Abstract
A new species, Tylencholaimushelanensissp. n., extracted from the rhizosphere soil of unidentified grasses from Helan Mountain, Inner Mongolia, China was identified. The new species is characterized by having a body length of 0.93–1.07 mm with the lip region approximately one-quarter of the body diameter at the posterior end of the neck region wide; female didelphic-amphidelphic; pars proximalis vaginae violin-shaped. Males were not found. SEM observations of the new species were made and a phylogenetic analysis of both the 18S rDNA and the D2-D3 region of 28S rDNA is presented.
Highlights
The genus Tylencholaimus de Man, 1876 is common in most soils all over the world and contains more than 50 valid species
In addition to the above characteristics used to differentiate the new species from its conspecifics, the pars proximalis vaginae of the new species should be noticed
It is so distinctive that in the 18S rDNA and 28S rDNA Bayesian trees, Tylencholaimus helanensis sp. n. forms a monophyletic clade with 100% support
Summary
The genus Tylencholaimus de Man, 1876 is common in most soils all over the world and contains more than 50 valid species. It is mainly characterized by having small body, cap-shaped lip region, weak odontostyle and knobbed odontophore. Peña-Santiago and Coomans (1994a, b, c, d; 1996a, b, c) revised the genus and its species, discussed the intrageneric variability and taxonomic value of some important morphological features such as the lip region, odontostyle, odontophore, pharynx, female genital system, tail and so on, and provided a key to the species. All the descriptions at the species level of these populations from China are lacking
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