Abstract
The parasitic development of Tetradonema plicans Cobb in its host the glasshouse sciarid fly Bradysia paupera Tuom. is described and illustrated. In particular a study was made of the oesophageal tetrad and companion cells. Based on the study of these cells and a comparison between them and similar glandular cells in mermithids and other nematodes, the possible functions of companion cells are suggested. The short free-living period of the life cycle is described including a study of embryonation.
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