Male 4·5 to 5·5 mm. long, in front of bursa 0·08 mm. thick; spicule 0·126 to 0·134 mm. long, gubernaculum 0·075 to 0·08 mm. long. Bursa: latero-anterior rib thickest; antero-external thicker than antero-median, postero-median and postero-external very short and close together. Female 4·5 to 6 mm. long, vulval opening 1·08 to 1·25 mm. from tip of tail, placed longitudinally, and slightly curved, 76 µ long, always longer than the unpaired portion of the ovejector; anus 0·040 to 0·05 mm. distant from tip of tail. Posterior end thick, point of tail short. Ova 76 µ to 80 µ by 43 µ to 46 µ.
Fig. 311.—Trichostrongylus probolurus: tail of male from left side. d., posterior; e.d., postero-external; p.l., postero-median; m.l., antero-median; e.l., antero-external; l.v., latero-anterior; v.v., antero-anterior; gub., portion of gubernaculum; sp., portion of spicules. × c. 300. (After Looss.)
Fig. 312.—Trichostrongylus probolurus: spicules and gubernaculum of male; on left, ventral view; on right, lateral view. × c. 300. (After Looss.)
Habitat.—In the duodenum of Ovis aries, O. laticauda, Antilope dorcas, Camelus dromedarius (Egypt) and occasionally also in man (Egypt).
Trichostrongylus vitrinus, Looss, 1905.
Male 4 to 5·5 mm. long, in front of bursa 0·085 mm. thick. Bursa larger than in the other two species, antero-external rib thickest, antero-anterior and postero-median equally thick, straight. Spicule 0·16 to 0·17 mm. long, gubernaculum 0·085 to 0·095 mm. long. Female 5 to 6·5 mm. long, vulval opening 1·15 to 1·25 mm. distant from tip of tail, crescent shaped, oblique to body axis, and around it irregular thickenings. Ova 84 µ to 90 µ by 46 µ to 50 µ.