260 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



RUSGUNIELLA VANELLI (Rudolphi, 1819) Seurat, 1919a 



Synonyms. — Spiroptera vanelli Rudolphi, 1819; Acuaria vanelli 

 (Rudolphi, 1819) Poche, 1912. 



Hosts. — Primary : Trvngae vanelli, Vanellus cristatus; secondary : 

 Unknown. 



Location. — Intestine and between tunics of gizzard. 



Morphology. — Rusguniella (p. 258) : Cuticula with fine transverse 

 striations indicated by rows of glittering granules. Mouth with 2 

 lips with 2 blunt teeth (or projections?) and with pedunculated 

 papillae. The crescent-shaped cordons (fig. 323) or epaulets 

 originate at the teeth. Precervical papillae immediately posterior 

 to cordons and directed anteriorly. 



Male unknown. 



Female 4 to 6 mm. long, according to Diesing (Linstow's speci- 

 men 5.3 mm.), by 200^ wide. Esophagus 10/68, tail 1/34 of total 



Figs. 322-323. — 322, Rusguniella elongata. Anterior end. a, Lateral view ; &,. 

 ventral view. After Seurat, 1919. 323, Rusguniella vanelli. Anterior end, 

 ventral view. After Linstow, 1884 



body length. Tail rounded. No lateral alae mentioned or figured. 



Life history. — Unknown; probably involves intermediate stages 

 in other hosts. 



Distribution. — Europe (Vienna Museum). 



Genus SCIADIOCARA Skrjabin, 1916b 



/Synonyms. — /Spiroptera Rudolphi, 1819, part; Schistorophus 

 Railliet, 1916, part. 



Generic diagnosis.— Acuariinae (p. 211) : Head with 2 small lat- 

 eral papillae and 4 submedian papillae. Posterior to the lips there 

 are 4 peculiar, delicate, hemispherical alae (the "Laeppchen" of 

 Drasche), which are arranged in pairs on each side. Caudal ex- 

 tremity of male twisted in spiral and provided with alae and with 

 6 pairs of preanal and several pairs of postanal papillae. Spicules 

 unequal, the smaller provided with a canal through which the larger 



