 92502, U.S.A.


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