Abstract
Larval biology of the habronemid nematode Cyrnea (Cyrnea) eurycerca Seurat, 1914, parasite of the Double-spurred Francolin Francolinus bicalcaratus, in Togo, is experimentally studied with the orthopteran Acrididae Tylotropidius patagiatus Karsch as intermediate host. The first three larval stages are described and illustrated. Infective larvae, which occur after two weeks of development at 30 degrees C, are unusually large (3 mm). The biology of this habronemid nematode is compared with the biology of the other Spirurids. It differs by: --an asynchronous penetration of the first stage larvae in the insect adipose tissue, --a short stay in this tissue (about 5 days) with a cell reaction of encapsulation, followed by an active escape of second stage larvae out of their capsule, --free and movable infective larvae in the hemocoele of the insect.
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