134 



Fig. 86: Dorsal view of pecto- 

 ral radials of Phoxinus phoxi- 



nus (CNUC uncat., 76.0 mm 

 TL). Scale bars = 1 mm. 



teral side of the bone. The two facets articulate with the first pectoral ray and are far away 

 from one another. In P. eos. the medial facet is very high and forms a process (TS 196[ 1]). 

 The facet is much lower in other species of Phoxinus and in the outgroups (TS 196[0]). 

 Radial 2 (Figs. 86. 87A-F) bears a trough at its lateral side to articulate with the medial 

 side of radial 1 . The bone is triangular in P. cumberlandensis, erythro gaster, phoxinus. and 

 oreas (TS 1 97 [ 1 ] ) : it is narrow and slender in other species of Phoxinus and in the out- 

 groups (TS 197[0]). A process is present at the medial margin of radial 2 in P. eos (TS 

 1 98 [ 1 ] ); the process is absent in other species of Phoxinus and in the outgroups (TS 

 198[0]). 



Radial 3 (Figs. 86. 87A-F) is an elongate bone bearing a trough at the lateral side articu- 

 lating with the medial of radial 2. A process is present at its anteromedial side in P. cum- 

 berlandensis (TS 199[ 1 ] ); the process is absent in other species and in the outgroups (TS 

 199[0]). 



Radial 4 (Figs. 86. 87A-F) is an elongated bone and does not bear variation with phylo- 

 genetic significance in Phoxinus. 



In Phoxinus. 13 to 18 pectoral fin-rays are present with intraspecific variation. See Spe- 

 cies Accounts for discussion on variation in the numbers of the pectoral rays for each spe- 

 cies. The pectoral rays increase in number with age (Hill & Jenssen 1968). All rays, except 

 the first one. do not bear variation with phylogenetic significance in Phoxinus. 



