A new species, Malenchus sexlineatus n. sp., discovered from the Philippines, is described based on morphological and molecular data. The new species is unusual in the genus by having six lateral lines. Malenchus sexlineatus n. sp. is distinguished from M. williamsi, the only other species in the genus with six lateral lines (based on currently available SEM data), by a shorter body of 278 (270-288) vs 452 (425-495) μm, shorter stylet (7.0 (6.2-7.5) vs 11-12 μm), narrower annulations (0.8 (0.7-0.8) vs 1.2-1.6 μm), lateral field comprising one elevated ridge in LM vs six well-separated incisures (resembling the lateral lines in Cephalenchus) in LM, the presence of S-shaped vs straight amphidial apertures, and vulval flaps absent or only one annuli long vs distinct. By having an exceptionally short body, M. sexlineatus n. sp. comes close to M. parvus, M. bryanti and M. acarayensis. However, there are significant differences in the lateral lines, annuli width and most morphometric ratios. Three known species, namely M. exiguus, M. nanellus and M. pachycephalus, all being first records and first representative from China, are characterised by morphological data. The new species was placed in a robustly supported clade containing two other Malenchus spp. and M. exiguus. Interestingly, M. pressulus was placed in a separate, unresolved phylogenetic position. However, the phylogenetic position of these clades could not be resolved within Tylenchidae. The shapes of the amphidial aperture and fovea within Malenchus are also compared and its possible developmental process is illustrated and discussed.
The genera and species of the family Tylenchidae Orley, 1880 (Nematoda). The genera Aglenchus (Andrássy, 1954) Meyl, 1961, Michulenchus Andrássy, 1959, and Polenchus gen. n.Acta Zoologica Academiae Scientiarum Hungaricae261-20.
Free-living nematodes of Hungary II (Nematoda errantia). Pedozoologica HungaricaVol. 4 (Series editors:
CsuzdiC.MahunkaS.). Budapest, HungaryHungarian Natural History Museum and Systematic Research Group of the Hungarian Academy of Sciences.
Redescription of Filenchus annulatus (Siddiqui & Khan, 1983) Siddiqi, 1986 based on specimens from Iran with contributions to the molecular phylogeny of the Tylenchidae.
Morphological, morphometrical and molecular characterisation of Filenchus fungivorus n. sp., a fungivorous nematode from Japan in a most likely polyphyletic genus (Nematoda: Tylenchina).
Three-dimensional reconstruction of the amphid sensilla in the microbial feeding nematode, Acrobeles complexus (Nematoda: Rhabditida).
Journal of Comparative Neurology512271-281.
Three Malenchus species from Spain (Nemata: Tylenchidae) with a note on the amphidial opening in the genus.
Fundamental and Applied Nematology15153-157.
HoltermanM.van der WurffA.van den ElsenS.van MegenH.BongersT.HolovachovO.BakkerJ.HelderJ. (2006).
Phylum-wide analysis of SSU rDNA reveals deep phylogenetic relationships among nematodes and accelerated evolution toward crown clades.
Molecular Biology and Evolution231792-1800.
Múnera UribeG.E.BertW.VierstraeteA.R.de la PenaE.MoensM.DecraemerW. (2010).
Burrowing nematodes from Colombia and their relationship with Radopholus similis populations, R. arabocoffeae and R. duriophilus.
van MegenH.van den ElsenS.HoltermanM.KarssenG.MooymanP.BongersT.HolovachovO.BakkerJ.HelderJ. (2009).
A phylogenetic tree of nematodes based on about 1200 full-length small subunit ribosomal DNA sequences.