Hymanella retenuova Castle, 1941 



26 



27 



Fig. 27 after Hyman (1955), 



Mature animals 7-14 mm long and 1.3-2.5 mm wide. Head of gliding animal 

 truncate with bulging frontal margin, at times appearing low triangular. 

 Lateral corners of head rounded, no distinct necklike constriction behind 

 them. Eyes two, farther removed from front end than from lateral margins. 

 Pigmentation grayish or brown. In life not distinguishable from pigmented 

 species of Phagoaata or Planaria. Testes not well analyzed, possibly 

 dorsolateral and prepharyngeal (or ventral and longitudinally fused?). 

 Vasa deferentia behind the spermiductal vesicles ascend to the penis and 

 unite. Penis very small, without bulb, consisting of a small papilla 

 traversed by the ejaculatory duct formed by the union of the sperm ducts. 

 Genital atrium very large, represented only by the male atrium which at 

 its posterior end receives the opening of the common oviduct from the 

 dorsal side. Copulatory bursa of varying size, its duct rather narrow, 

 running above the atrium and posteriorly arching down to the gonopore. 

 No separate vagina is differentiated. Cocoon ellipsoidal, unstalked, is 

 carried in the atrium up to four weeks before being deposited. In vernal 

 pools and seepage springs, apparently widely distributed in the east of 

 North America, from Massachusetts to North Carolina and Louisiana and 

 west to Ontario. Principal literature: Castle (1941), Hyman (1955). 



31 



