NEMATODE PARASITES OF BIRDS 



371 



Male 28 to 35 mm. long; maximum width 630 to 800/*, width at an- 

 terior end of body 168 to 190^., at posterior end (just anterior to 

 bursal cup) 370 to 480/u.. Esophagus 7.3 to about 12 mm. long. 

 Bursal cup 480 to 560/x long by 560 to 700/i. wide, trumpet-shaped 

 (fig. 430 b and c) with a distinct, fairly deep incision on the ventral 

 side. 



Female evidently imperfect; length not given. Maximum width 

 1.2 mm., width at head end 240^; esophagus 12 mm. long. 



Life history. — Unknown ; see E. tubifex, p. 367. 



Distribution. — Europe (Austria (Museum, Vienna)) and Asia 

 ( Russian Turkestan ) . 



Fig. 431. — Eustrongylides ignc-tus. a, Head; b, female tail; c and d, male 



TAIL; e AND f, EGG. AFTER JAEGERSKIOLD, 1909 

 EUSTRONGYLIDES IGNOTUS Jaegerskiold. 1909 



Synonyms. — Filana cystica Rudolphi, 1819; Agamonema cysticuni 

 (Rudolphi, 1819) Diesing, 1851; Eustrongylus papillosus Diesing, 

 1851, part; Hystrichis papillosus Molin, 1861, part; Eustrongylus 

 tubifex Schneider, 1866, part; Spiroptera bicolor Linstow, 1899. 



Hosts. — Primary: fAnMnga anhinga, Ardea cocoi, A. herodias, 

 liotaurus pinnatus; secondary : Fish ; larvae in Symbranchus laticau- 

 datus and Galaxias scriba resemble this species, according to Jae- 

 gerskiold, and Chapin has found the preadult stage of this species 

 in Fundulus diaphanus. 



Location. — In fat around gizzard of primary host, in body cavity 

 of secondary host. 



Morphology. — Eustrongylides (p. 367) : Body equally thick 

 throughout. Head (fig. 431«) witli 12 papillae in 2 circles, those 

 of the inner circle being larger and more conspicuous than those of 

 the outer circle, which are low and wart-like. Mouth opening hexag- 

 onal. Mouth cavity 100 to 160/a long. 



Male 36 mm. long; maximum width 1 to 1.4 mm., width at head 

 end 250^, at tail end (just anterior to bursal cup) 350 to 460/*. 



