. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 155 Morphology.—Contraeaecum (p. 146) : Lips (fig. 220a) with ear- like projections and with 2 papillae; dentigerous ridges absent. Ac- cording to Drasche, intcrlabia about 2/3 the height of the lips, thick and curved, their free ends being close to lips; Skrjabin states that no interlabia are present. Cross-striations of cuticle give dentate appearance to collar as seen at edge of body. Male 13 to 18 mm. long by COO to 900/* wide. Esophagus mm. long, its appendix small, dactyliform (fig. 225). Intestinal cec
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 155 Morphology.—Contraeaecum (p. 146) : Lips (fig. 220a) with ear- like projections and with 2 papillae; dentigerous ridges absent. Ac- cording to Drasche, intcrlabia about 2/3 the height of the lips, thick and curved, their free ends being close to lips; Skrjabin states that no interlabia are present. Cross-striations of cuticle give dentate appearance to collar as seen at edge of body. Male 13 to 18 mm. long by COO to 900/* wide. Esophagus mm. long, its appendix small, dactyliform (fig. 225). Intestinal cecum 7/8 the length of esophagus. Tail (fig. 2206) 150/* long in 18 mm. specimen, with 10 pairs of large conical postanal papillae, with sometimes an additional asymmetrical papilla on one side. Preanal papillae in two rows of 31 to 50 papillae each, the number being not always the same in both rows. Spicules mm. long, alate. Female 18 to mm. long by 500/* to 1 mm. wide. Posteriorly directed esophageal appendix 1/3 the length of the anteriorlv directed. 226 Figs. 225-226.—Oontracakcum multipapillatcm. 225, Digestive organs ov male. After Skrjabin, 191(5. 22G, «, Head; b, male tail. After Drasche, 1882 intestinal cecum, the latter being 3/4 the length of the esophagus. Tail pointed, anus 370/* from end. Vulva in posterior part of body, dividing body length in ratio of 2:1. Eggs oval, 68/* long by 60/* wide. Life history.—Unknown. Distribution.—South America (Brazil and Paraguay). CONTRACAECUM OVALE (Linstow, 1907) Baylie, 1920b Synonym.—Ascaris oralis Linstow, 1907. Host.—Podiceps cristatus. Location.—Proventriculus and intestine. Morpholoyy.—Contraeaecum (p. 146) : Cuticle with cross-striations. Lips oval (fig. 227), wider than long, papillae projecting laterally. Dentigerous ridges absent. Pulp in 2 anteriorly directed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
Size: 2336px × 1070px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
