An 18S rDNA perspective on the classification of criconematoidea

Thomas O Powers, Timothy Harris, Rebecca Higgins, Peter Mullin, Kirsten Powers

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In the nematode family Criconematidae, a taxonomy primarily based on cuticle characters has created classifications that are notoriously volatile. Molecular characters may lead to their stabilization. A phylogenetic tree of Criconematoidea was constructed using 166 new near full-length 18S rDNA sequences and 58 sequences from GenBank. Bayesian and maximum likelihood (ML) analyses produced trees with similar topologies. Major features include a strongly supported clade that includes Criconematidae and Hemicycliophoridae, excluding Paratylenchidae and Tylenchulidae. Another well-supported clade groups Criconema, Ogma, Crossonema, and Hemicriconemoides plus Xenocriconemella, combining nematodes with cuticular scales with those without scales at any life stage. Mesocriconema, Discocriconemella limitanea, Hemicaloosia, and Lobocriconema are recognized as monophyletic groups, but Criconemoides is paraphyletic. Both trees support an unexpected sister relationship between Bakernema and Hemicycliophora. The 18S rDNA dataset was insufficient for distinguishing genus boundaries between Criconema, Ogma, and Crossonema. The relationships depicted by the 18S rDNA phylogeny suggest that key morphological characters used in the classification of Criconematidae are not homologous.

Original languageEnglish (US)
Pages (from-to)236-244
Number of pages9
JournalJournal of Nematology
Volume49
Issue number3
StatePublished - Sep 1 2017

Fingerprint

Criconematidae
Ogma
Criconema
taxonomy
Paratylenchidae
Discocriconemella
Tylenchulidae
Hemicriconemoides
Criconemoides
Hemicycliophora
Mesocriconema
Nematoda
phylogeny
topology

Keywords

  • 18s rDNA
  • Classification
  • Criconematidae
  • Phylogeny
  • Systematics
  • Taxonomy

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Powers, T. O., Harris, T., Higgins, R., Mullin, P., & Powers, K. (2017). An 18S rDNA perspective on the classification of criconematoidea. Journal of Nematology, 49(3), 236-244.

An 18S rDNA perspective on the classification of criconematoidea. / Powers, Thomas O; Harris, Timothy; Higgins, Rebecca; Mullin, Peter; Powers, Kirsten.

In: Journal of Nematology, Vol. 49, No. 3, 01.09.2017, p. 236-244.

Research output: Contribution to journalArticle

Powers, TO, Harris, T, Higgins, R, Mullin, P & Powers, K 2017, 'An 18S rDNA perspective on the classification of criconematoidea', Journal of Nematology, vol. 49, no. 3, pp. 236-244.
Powers TO, Harris T, Higgins R, Mullin P, Powers K. An 18S rDNA perspective on the classification of criconematoidea. Journal of Nematology. 2017 Sep 1;49(3):236-244.
Powers, Thomas O ; Harris, Timothy ; Higgins, Rebecca ; Mullin, Peter ; Powers, Kirsten. / An 18S rDNA perspective on the classification of criconematoidea. In: Journal of Nematology. 2017 ; Vol. 49, No. 3. pp. 236-244.
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