Genus Willinema
Baqri & Jairajpuri, 1967
Photo Gallery- Haughton Crater
Diagnosis:  Small- to medium-sized nematodes (L = 0.5-1.3 mm).  Lip region amalgamated and continuous with body contour or offset by depression or constriction.  Labial and post-labial sclerotization absent.  Amphids with stirrup-shaped fovea and conspicuous fusus amphidialis.  Odontostyle cylindroid.  Basal expanded part of esophagus about 32-44% of total esophageal length.  Female reproductive system mono-opisthodelphic; anterior genital branch reduced to a uterine sac but occasionally anatomically complete though much smaller (than posterior branch) and non-functional; posterior genital branch normal.  Vulva pre- or post-equatorial.  Vagina distally sclerotized.  Males with dorylaimoid spicules, lateral guiding pieces and a series of widely-spaced ventromedian supplements.  Tail short, convex-conoid or cylindrical, similar in sexes.

Type species:   Willinema parvum (Williams, 1959) Baqri & Jairajpuri, 1967
              Syn:   Labronema parvum Williams, 1959
                       Thornenema parvum (Williams, 1959) Williams, 1964

Other species:
                       W. brunetti (Meyl, 1953) Andrassy, 1986
                                Syn:  Dorylaimus brunetti Meyl, 1953
                                       Eudorylaimus brunetti (Meyl, 1953) Andrassy, 1959
                       W. eburnense Carbonell & Coomans, 1985
                       W. laopagense Carbonell & Coomans, 1985
                       W. nanum Carbonell & Coomans, 1985
                       W. opisthodelphus (Thorne & Swanger, 1936) Andrassy, 1986
                                Syn:  Dorylaimus opisthodelphus Thorne & Swanger, 1936
                                       Eudorylaimus opisthodelphus (Thorne & Swanger, 1936) Andrassy, 1959
                       W. paraparvum Carbonell & Coomans, 1985