Description of Trichodorus gilanensis n. sp from a forest park in Iran and observations on Paratrichodorus tunisiensis (Siddiqi, 1963) Siddiqi, 1974 (Nematoda: Diphtherophorina)

A new trichodorid species, Trichodorus gilanensis n. sp. is described from a forest park in northern Iran. The new species is characterised in the male by three ventromedian cervical papillae with the anterior two at the level of the onchiostyle region, the posterior-most ventromedian procloacal supplement (SPI) at the level of the retracted spicule head, spicules smooth and manubrium continuous with shaft, and in the female by large triangular vaginal sclerotised pieces close to one another in lateral view, a barrel-shaped vagina, a transverse slit-like vulva in ventral view and a slightly swollen tail region. Three other trichodorid species found, T primitivus, Paratrichodorus porosus and P. tunisiensis represent new records for Iran.