Abstract
The larval development in the intermediate host of threeRaillietiella species which utilize lizards as definitive hosts and insects as intermediate hosts has been studied. In experimentally infected cockroaches (Periplaneta americana) early larval development involves three moults to an infective fourth-stage larva which appears from six weeks post-infection. The three successive larval stages in the intermediate host that develop in the haemocoel encysted by cells of the arthropod host differ in size of the body, length of the hooks, and number of chitinized spines in the penetration apparatus. Their metamorphosis occurs progressively, comparable to the development in hemimetabolic insects where the successive larval stages differ but gradually, too. The infective fourth-stage larvae of lizard raillietiellids which develop in arthropods are so similar in size and overall morphology to the known “larves infectantes” of snake raillietiellids found in lizard intermediate hosts (Fain 1961, 1964) that a fourth-stage larva is to be expected as infective larva not only of lizard raillietiellids but also of snake raillietiellids.
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