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Free-living dorylaimid nematodes from nature reserves in Costa Rica. The genus Oriverutus Siddiqi, 1971 – species with specialised uterus

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For more content, see Nematologica.

Three Costa Rican Oriverutus species, one new and two known, are studied and described. Oriverutus belloi sp. n. is distinguished by its body length of 1.30-1.33 mm, lip region offset by depression and 9-9.5 μm broad, odontostyle 16 μm long, neck 356-369 μm long, pharyngeal expansion 158-164 μm long or 44% of total neck length, a dorsal cell mass present at level of anterior portion of intestine, female genital system amphidelphic, uterus long and tripartite with a differentiated intermediate section, V = 50-55, tail conical and slightly bent dorsad at the end (44-50 μm long, c = 27-30, c′ = 2.2-2.5), and males unknown. New data are provided for O. ecae, including diagnosis and comparison with its relatives. A SEM study is presented for O. tropicus and, this being the first such study for Oriverutus species, the peculiar pattern of its lip region is shown and explained in detail.

Affiliations: 1: Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus 'Las Lagunillas' s/n, Edificio B3, 23071 Jaén, Spain;, Email:; 2: Laboratorio de Nematologia, Escuela de Ciencias Agrarias, Universidad Nacional, AP 86-3000, Heredia, Costa Rica; 3: Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus 'Las Lagunillas' s/n, Edificio B3, 23071 Jaén, Spain


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