'n Morfologiese studie van sekere Suid-Afrikaanse Longidoridae en Tobrilidae met behulp van skandeerelektronmikroskopie


M. Sc.The first part of this study deals with some aspects of the morphology of the family Longidoridae. The main morphological features are discussed, followed by a brief review of the taxonomic history of the group and diagnoses of the genera Xiphinema, Xiphidorus, Paralongidorus, Longidorus and Longidoroides. A detailed description is then given of the method used for preparation of specimens for viewing with the scanning electron microscope. The ultrastructure of the stylet, the head region and the cuticular structure of some representative species of the South African genera of Longidoridae were studied, and the . results are shown on photomicrographs and discussed. Based on these results and through out-group comparison, an attempt was made to establish the characteristics of longidorid ancestry and the interrelationships of the different genera. In the second part of the study, Eutobrilus heptapapillatus (Joubert & Heyns, 1979) Tsalolikhin, 1981 is redescribed from specimens collected in the Tsitsikama Forest and Coastal National Park. These specimens showed some remarkable morphological features which are described in the text. Of particular interest is an exceptionally well-developed glandular system in the .region of the nerve ring and the base of the eosaphagus. The indoxyl acetate method for non-specific esterases was used to determine the nature of this system.and the results are discussed in the text

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