Acrobeles ciliatus (von Linstow, 1877) and Plectus parietinus (Bastian, 1865) are newly collected from Korea. Acrobeles is similar to those nematode belongs to Rhabditidae and Panagrolaimidae by having terminal bulb without medium bulb but different by having complex, vines shaped labial attachment. A. ciliatus differed from other Acrobeles species by lateral fields with two incisures, primary axils U-shaped, and secondary axils V-shaped. Head region set off with the neck, three high labial probolae present, each having 5 tines at inner margins and 5-7 at outer margins, and two elongate apical tines. Also, it differs from the longer female body. Plectus parietinus is distinguished from all other species of Plectus by the prominent hypodermal glands, the relatively small amphid, the distinct and well set-off lips and by the subdorsal distal caudal seta on the left side of the tail. Stoma without stylet. Oesophagus about 1/4 of total body length with terminal bulb. Anus ca. 100 μm from posterior extremity. Vulva is at middle of body. Have spinneret on tail tip.
Abolafia, J. and R. Peña-Santiago. 2004. Nematodes of the order Rhabditida from Andalucía Oriental, Spain. The genus Acrobeles von Linstow, 1877 with description of A. andalusicus sp. n. and a key to species. J. Nematode Morphol. Syst. 6:103-128.
Andrássy, I. 1985. The genus Plectus Bastian, 1865 and its nearest relatives (Nematoda: Plectidae). Acta Zool Hung. 31:1-52.
Andrássy, I. 2005. Free-living nematodes of Hungary (Nematoda Errantia), Volume I. Hungarian Natural History Museum, Hungary.
Amirzadi, N., S. Ebrahim and J. Abolafia. 2013. Description of nine species of the family Cephalobidae (Nematoda, Rhabditida) and morphometric analysis in the genus Acrobeles von Linstow, 1877. Acta Zool. Bulg. 65:3-26.
Bastian, H.C. 1865. Monograph of the Anguillulidae, or Free Nematoids, Marine, Land, and Freshwater; with Descriptions of 100 New Species. Linnean Soc. London. Volume XXV. Part II:73-184.
Bütschli, O. 1873. Beiträge zur Kenntnis der freilebenden Nematoden. Nova Acta Acad. Nat. Curios. 36:1-124.
Ebrahim S., J. Abolafia and Z. Javad. 2007. Nematodes of the order Rhabditida from Tehran province (Iran). The genus Acrobeles von Linstow, 1877 with description of A. iranicus sp. n. Nematology. 9:459-481.
Gerlach, S.A. 1963. Freilebende Meeresnematoden von den Malediven. II Kieler Meeresforsch. 19:67-103.
Maggenti, A.R. 1961. Revision of the genus Plectus (Nematoda: Plectidae). Proc. Helminth. Soc. Wash. 28:139-166.
Schuurmans Stekhoven, J.H. Jr and P.M. Mawson. 1954. Free-living nematodes, mostly from Asia. Arkiv för Zoologi. 18:273-279.