Molecular rDNA phylogeny of Telotylenchidae Siddiqi, 1960 and evaluation of tail termini
2010
Three stunt nematode species, Tylenchorhynchus leviterminalis, T. claytoni and Bitylenchus dubius were characterized with segments of small subunit 18S and large subunit 28S rDNA sequences and placed in molecular phylogenetic context with other taxa of Telotylechidae in GenBank. In 18S trees, the species within the Merliniinae formed a monophyletic group, however there were two to three nested clades of Telotylenchinae taxa in alternative trees. Two putative species of Neodolichorhynchus and two Trophurus species also failed to group together. Distribution of various morphological features including stylet lengths, pharyngeal gland lengths, tail shapes and vulval appendages were characterized for included taxa. Thick-tailed T. leviterminalis from Asia grouped closely with relatively thin-tailed T. claytoni and T. nudus. Bitylenchus dubius clustered with long stylet-bearing Macrotrophurus (Macrotrophurinae) some distance from the other Tylenchorhynchus spp. Conflicting generic and family nomenclature are discussed in light of morphological character distribution.
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