FIGURE 10 in Taxonomic review of Thoracostomopsidae (Nematoda, Enoplida): state of the art, list of valid species and dichotomous keys

FIGURE 10. Diagnostic key to species of Trileptium based on the morphology of adult males. 1: Cuticle annulated, gubernaculum absent; 2: Cuticle smooth or annulated, gubernaculum present; 3: Buccal cavity with a single forwardly-directed dorsal onchium; 4: Buccal cavity with dorsal and two sub-ventral onchia; 5: Precloacal supplement absent, gubernaculum without apophysis; 6: Precloacal supplement present, gubernaculum with a dorso-caudal apophysis; 7: Precloacal supplement absent; 8: Precloacal supplement present; 9: Dorsal onchium does not reach the mandibular transverse bar, ventrosublateral onchia extend beyond bar; 10: Dorsal and ventrosublateral onchia at same level, extend beyond mandibular bar; 11: Precloacal supplement close to cloaca (6–11 µm); 12: Precloacal supplement not close to cloaca (29 µm); 13: Spicules strongly curved distally, gubernaculum with ventral peg, loops over both spicules; 14: Spicules shallow arcs, gubernaculum does not loop over spicules; 15: Gubernaculum with dorso-caudal apophysis; 16: Gubernaculum without apophysis; 17: Tail long and thin, 5 abd; 18: Tail ≤ 4 abd; 19: Spicules length> 8 abd; 20: Spicules length <4 abd; 21: Tip of gubernaculum ends in small plates each, with two lateral projections; 22: Spicules cylindrical tapering to point, gubernaculum reduced to knob obscuring spicules tip.