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Histological studies on the anatomy of the parasitic stages of Australonema sp. (Nematoda: Marimermithida)

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image of Nematology
For more content, see Nematologica.

Parasitic stages (7-122 mm long) of Australonema sp. (Marimermithida, Enoplia) found in deep-sea polychaetes and in an echiurid from the Southern and Northern Atlantic, were studied histologically. The cephalic sensilla of the anterior end comprise six labial papillae and ten short cephalic papillae. The amphidial apertures are pore-like. Numerous tiny sensilla are distributed throughout the lateral regions of the body and there are eight hypodermal chords. A mouth opening, rectum and anus are all present. The pharynx is long and muscular with a triradial internal lumen, the pharyngeal glands opening almost at the apical part of the labia. The cardia is small with a triradial lumen. The midgut has a spacious lumen. The cervical excretory gland is two-cellular. The female genital system is amphidelphic, the germinal zone extending the length of the ovary (i.e., hologonic).


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