80 



Fig.43: Lateral view of ptero- 

 sphenoid of (A) Phoxinus 

 cumberlandensis (KU 18934, 

 52.0 mm SL) and (B) P. pho- 

 xinus (CNUC uncat., 76.0 



A B mm TL). Scale bar = 1 mm. 



stefior portion of the bone bears a process in P. oreas, issykkulensis, tennesseensis, eos, 

 neogaeus, brachyurus, phoxinus, and in the outgroups (TS 65 [0]), although the process is 

 absent in P. cumberlandensis and erythrogaster (TS 65[1]). 



The pterosphenoid's ventroposterior margin sutures with anterior edge of the parasphe- 

 noid's ascending wing (Fig.42A-D). Variation in Phoxinus is present in the extent of the 

 suture between the pterosphenoid and the ascending wing of the parasphenoid. In P. neo- 



Fig.44: Dorsal view of ptero- 

 tic, parietal, epioccipital, and 

 supraoccipital (A) Phoxinus 

 tennesseensis (UT 44.5274, 

 50.0 mm SL) and (B) P. 

 brachyurus (MCZ 3006, 75.9 



B mm SL). Scale bars = 1 mm 



