'Plccnaria oooulta Kenk, 1969 



24 



25 



0.5 mm 



m vd vs 



am gp 



Fig. 25 after Kenk (1969). 



A small, white planarian up to 9 mm long and 1.5 mm wide. Head truncated, 

 with slightly convex frontal margin (which, in the gliding animal, may 

 present an indication of a bulge in the center). Eyes two, their distance 

 from each other amounting to 1/4 the width of the head, each eye farther 

 removed from the frontal than from the lateral margin. Externally very 

 similar to the eastern Phagoaata morgani and the western P. oregonensis. 

 However, in P. oaautta the tip of the anterior intestinal ramus extends 

 between the two eyes whereas in the adult P. morgani and P. oregonensis 

 its anterior tip is behind the eye level. Testes predominantly ventral, 

 stopping posteriorly at the level of the mouth. Penis with medium large 

 bulb and elongated conical papilla. Vasa deferentia opening independ- 

 ently into a glandular seminal vesicle. The highly convoluted ejaculatory 

 duct ends at the tip of the penial papilla and appears to be capable of 

 eversion. The common oviduct and, behind it, the stalk of the copulatory 

 bursa connect with the genital atrium close to the genital aperture. 

 Posterior to the aperture, the atrium extends into a small compartment 

 which receives the opening of the adenodactyl. This is a hollow organ 

 with a thick and dense muscle shell. The most outstanding characteristics 

 of the species are the structure of the penis and the presence of the 

 adenodactyl. So far found only in a well in the western part of Virginia. 

 Literature: Kenk (1969). 



30 



