190 



Poff; 14 June 1962. - KU 7606. 1 C&S; Pigeon Creek. Sec. 7-8. T32N R7W, Dent Coun- 

 ty, Missouri, USA; F.B. Cross et aL; 7 April 1963. - KU 10629. 12 alch. and 2 C&S: 

 Possum Trot Creek. 3.25 mi. NE Dillard. T35N, R2W. SI 6. Crawford County. Missouri. 

 USA; W.L. Pflieger & S. Cliburn; 18 July 1963. - KU 12495. 3 C&S; North Fork Whi- 

 te River. Sec. 7. T27N, R11W. Douglas County, Missouri. USA: G.R. Smith et al.: 24 

 May 1967. - KU 12496, 5 C&S: North Fork White River. Sec. 7. T27N. R11W. Douglas 

 County, Missouri, USA; G.R. Smith et al; 24 May 1967. - KU 13198. 1 C&S: Deep Creek 

 at Rt 70 crossing. Wabanusee County. Kansas: R. Irwin: 7 June 1966. - KU 22092. 12 

 alch.: Tryon Grove Road. Sec. 20. T46N, R8E. McHenry County. Illinois. USA: O.T. Go- 

 rman & M.G. Meyer; 26 July 1986. - KU uncat.. about 70 alch. and 4 C&S: Barren Fork 

 of Illinois River at Camp Egan (near Proctor). Adair County, Oklahoma, USA; W. Mat- 

 thews & X. Chen; 27 April 1991. 



Diagnosis (amended from Rafmesque 1820a) 



A Phoxinus with two lateral stripes, the upper one interrupted on caudal peduncle: in- 

 testine elongate; pharyngeal teeth in one row: epural bone elongate. 



Description (Tab. 10) 



A North American Phoxinus species with average standard length (adults) about 60 mm, 

 maximum standard length up to 90 mm. Head large, broad, and robust, its length 25% 

 and its width 52% of standard length. Eye lateral on head, moderately large, orbit length 

 26% of head length. Snout moderately elongated, its length 27% of head length, 102% of 

 orbit length. Mouth small, slightly subterminal and oblique, its gape not extending to be- 

 low anterior margin of eye. Lower jaw slightly shorter than upper one. 

 Bony interorbital space wide, its width 122% of orbit length, 32% of head length. Ante- 

 rior nasal opening smaller and shorter than the elongated posterior one. Margin of ante- 

 rior nasal opening erect, except its anterior portion: margin of posterior nasal opening not 

 erect, except its anterior portion. 



Young individuals (18.0 mm standard length or less) with axis of olfactory organ short 

 and located at anterior margin of olfactory chamber, four primary lamellae present; larger 

 individual (46.0 mm standard length or larger) with axis elongate and extending posteri- 

 orly, 12 primary lamellae present. Numerous melanophores present on primary lamellae 

 in both young and adult specimens. 



Body elongate, stout, not strongly compressed, caudal peduncle more compressed than an- 

 terior part of the body. Maximum depth of body 21% of standard length. Caudal pedun- 

 cle length 24% of standard length, its depth 43% of its length. 



In male, genital papilla small, surface smooth without skin fold. In female, genital papil- 

 la larger than that in male, its surface bearing a few skin folds. Posterior margin of pa- 

 pilla close to anal fin origin in both male and female. 



Pectoral fin fan-like, sharper and smaller in female than in male. The distal tip of pecto- 

 ral fin never reaching pelvic fin origin; with 13-17 rays, most with 15 or 16 rays. Pelvic 

 fin originates in advance of dorsal fin origin, in anterior half of body, prepelvic fin length 



