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Abstract
Two new species of the genus Crassolabium are described from natural areas in Vietnam. Crassolabium aenigmaticum sp. nov. is characterized by its body 1.23–1.58 mm long, lip region continuous, odontostyle 17.0–19.0 μm long, neck 320.0–397.0 μm long, uterus tripartite, pars refringens vaginae with two triangular pieces separated by an intermediate sclerotized area, V = 54–59, vulva longitudinal, tail short and rounded in both sexes, spicules 43.0–48.0 μm long, and seven to eight spaced ventromedian supplements. C. vietnamense sp. nov. can be distinguished in having body 1.55–1.88 mm long, lip region offset by constriction, odontostyle 19.5–22.0 μm long, neck 370.0–448.0 μm long, uterus very long and tripartite, pars refringens vaginae with two close together pieces, V = 55–59, vulva transverse and usually covered with a plug, tail short and rounded in both sexes, spicules 53.0–55.0 μm long, and eight to nine spaced ventromedian supplements, two of them within the range of spicules.
Acknowledgements
The senior author is thankful to Foundation of Institute of Ecology and Biological Resources (VAST) for financial assistance, and to the Andalusian Research Group on Nematology (Grupo Andaluz de Nematología within the Department of Animal Biology, Plant Biology and Ecology, Faculty of Experimental Sciences (University of Jaén, Spain) for providing financial support and facilities to complete this work successfully.