Abstract

Abstract A study was undertaken to elucidate the mode of entry of Coelomomyces opifexi into Aedes australis larvae and the copepod intermediate host, Tigriopus sp. cf. angulatus, using the fluorescent antibody technique coupled with direct examination of whole mounted specimens under the light microscope. Zygotes and zoospores of C. opifexi attached and encysted on the cuticle of mosquito larvae and copepods respectively; their overall distribution on the cuticle is described. Penetration by zygotes and zoospores appears to be mainly confined to the intersegmental membranes. The zygote protoplasm is injected through the cuticle, and forms a hyphal body which may either be released to circulate in the haemolymph or remain attached to the epidermal layer. The development of the hyphal body in the mosquito coelom is discussed.

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