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Studies On the Ultrastructure of the Pharyngeal Region in Longidoridae (Nematoda)

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For more content, see Nematology.

A comparative E.M. study of the pharyngeal region of the genera Longidorus, Longidoroides, Paralongidorus and Xiphinema revealed the presence of flanges at the base of the odontophore in all these genera. However, in Xiphinema they are well developed with anchor-shaped endings, while they are variously developed in the other genera. This indicates that a reduction of the flanges has occurred inside the Longidorinae. The presence of four pairs of stylet retractors in Xiphinema vanderlindei is a new record for the family and considered to be a primitive condition. It adds further weight to the hypothesis that Xiphinema represents the oldest genus of the Longidoridae.

Affiliations: 1: ) Randse Afrikaanse Universiteit, Department Dierkunde, Postbus 524, Johannesburg 2000, R.S.A.; 2: ) Rijksuniversiteit Gent, Instituut voor Dierkunde, Ledeganckstraat 35, B-9000 Gent, Belgium; 3: ) Potchefstroom University for CHE, Department of Zoology, Potchefstroom 2520, R.S.A.


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