NO. 14 MANTER: DIGENETICTREMATODES OF FISHES 413 



Family Heterophyidae Odhner, 1914 



Paracryptogonimus americanus, new species 

 (Plate 45, figs. 98-100) 



Hosts and Localities : Liitinnus novemfasciatiis (Gill) or cya- 



jiopterus (Cuv. and Val.) 

 Tangola Tangola, Mexico 



Lutianus jordani (Gilbert) ? 

 Secas Islands, Panama 



Location : Ceca and intestine 



Numbers : Large number collected, especially from the former 

 host and locality 



SPECIFIC DIAGNOSIS OF PARACRYPTOGONIMUS AMERICANUS 



Body thick and plump with thick, somewhat wrinkled cuticula cov- 

 ered with fine spines ; spines easily lost in posterior region of body ; ante- 

 rior end broadly rounded; posterior half of body tapering slightly and 

 bluntly rounded. Most specimens 2.308 to 2.376 long by 1.147 to 1.555 

 in greatest width (anterior to midbody), but one mature specimen only 

 0.985 by 0.690. Oral sucker subterminal, almost circular, 0.300 to 0.307 

 in diameter (0.144 in the 0.985 specimen) ; single row of 52 to 57 oral 

 spines. Preoral cavity present (fig. 99), formed by body surface enclosing 

 oral sucker; oral spines covered by this circular fold. Oral spines about 

 26 fx long, tapering but not sharply pointed, sometimes slightly forked at 

 base. Acetabulum 0.187 to 0.225 in diameter (about % diameter of oral 

 sucker), deeply embedded in body, with transverse aperture. Forebody 

 short, vaiying with contraction, usually about 0.540 but sometimes as 

 short as 0.300 or practically the diameter of the oral sucker; with many 

 gland cells. 



Genital pore median near aperture of acetabular cavity at anterior 

 edge of acetabulum, a short distance posterior to intestinal bifurcation. 

 Pseudosucker lacking. 



Prepharynx present (fig. 99) but evident only in sections; pharynx 

 partly dorsal to oral sucker, slightly wider than long (0.120 to 0.142 in 

 length by 0.150 to 0.165 in width) ; esophagus apparently lacking; ceca 

 large, diverging laterally to bow backward, extending in sides of body to 

 near posterior end. 



Testes 2, ovoid, slightly wider than long, smooth, symmetrical, far 

 apart near lateral edges of body, ventral to ceca, separated by uterus, 

 at about midbody level. Seminal vesicle an elongated, irregularly lobed 



