Abstract
The larval heterosexual stages of Heterotylenchus, which are deposited on dung by parasitised muscid flies, possess cuticles similar to that of many other small free-living nematodes as seen with the electron microscope. The parasitic heterosexual female, from the haemocoel of the fly, has a quite different cuticle. Numerous canals ramify through the cuticle running from the hypodermis to the outer surface. It is tentatively concluded from electronmicrographs that the canals open to the exterior, but the point requires confirmation. In the parasitic parthenogenetic female, the canals are absent and the cuticle is weakly developed.
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