Mohammad Rafiq Siddiqi2014-06-302014-06-301983Revue Nematol. 6(2): 207-215 (1983)http://hdl.handle.net/123456789/3466Pachydorylaimus gen. n. and Tylenchodorus gen. n. belong to Qudsianematinae. P achy dory laimus furcatus gen. n., sp. n., P. pachyvulvus sp. n., P. longicaudatus sp. n., P. notabenus sp. n. and Tylenchodorus tylosus gen. n., sp. n. are described and illustrated from nematodes collected in Colombian rain forest during Colombian Amazonas Expedition. Pachydorylaimus differs from Eudorylaimus in having a truncate lip region, small oval amphid apertures, thice-walled odontostyle with prominently furcate base, odontophore with basal sclerotized (ianges and elongate pointed tail with a long terminal hyaline portion. Tylenchodorus gen. n. differs from other genera of the Qudsianematinae in having an odontophore provided with round basal knobsenArticle