Phylogenetic relationships among Xiphinema and Xiphidorus nematode species from Brazil inferred from 18s rDNA sequences

Claudio M.G. Oliveira*, Judith Hübschen, Derek J.F. Brown, Luiz C.C.B. Ferraz, Frank Wright, Roy Neilson

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

49 Citations (Scopus)


Maximum likelihood trees produced from 18S rDNA sequences separated 14 Xiphinema and five Xiphidorus nematode species from Brazil into distinct groups that concurred with their current morphological taxonomic status. Species belonging to the X. americanum group (X. brevicolle, X. diffusum, X. oxycaudatum, and X. peruvianum) formed a single group that was clearly separated from the other Xiphinema species. As with previous taxonomic studies that noted only minor morphological differences between putative X. americanum group species, separation of these species based upon 18S rDNA sequences was inconclusive. Thus it is probable that instead of comprising distinct species, the X. americanum group may in fact represent numerous morphotypes with large inter- and intra- population morphological variability that may be environmentally driven. Within the cluster representing non X. americnnum group species, there was little statistical support to clearly separate species. However, three subgroups, comprising (i) the X. setariae/vulgare complex, (ii) X. ifacolum and X. paritaliae, and (iii) X. brasiliense and X. ensiculiferum were well resolved.

Original languageEnglish
Pages (from-to)153-159
Number of pages7
JournalJournal of Nematology
Issue number2
Publication statusPublished - Jun 2004
Externally publishedYes


  • 18s rDNA
  • Longidorid
  • Molecular systematics
  • Plant-parasitic nematode
  • Ribosomal DNA
  • Xiphidorus
  • Xiphinema


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