360 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



MICROTETKAMERES SPIRALIS (Seurat, 1915) Travassos, 1915b 



Synonyms. — Tropidocerca spiralis Seurat, 1915a; Tetrameres 

 spiralis (Seurat, 1915) Travassos, 1915&. 



Hosts. — Primary : Bubulcus lucidus; secondary : UnknoAvn ; proba- 

 bly similar in a general way to that of T. fissispina (p. 343). 



Location. — Proventriculus. 



Morphology. — Microtetrameres (p. 351). 



Male 4.75 mm. long by 130/x wide. Body filiform, white. Buccal 

 capsule (fig. 423a) 30/t long. Pharynx narrow, its length 1/4 that 

 of the esophagus. Combined length of pharynx and esophagus 1/3 



&% 



Figs. 421-423.— 421, Microtetrameres minima. Male. After Travassos, 1014. 422, 

 Microtetrameres pusilla. Male. After Travassos, 1919. 423, Microtetrameres 

 spiralis. Head and tail of male. After Seurat, 1915 



that of body. Nerve ring encircles middle of pharynx. Cervical 

 papillae symmetrical, behind the nerve ring, 300^ from the anterior 

 extremity of the body. Excretory pore very small, 25ju in front of 

 the level of these papillae ; it is connected with a cuticular canal 50/i 

 long. Cloacal aperture (fig. 423 b) with 2 projecting lips, the lower 

 one more strongly developed. Four pairs of sessile genital papillae 

 near the cloacal aperture, 2 preanal and 2 postanal. Two spicules 

 of very different lengths, the right short (145/x) and curved, the left 

 2.3 mm. long, slender and filiform. 



Female 2.5 mm. long by 2 mm. wide. Body red color, rolled spirall}' 

 (3^2 times). No longitudinal furrows as are present in species of 

 Tetrameres. Cuticle transversely striated. Buccal capsule bottle- 

 shaped, 30/* long. Pharynx 175/* long. Intestine brown or black. 



