Diagnosis (amended from Cope 1862) 



A Phoxinus with small mouth, its gape not reaching below anterior margin of eye; two 

 lateral dark stripes present, the lower one more developed than the upper; no dark spots 

 on dorsal part of trunk; axis of olfactory organ long and narrow; nasal bone expanded, 

 triangular in shape; nasal portion of supraorbital canal running along lateral portion of na- 

 sal bone; hyoid foramen formed by ventral hypohyal alone; urohyal base bearing a pro- 

 cess at the posterior margin; basibranchial 4 present as a cartilage; interopercle with round 

 posterior margin. 



Description (Tab.9) 



A North American species of Phoxinus with average standard length about 50 mm (adults), 

 maximum 61 mm (Stasiak 1980a). Head moderately large, its length 27%, its width 55%, 

 and its depth 22% of standard length. Snout short; its length 24% of head length, 83% of 

 orbit length. Eye large, lateral on head; orbit length 30% of head length. Mouth terminal, 

 small and oblique. Lower jaw slightly shorter than upper one. 

 Bony interorbital space wide, its width 118% of orbit length, 35% of head length. 

 Young individual (26.4 mm standard length) with short and broad axis of olfactory organ, 

 the axis not reaching to middle of organ, seven primary lamellae present; adult individu- 



Tab.9: Body proportions (%) of Phoxinus eos. (ACGL: anterior chamber of gas bladder length; BD: 

 body depth; BIW: bony interorbital width; CPD: caudal peduncle depth; CPL: caudal peduncle length; 

 HD: head depth; HL: head length; HW: head width; IL: intestine length; Number: number of speci- 

 mens; OL: orbit length; PCGL: posterior chamber of gas bladder length; PRDL: predorsal fin length; 

 PRPL: prepelvic fin length; S: standard deviation; SL: standard length; SNL: snout length). 



HL/SL HD/SL BD/SL CPL/SL CPD/SL PRDL/SL PRPL/SL IL/SL HW/SL HD/HL 



Number 



16 



15 



15 



15 



16 



16 



16 



4 



16 



16 





25.1 



15.5 



18.2 



22.7 



8.2 



55.3 



47.4 



131.0 



11.4 



55.9 



Range 

























29.3 



19.6 



26.1 



27.9 



12.5 



61.1 



53.0 



14 0.2 



17.5 



67.6 



Mean 



26.7 



21.5 



16.4 



25.2 



10.6 



55.6 



51 .4 



134.8 



14.5 



61.8 



S(±) 



1.4 



1.1 



2.4 



1.8 



1.1 



5.7 



2.5 



4.4 



1.5 



5.4 



OL/HL HW/HL SNL/HL BIW/HL BIW/OL SNL/OL PRDL/ CPD/CPL ACGL/ 



PRPL PCGL 



Number 



16 



16 



16 



16 



16 



15 



15 



15 



4 





28.3 



43.4 



20.5 



30.8 



108.0 



72.0 



98.3 



3 6.5 



62.5 



Range 























35.6 



62.4 



27.6 



41.0 



146.7 



100.0 



1 19.1 



51.4 



68.3 



Mean 



29.8 



54.7 



23.8 



34.8 



118.3 



82.5 



1 11.2 



43.2 



65.1 



S(±) 



3.5 



6.9 



1.9 



3.2 



14.9 



9.9 



6.1 



5.1 



2.55 



