Ecumenicus monohysterawas collected from the rhizosphere of faba bean (Vicia fabaL.) fields in Khuzestanprovince, south-western Iran. Morphological and morphometric data are provided for this species. Additionally,sequence of the D2-D3 expansion segments of 28S rRNA gene for this species wasalso used for molecularphylogenetic analysis. The phylogenetic relationships of E. monohysterain relation to representatives of the orderDorylaimida, obtained from Bayesian inference (BI) analysis of the D2-D3 sequences, are presented and discussed.
