Abundant material of the nematode species Chitwoodiellus parafuscus (Peña-Santiago, 1991) Jiménez-Guirado & PeñaSantiago, 1992 collected from 17 localities in the south east of the Iberian Peninsula has been studied. Wide intraspecific variability in its measurements and ratios has been noted and analysed. Some of its morphological features are re-examined and revised, and a new concept of the species is proposed. SEM illustrations of this species, and also of the genus, are provided for the first time. Finally, a new diagnosis of the genus Chitwoodiellus and a compendium of its species are given.