408 



THE ANIMAL PARASITES OF MAN 



Setaria equina, Abildg., 1789. 



Syn. : Gordius equinus, Abildg., 1789; Filaria equi, Gmelin, 1789; Hamularia 

 lymphatica, Treutler, 1793 > Tentacularia subcompressa, Zedder, 1800 ; Filaria 

 papillosa, Rucl., 1802; Filaria hominis bronchialis, Rud., 1819; Filaria hominis, 

 Dies., 1851 ; Strongylus bronchialis, Cobb., 1879. 



The body is whitish, filiform, pointed posteriorly. The cuticle 

 presents a delicate transverse striation. The mouth is small, round, 

 and surrounded by a chitinous ring, the border of which carries, at the 

 sides, two semilunar lips, and there is on the dorsal as well as on the 



ventral surface a papilliform process ; on the 

 tail, corresponding with each sub-median 

 line, is a conical papilla. The male mea- 

 sures 6 to 8 cm. in length ; the posterior 

 extremity ends in a corkscrew spiral ; there 

 are on each side four pairs of pre-anal and 

 four or five post-anal papillae ; the spicules 

 are unequal. The female measures 9 to 

 12 cm. in length and is viviparous ; the 

 embryos measure 0-28 mm. in length and 

 0*007 mm - m breadth. 



FIG. 288. Setaria 

 equina : left, male ; 

 right, female. Natural 

 size. (After Railliet. 



FIG. 289. Setaria equina : anterior end, magnified. 

 (After Railliet.) 



Setaria equina is a frequent parasite of horses and asses ; it inhabits the 

 peritoneal cavity, and from there occasionally invades the female genitalia or even 

 the liver; it is found more rarely in the pleural cavity or in the cranium. The 

 statement that it also occurs in the subcutaneous connective tissue is probably due 

 to confusion with Setaria (Filaria) h&morrhagica, Raill., 1885 (Filaria multi- 

 papillosa, Cond. et Drouilly, 1878). Setaria labiata papillosa (immature form) 

 occurs in the eye of the horse, adults in the peritoneal cavity. 



Treutler, in 1790, found a filaria in the enlarged bronchial lymphatic 

 gland of a patient suffering from phthisis. It measured 26 mm. in 



