Paratrichodorus is a genus of terrestrial root feeding (stubby-root)nematodes in theTrichodoridaefamily (trichorids), being one of five genera.[2] They are economically important plant parasites and virus vectors.[3] The females are didelphic (two genital tracts), and are distributed worldwide.[4]
Historically,Trichodorus formed the only genus in theTrichodoridae family. ThenTrichodorus was split into two genera in 1974 by Siddiqi,[1]Trichodorus andParatrichodorus. The genus, which is the second largest in the family consists of 34 species.[4] Siddiqi based the separation on the position of the gland nuclei and the type of pharyngo-intestinal junction.
Using the same characteristics as those establishing the genus, Siddiqi described three subgenera,Paratrichodorus,Atlantadorus andNanidorus, but Decraemer did not support the validity of this.[5] While the latter approach has not been accepted by some authorities,[5] Siddiqi elevated them to genus status in 1980,[6][7] an approach that few other authors have followed,[8] but maintained by that author,[9] and now receiving some support from modern molecular approaches totaxonomy. At least in the case ofNanidorus,phylogenetic analysis has supported its recognition as a separate genus, although clustering withTrichodorus rather than its parentParatrichodorus.[8][10]
^abSiddiqi, M.R. (1974). "Systematics of the genusTrichodorus Cobb, 1913 (Nematoda: Dorylaimida), with descriptions of three new species".Nematologica.19:259–278.
^Order Triplochida: Paratrichodorus Nemaplex: Nematode-Plant Expert Information System. University of California, Davis. Version October 9, 2012.
Blaxter, Mark L.; De Ley, Paul; Garey, James R.; Liu, Leo X.; Scheldeman, Patsy; Vierstraete, Andy; Vanfleteren, Jacques R.; Mackey, Laura Y.; Dorris, Mark; Frisse, Linda M.; Vida, J. T.; Thomas, W. Kelley (5 March 1998). "A molecular evolutionary framework for the phylum Nematoda".Nature.392 (6671):71–75.doi:10.1038/32160.PMID9510248.S2CID4301939.
De Ley, P & Blaxter, M 2004, 'A new system for Nematoda: combining morphological characters with molecular trees, and translating clades into ranks and taxa'. in R Cook & DJ Hunt (eds), Nematology Monographs and Perspectives. vol. 2, E.J. Brill, Leiden, pp. 633–653.
Duarte, Isabel; Neilson, Roy; Decraemer, Wilfrida; Brown, Derek; de Almeida, Maria Teresa M.; Marques (1 February 2010). "Phylogenetic relationships, based on SSU rDNA sequences, among the didelphic genera of the family Trichodoridae from Portugal".Nematology.12 (2):171–180.doi:10.1163/156854109X461721.hdl:1822/18363.
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