Family Tylenchidae (Nematoda): an overview and perspectives

Mitochondrial COI gene is valid to delimitate Tylenchidae (Nematoda: Tylenchomorpha) species

“…Tylenchidae is a widely distributed soil-inhabiting nematode family characterized by a weak stylet, an undifferentiated non-muscular pharyngeal corpus, and a filiform tail. Currently, it comprises 412 nominal species belongs to 44 genera and estimated species number ranged from 2,000 to 10,000 species ( Qing and Bert, 2019 ). Regardless of their abundance, the delimitation of taxa in this group remains poorly documented and highly uncertain.…”

“…Regardless of their abundance, the delimitation of taxa in this group remains poorly documented and highly uncertain. Consequently, there is no consensus regarding their classification from species level up to family level ( Andrássy, 2007 ; Brzeski, 1998 ; Qing and Bert, 2019 ; Siddiqi, 2000 ).…”

“…Among marker genes, the ribosomal RNA (rRNA) genes are being used as the standard barcode for almost all animals and successfully resolved several groups in Nematoda ( Bert et al, 2008 ; Holterman et al, 2006 ; Subbotin et al., 2006 ). However, rRNA genes are problematic in Tylenchidae phylogeny and the unresolved status is unlikely to be improved by intensive species sampling ( Qing et al, 2017 ; Qing and Bert, 2019 ). Therefore, finding a proper molecular marker gene is crucial for the Tylenchidae study.…”

Cephalenchus driekieae n. sp. (Nematoda: Tylenchidae) from South Africa, a new member of the genus with a long pharyngeal overlap

“…soil, algae, fungi, and plant material ( Panahandeh et al, 2018 ). Currently, approximately 44 genera and 412 species are known in this family ( Qing and Bert, 2019 ). Traditionally, most tylenchids were identified based solely on morphological characters ( Geraert, 2008 ), which led to taxonomic confusions within the family ( Qing and Bert, 2019 ).…”

“…Currently, approximately 44 genera and 412 species are known in this family ( Qing and Bert, 2019 ). Traditionally, most tylenchids were identified based solely on morphological characters ( Geraert, 2008 ), which led to taxonomic confusions within the family ( Qing and Bert, 2019 ). However, in recent years, DNA-based techniques have been extensively used for taxonomic studies of tylenchids ( Bert et al, 2010 ; Pereira and Baldwin, 2016 ; Pereira et al, 2017 ; Pedram et al, 2018 ; Panahandeh et al, 2018, 2019 ; Qing and Bert, 2019 ).…”