. Bulletin - United States National Museum. Science. 66 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Male 15 mm. long by 550//, maximum width. Esophagus, including bulb, mm. long; esophagus 79/*, wide; bulb 370/* long by 210/* wide. Preanal sucker 950/*. from tail end and measuring 140//, in diameter, its posterior edge interrupted by a depression. Caudal alae (fig. 88) originating just anterior to sucker and extending almost to tail end. Cloacal aperture 640/*, from tail end. Twelve pairs of caudal papillae, their position and relative size identical with those of Heterakis isolonche: 2 pa
. Bulletin - United States National Museum. Science. 66 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Male 15 mm. long by 550//, maximum width. Esophagus, including bulb, mm. long; esophagus 79/*, wide; bulb 370/* long by 210/* wide. Preanal sucker 950/*. from tail end and measuring 140//, in diameter, its posterior edge interrupted by a depression. Caudal alae (fig. 88) originating just anterior to sucker and extending almost to tail end. Cloacal aperture 640/*, from tail end. Twelve pairs of caudal papillae, their position and relative size identical with those of Heterakis isolonche: 2 pairs at the level of the sucker, 6 pairs adanal, and 4 pairs postanal. Two spicules of almost equal length, mm. (the left spicule a few microns longer than the right spicule) ; the width of the left spicule is 76/*, that of the right spicule 49/*. If extruded, the spicules cross each other, a condition which is seen in H. isolonche also, as figured by Lucet and Henry. Female 17 mm. long by 600/*, maximum width. Total esophagus mm. long. Anus mm. from tail end. Vulva 8 mm. from head end; 2 prevulvar and 2 to 3 postvulvar papillae. Vagina very long. Eggs 65 to 67/* by 35 to 40/*.. Figs. 87-88.—87, Heterakis isolonche. Male tail. After Linstow, 1006. 88, Heterakis neoplastica. Male tail. After Wassink, 1917 Life history.—Probably similar to that of H. gallinae (p. 54). Distribution.—Europe (Holland (Amsterdam)). This species is very close to H. -isolonche, but because of certain morphological differences (size of worms, length of tail of both male and female), and because of an apparent difference in pathogenicity of the two nematodes, the present writer prefers to regard them as distinct species at the present time. Spindle-cell sarcoma of the pheasants listed above is attributed by Wassink to H. neoplastica, whereas the nodular growths caused by H. isolonche have not been shown to be of that nature. Since the above was written, Baylis (1925) has examined TVas- s
Size: 3365px × 743px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
