FAMILY CATOSTOMIDAE 



135 



The greater redhorse ranges from Minnesota through the lower Great 

 Lakes drainage to New York and southward to the Ohio River. This 

 species is present in the larger streams of the Mississippi drainage in 

 both Minnesota and Wisconsin. Greene (1935) found it also in Wis- 

 consin tributaries of Lake Michigan. 



GOLDEN REDHORSE 



Moxostoma erythrurum (Rafinesque) 



This species is similar to M. ruhreques, but smaller. The halves of the 

 lower lip meet at a rather sharp angle. The eye is more than one-fourth 

 the length of the head in young and more than one-seventh the length 

 of the head in adults. The scales number 38-44. 



The golden redhorse ranges from southern Minnesota eastward to 

 southern Ontario and southward to northern Alabama and the Red 

 River basin in Oklahoma. It is found in small tributaries of the Missis- 

 sippi and also in the St. Croix, Minnesota, and Mississippi rivers. It 

 was collected from the Root River by the Minnesota Department of 

 Conservation in 1945. Greene (1935) reported this species from many 

 streams of Wisconsin, exclusive of the Lake Superior drainage. 



SILVER REDHORSE (Whitenose Sucker, Silver Mullet) 

 Moxostoma anisurum (Rafinesque) 



The silver redhorse (Figure 20) is pale in color; the caudal fin is 

 smoky gray, with the upper lobe narrower and longer than the lower; 



Figure 20. Silver redhorse, Moxostoma anisurum, 19 inches long. 



the lower fins are red in the spawning season. It is distinguished by a 

 large dorsal fin, which has 14 to 17 developed rays. The eye is large, 

 more than one-fourth the length of the head in young and more than 

 one-seventh the length of the head in adults. The scales number 38-44, 



