77 



Fig.41: Lateral view of infraorbital bones of Phoxinus. A: P. brachyurus (MCZ 3006, 75.9 mm SL); 

 B: P. cumberlandensis (KU 18934. 52.0 mm SL): C: P. issykkulensis (P- 10696. 42.4 mm SL): D: P. 

 erythrogaster (KU 5773. 62.0 mm SL); E: P. phoxinus (CNUC uncat.. 76.0 mm TL); F: P. tennes- 

 seensis (UT 44.5274; 50.0 mm SL): G: P. oreas (KU 3259. 52.2 mm SL); H: P. neogaeus (KU 8521. 

 53.o mm SL). Scale bars = 1 mm. 



much from its anterior portion to its posterior portion (TS 57[0]; Fig.41B). The posterior 

 portion of the former is much broader than the anterior portion in P. oreas, phoxinus, tenn- 

 esseensis, brachyurus, and eos (TS 57[1]; Fig.41E). In P. tennesseensis the anterior mar- 

 gin of infraorbital 3 is far from infraorbital 2 (TS 58[1]; Fig. 4 IF); the anterior margin of 

 the former is close to the latter in other species of Phoxinus (TS 58[0]; Fig.41H). In the 

 outgroups, infraorbital 3 does not vary much in width along the length, and the anterior 

 margin of the bone is close to the infraorbital 2. 



