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The Oesophago-Intestinal Valve and the Intestine in Tylenchids (Nematoda)

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image of Nematologica
For more content, see Nematology.

In the few tylenchids in which the oesophago-intestinal valve structure has been elucidated it consists of two cells; in all cases the actual valve is only a few micrometers long. As in the Rhabditida, the intestine in tylenchids consists essentially of two rows (one dorsal, one ventral) of a few elongated cells. Separate cells with microvilli and a differentiation in anterior and mid-intestine are found in the more primitive families Aphelenchidae, Aphelenchoididae, Tylenchidae, Anguinidae and Neotylenchidae. In the evolutionary line from Tylenchidae to Heteroderidae cell walls and microvilli progressively disappear. The absence of microvilli indicates the absence of the production of digestive enzymes and the transformation of the intestine into a food storage organ; it is hypothesised that in these cases the intestine selectively absorbs nutrients from the extra-corporal digested plant juice.

Affiliations: 1: Laboratorium voor Morfologie en Systematiek der Dieren, Rijksuniversiteit Gent, K.L. Ledeganckstraat 35, 9000 Gent, Belgium


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