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Evolution Within the Family Mononchidae (Enoplida, Nematoda)

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For more content, see Nematology.

The course of evolution within the family Mononchidae is deduced from morphology and ontogeny as far as this is known. The division of the Mononchidae into two groups on the basis of the nature of the oesophago-intestinal junction and the shape of the base of the sclerotized stoma is considered to be an early, but strictly Mononchid development. Evolution within each of these lines is discussed. In both groups the main trend has been towards the reduction in size and eventual loss of the subventral teeth. In the non-tuberculate group subventral denticles appeared on the stoma walls, but in most genera these have become reduced, and tended to fuse to form subventral ridges (e.g. Prionchulus), but in most Mononchus spp. the ridges have been lost too.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts, England


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