Phagoaata tahoena Kawakatsu, 1968 



Synonyms: Phagoaata nivea tahoena Kawalcatsu, 1968; Fontioola nivea tahoena- 

 Ball, 1969. 



39 



bd ode V i 



sv 



vd pi am pp gl 



Fig. 40 after Kawakatsu (1968) 



A rather plump and thick planarian reaching over 12 ram in length and about 

 2 mm in width (but may be sexually mature at half that size). Anterior 

 end rounded, frontal margin with a small median projection when the animal 

 is gliding. No neck constriction. Eyes two, at a distance from each 

 other of about 1/3 the width of the head or less. Dorsal side with a 

 brown pigment which fades out toward the lateral margins and leaves a 

 crescent-shaped area along the frontal margin white. Ventral surface 

 unpigmented, white. Testes predominantly ventral, extending from the 

 level of the ovaries to the posterior end. Penis with well-developed 

 bulb and conical or finger-shaped papilla. Penial lumen wide, traversing 

 the penis from the bulb to the tip of the papilla, not clearly differen- 

 tiated into seminal vesicle and ejaculatory duct. Sperm ducts open 

 separately into the anterior part of the penis lumen. Oviducts uniting 

 above the atrium and opening into its posterior section. Bursa and bursa 

 stalk lined with a very thick epithelium, the stalk running on the left 

 side of the penis and lacking a differentiated vagina. Known only from 

 Lake Tahoe, California and Nevada, at depths of 15 to 1632 feet (4.6 to 

 500m). Literature: Kawakatsu (1968), Kenk (1970a). 



38 



