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Species of Discolaimus (Nematoda: Dorylaimoidea) From Australia

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Five species of Discolaimus collected from Australian mallee soils are described: D. major, D. texanus and three new species. In each species the lip region is an expanded, saucer shaped disc with distinct rim, divided by grooves into six sectors on the anterior surface, and variously lobed on the under surface. D. agricolus n. sp., monosexual, L = 1.30-1.73 mm, V = 45-48, odontostyle = 21-23 μm, has a multi-lobed lip region similar to D. major and an anterior oesophagus of uniform diameter throughout. D. silvicolus n. sp., monosexual, L = 1.16-1.89 mm, V = 51-53, odontostyle 20-22 μm, has a distinctively lobed lip region and prominent sheath around the basal oesophageal expansion. D. elegans n. sp., monosexual, L = 1.11 to 1. 20 mm, V = 50-53, odontostyle 14-15 μm, has three rows of lateral body pores. In D. major, D. agricolus and D. silvicolus a group of large cells of unknown function is present in the cardiac region. Two subventral longitudinal grooves in the odontostyle and numerous ventral and dorsal body pores are present in all five species.

Affiliations: 1: CSIRO Division of Horticultural Research, Merbein, Victoria 3505, Australia


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