214 ILLINOIS BIOLOGICAL MONOGRAPHS [214 



OPHIOTAENIA LONNBERGII (Fuhrmann) 



[Figs. 119, 189] 



1895: Ichthyotaenia lonnbergii Fuhrmann 1895:218-226 



1909 : Proteocephalus lonnbergii La Rue 1909 :43 



1911 : Ophiotaenia lonnbergii La Rue 1911 :481 



Specific Diagnosis: Characters of the genus. Length as much as 

 17-19 cm. Breadth as much as 1.35 mm. Strobilation usually indis- 

 tinct. Intersegmental furrows shallow. Proglottids attached by full 

 width. Scolex globose, flattened dorsoventrally, 0.50-0.60 mm. in 

 breadth. No rostellum, no spines, no functional fifth sucker. Suckers 

 prominent, muscular, oval or round, deep, measuring 0.24-0.26 mm. 

 long by 0.14-0.22 mm. broad. Opening in oval suckers 0.20 by 0.10 

 mm. Neck 0.375-0.54 mm. in minimum breadth, length about 2.0 mm. 

 First proglottids about 0.5 mm. long by 0.50 mm. broad. Mature pro- 

 glottids quadrate, 0.85-1.0 mm. square or longer than broad, measuring 

 as much as 2.5 mm. long by 0.45-0.5 mm. broad. Ripe proglottids not 

 observed. Two pairs of main lateral excretory vessels situated at some 

 distance from lateral margins of strobila. Vessels spiral in form. 

 Transverse commissure present in posterior end of each proglottid. 

 Many branches extending from dorsal and ventral vessels to exterior. 

 In head many branches of anastomosing vessels. 



Genital pore marginal, irregularly alternating, situated at end of 

 first one-third or two-fifths of proglottid. Testes 90-160 in number, 

 round or oval, 0.05-0.08-0.12 mm. in maximum dimension, situated in 

 two lateral fields extending laterad of excretory vessels. Midzone of 

 proglottid not entirely free of testes. Vas deferens forming a large 

 mass of coils posterior to cirrus-pouch. Cirrus-pouch 0.185-0.280 mm. 

 long by 0.05-0.085-0.10 mm. broad. Ductus ejaculatorius in several 

 coils, frequently forming a small vesicula. Cirrus not muscular, when 

 protruded cylindrical and 0.13-0.15 mm. long by 0.045-0.05 mm. thick. 

 Vagina anterior or posterior to cirrus-pouch. Vaginal opening some- 

 times dorsal to latter, but vagina never crossing cirrus-pouch. A large 

 dilatation in vagina of some proglottids. Sphincter vaginae and recep- 

 taculum seminis present. Ovary thin, flat, lobes wedge-shaped or alate. 

 Organs of interovarial space typical of genus. Vitellaria sparse. Uterus 

 in past mature proglottids possessing 25-40 lateral pouches. Eggs im- 

 mature in specimens observed. Yolk-mass 0.010-0.012 mm. in diameter. 

 Egg membranes not seen. Embryos not yet developed. 



Habitat: In intestine of Necturus maculosus Rar Fuhrmann 

 does not state the locality of the host from which his type specimens 



