103 



Several parts can be recognized in the urohyal, i.e., the ventral plate (= ventral spread of 

 Kusaka 1974), dorsal plate (= dorsal spread of Kusaka 1974), anterior fork, and neck 

 (Fig. 63 A). The thin ventral plate of the urohyal is located at the ventral portion of the 

 bone. The bar-shaped neck is at the anterior to the ventral plate. The neck's anterior end 

 is forked, forming the anterior fork of the urohyal. The anterior portion of the dorsal side 

 of the ventral plate bears a concavity. Dorsally, the dorsal plate is present which extends 



Fig.64: Lateral view of anterior and posterior ceratohyals, branchiostegals, and interhyal of Phoxi- 

 nus. A: P. oreas (KU 3259, 55.0 mm SL); B: P. phoxinus (KU 22858, 58.0 mm SL); C: P. eos (KU 

 12255, 43.0 mm SL); D: P. issykkulensis (P- 10696, 42.4 mm SL); E: P. cumberlandensis (KU 18934, 

 45.0 mm SL). Scale bars = 1 mm. 



