396 



FRESH-WATER BIOLOGY 



102 (101) Genital pore posterior to fork of intestine. . Acrolichanus Ward. 



(Syn. Acrodactyla Stafford 1904 preocc.) 



Body uniform in width or slightly constricted behind oral sucker which is 

 noticeably larger (0.325 mm.) than the acetabulum (0.275 mm.) located 

 about at center of body. Ovary posterior and close to acetabulum, slightly 

 lateral. Vitellaria from pharynx to posterior end. Uterus tubular, short, 

 with few eggs. Genital pore midway from acetabulum to oral sucker. 

 Cirrus large, with broad lumen at anterior end. Cirrus sac reaching to 

 posterior border of acetabulum or even a little beyond. Testes spherical, 

 close together, median, or slightly oblique, halfway from acetabulum to pos- 

 terior end. 



Representative American species. 



Acrolichanus petalosa (Lander) 1902. 



One species, A . petalosa (Lander), is common in intestine of Lake sturgeon 

 (Acipenser rubicundtts) in the Great Lakes and St. Lawrence River. 



"This is the D. auriculatum Wedl of Linton and it is upon the authority of 

 Looss that I use the above specific demonstration " (Stafford). The comment 

 of Odhner that Acr. petalosa is a synonym of Act, lintoni appears to be in- 

 correct. 



FIG. 685. Acrolichanus petalosa; type specimen. X 39. (Unpublished drawing 

 by C. H. Lander.) 



103 (98) Uterus ventral to both testes, extending nearly to extreme posterior 

 end Subfamily BUNODERINAE Looss 1902. 



Small distomes, with elongate body, and smooth skin. Anterior 

 region small, muscles moderately developed. Oral sucker with circle 

 of six muscular mammiform processes, often a collar-like expansion. 

 Acetabulum equal to or larger than oral sucker. Pharynx and 

 esophagus present, crura long. Genital pore between ventral and 

 oral suckers. Ovary close behind acetabulum and lateral. Testes 

 oblique, in posterior half of body. Uterus with descending and 

 ascending rami in sacculate form, ventral to testes in posterior 

 region. Laurer's canal and receptaculum seminis present. Vitellaria 

 lateral, well developed, extending from pharynx to caudal end. Eggs 

 large. 



Type genus Bunodera Railliet 1896. 



Esophagus long, forebody narrow. Fork of intestine somewhat 

 anterior to acetabulum. Cirrus sac without muscular tissue in wall. 

 Testes oblique, far back in body. Vitellaria not confluent, not 

 reaching posterior end. Uterus with descending and ascending 

 rami, greatly enlarged, not coiled, extending to posterior end and 

 covering testes on ventral side of body. 



Recorded in North America. 



Bunodera luciopercae (O. F. Miiller) 1776. 



One species B. luciopercae (O. F. Miiller) ( = Dist. nodulosum 

 Zeder) reported by Stafford from perch. 



FIG. 686. Bunodera luciopercae. Dorsal view. X 47- (After Looss.) 



