Due to importance and effectiveness of some entomopathogenic or insect parasitic nematodes
in controlling of agricultural pests, or pests of non-agricultural plants, a study was
conducted in order to identify the species of this group of nematodes in city of Tehran.
As the result, three species belonging to the genus Oscheius were recovered in association
with bark samples having the bark beetle galleries. Morphological and molecular data
were provided for two recently recovered species of the genus, namely O. necromenus and
O. onirici. Molecular data were also provided for a recently recovered isolate of O. tipulae.
All three species were recovered in association with bark samples collected from dead
trees in the city of Tehran. Morphological characters and morphometric data of the two
aforementioned species are in accordance with the data given in their original descriptions.
One recovered individual from a small bark sample characterized by its short body length
was sequenced for its 28S and internal transcribed spacer (ITS) rDNA loci, and the results
of BLAST search using the newly obtained partial sequences revealed that it belonged to
O. tipulae. Molecular phylogenetic studies revealed recently sequenced Iranian populations
of O. onirici and O. tipulae forming a clade with other isolates/populations of these species
in ITS tree with maximal Bayesian posterior probability (BPP), and presently sequenced
isolates of O. tipulae and O. necromenus form a clade with other isolates of these species in
28S tree. The two species O. onirici and O. necromenus were reported in Iran for the first
time.
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