Abstract
It has not been possible to delineate species in the seed-gall nematode genus Anguina on morphological grounds alone. In this investigation twenty-five populations of Anguina from five host grasses (Agrostis capillaris, Lolium rigidum, Triticum aestivum, Holcus lanatus, Stipa scabra ssp. falcata) from Australia and New Zealand were studied for 20 loci using the technique of allozyme electrophoresis. The nematodes from the five host grasses showed few or no genetic differences within hosts but exhibited 65 to 80% genetic divergence between hosts. This work has (1) resolved the taxonomic status of the nematode associated with annual ryegrass toxicity, which is undoubtedly A. funesta, (2) indicated the value of a more sensitive form of comparison than morphology in the study of the relationships of nematodes in the genus Anguina and perhaps other plant-parasitic nematode genera and (3) added to the growing list of taxa exhibiting large genetic divergence without morphological divergence.
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