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Description of Anatonchus Amiciae N. Sp. (Nematoda: Mononchidae) With Observations On Its Juvenile Stages and Anatomy

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For more content, see Nematology.

Anatonchus amiciae n. sp., found in orchard soil at Brescia (Italy), is described and figured; it differs from all previous species of Analonchus in that the posterior gonad of the female is degenerate. In the position of the teeth it comes nearest to A. tridentatus and A. ginglymodontus. The different position and attachment of the teeth in the latter two species are probably due to a different functional condition of the head and seem to have no diagnostic value. Number, orientation and position of the teeth in the buccal cavity are the most important features in separating the different juvenile stages. Only the third and fourth juvenile stages have three active teeth. The muscular arrangement in the cephalic region and the anatomy of the posterior body region in males have been studied in detail. Two sets of specialized muscles, the labial and stomatal muscles, occur in the cephalic region. In the posterior region of the male the musculature is very complicated and consists of copulatory muscles, accessory copulatory muscles, gubernacular muscles, spicular muscles and caudal copulatory muscles. The occurrence of rectal glands in the male is reported.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, England


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