A new spiral nematode Helicotylenchus asiaticus n. sp., recovered from sandy rhizosphere of Poa pratensis from Korea, is characterized based on integrative taxonomy, considering both morphological and molecular phylogenetic inferences from analyses of the 28S-rRNA and ITS-rRNA gene sequences. Additionally, H. caudatus is characterized for the first time outside its type locality; notes on the taxonomic status of H. microlobus are stated, and the existence of H. dihystera in Korea is molecularly confirmed. The new species is characterized by a lip region not offset; hemispherical, bearing 4–5 annuli; stylet knobs sloping posteriorly, rarely anteriorly flattened; spermatheca, offset and filled with sperms; incisures of the lateral field areolated in pharyngeal region, with incomplete areolation in the tail region; inner incisures usually distally modified into a u-shape or y-shaped configuration; phasmids postanal, situated at 3–8 annuli posterior to anus level; tail conical, bearing 8–15 annuli, ending in a rounded to pointed extremity; and males abundant. The new species is morphologically similar to H. erythrinae, H. californicus, H. electropicus, H. tropicus, H. conicus, H. elegans, H. interrogativus, H. saxeus, H. certus and H. silvaticus but differs from all, either by lip region shape, stylet knob shape, sperm filled spermatheca, phasmid position, tail termini shape and (or) presence of males. Sequence data analyses from amplified regions suggest that Helicotylenchus asiaticus n. sp. is a sister species to unidentified Helicotylenchus sp. From Korea.

一种新的螺旋线虫Helicotylenchus asiaticus n。从韩国Poa pratensis的沙质根际中回收的sp。sp。的特征是基于综合分类法，同时考虑了28S-rRNA和ITS-rRNA基因序列分析的形态学和分子系统发育推断。此外，首次在其类型区域之外对H. caudatus进行了表征。在分类地位笔记H. microlobus列示，并存在H. dihystera在韩国已经得到分子证实。新物种的特征是唇部区域不偏移。半球形，轴承4-5；管心针旋钮向后倾斜，很少向前展平；精子，偏移并充满精子；咽部区域的侧向电场减弱，尾部区域的侧向散射不完全；内部切口通常向远端修改为U形或Y形配置；肛门后突部，位于肛门后3–8瓣环；尾圆锥形，具8-15的环面，末端为圆形至尖端。和男性丰富。该新种形态上类似于H. erythrinae，H.加利福尼亚小，H. electropicus，H. tropicus，H. conicus，H.线虫，^ h。interrogativus，^ h。saxeus，H. CERTUS和ħ。silvaticus，但在唇部区域形状，通心针旋钮形状，精子充满的精子，囊粒位置，尾部末端形状和（或）雄性方面与众不同。从扩增区域进行的序列数据分析表明，Helicotylenchus asiaticus n。sp。是未鉴定的Helicotylenchus sp。的姐妹种。来自韩国。