Rotylenchus wimbii n. sp. (Nematoda: Hoplolaimidae) associated with finger millet in Kenya

Phougeishangbam Rolish Singh*, Gerrit Karssen, Kelvin Gitau, Cecilia Wanjau, Marjolein Couvreur, Njira Njira Pili, Godelieve Gheysen, Wim Bert

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

Rotylenchus wimbii n. sp. was found associated with finger millet in Kenya and is described based on light microscopy, scanning electron microscopy, and molecular information. Sequence analysis was performed on ITS, 18S, and D2-D3 of 28S of ribosomal DNA and COI of mitochondrial DNA. This new species is characterized by a moderate female body size of 0.6 to 0.8mm, a continuous hemispherical lip region with four annuli, 3 to 4 irregular blocks on the basal lip annule, absence of longitudinal cuticular striations in anterior region, four lateral lines forming three equal bands which are areolated mainly at pharynx level, a robust stylet of 23 to 27µm of which 45 to 53% is cone part, and with rounded to sometimes indented knobs, a secretory-excretory pore around level of pharyngo-intestinal junction, didelphic-amphidelphic reproductive system, vulva without distinct epiptygma, indistinct to empty spermatheca, tail usually truncated with 5 to 9 annuli, phasmids located at 7 to 17 annuli anterior to anus, and absence of males. Molecular phylogenies, in combination with species delimitation, supported the distinctiveness of Rotylenchus wimbii n. sp. and revealed some mislabeled Rotylenchus brevicaudatus sequences in GenBank.

Original languageEnglish
Article numbere2021-016
JournalJournal of Nematology
Volume53
DOIs
Publication statusPublished - 22 Feb 2021

Keywords

  • 18S
  • 28S
  • COI
  • Finger millet
  • ITS
  • Kenya
  • Morphometrics
  • New species
  • Phylogeny
  • Plant-parasitic nematodes
  • Rotylenchus
  • SEM
  • Systematics
  • Taxonomy

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