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Nullonchus, a New Genus of Toothless Mononchs, With Comments On the Phylogenetic Relationship of Nullonchinae N. Subfam. (Nematoda: Mononchida)

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For more content, see Nematology.

Nullonchus n. gen. is proposed for three new species of toothless mononchs from the Colombian rain forest. Nullonchus levistomus n. sp. (type-species), N. rapax n. sp. and N. valens n. sp. are described and illustrated. The new subfamily Nullonchinae is unique among the Mononchida in lacking teeth, denticles or ridges. It is assigned to Anatonchidae and its phylogenetic relationship is discussed. A single, anteriorly placed dorsal tooth is considered an ancestral character of the Mononchida, in contrast to the three-tooth condition as previously believed.

Affiliations: 1: Commonwealth Institute of Parasitology, 395A Hatfield Road, St. Albans, England


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