REVISION OF THE GENUS TYLENCHOLAIMUS DE-MAN, 1876 - GENERAL DISCUSSION AND KEY TO THE SPECIES

General aspects of the morphology and taxonomy of the genus Tylenchola imus de Man, 1876 are described and discussed. The variability and tax onomic importance of several morphological features are evaluated. Int rageneric relationships are also analyzed but no division is proposed due to the impossibility of distinguishing clear natural groups; a lis t of the species included in the genus and a key to their identificati on are given. Relationships with other close genera are briefly discus sed; Pseudotylencholaimus (Jairajpuri & Ahmad, 1992) n. grad, is propo sed and P. viduus (Jairajpuri, 1965) Jairajpuri a Ahmad, 1992 is descr ibed and illustrated.