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Lyons, John (John D.); Cochran, Philip Andrew; Fago, Don / Wisconsin fishes 2000: status and distribution

Species accounts,   pp. 15-[68] PDF (2.0 MB)

Page 16

Wisconsin Fishes 2000 
Figure 2. Map of the distribution of southern brook lamprey 
in Wisconsin. 
Description: The southern brook lamprey, a 
nonparasitic species, is thought to be an evolu- 
tionary derivative of the parasitic chestnut lam- 
prey (Ichthyomyzon castaneus) (Hubbs and 
Trautman 1937). Both possess a single dorsal fin 
more or less divided by a shallow notch into two 
lobes, and they have a similar number of trunk 
myomeres. Extreme counts of 48 and 59 trunk 
myomeres have been reported for southern 
brook lampreys by Hall and Moore (1954) and 
Dendy and Scott (1953), but the range of 52-56 
reported by Page and Burr (1991) is more typi- 
cal. In addition, both species typically possess at 
least some circumoral teeth that are bicuspid. 
For example, among 100 southern brook lam- 
preys from throughout the southeastern United 
States, Dendy and Scott (1953) found the num- 
ber of bicuspid circumoral teeth to range from 
0 to 10, with a mean of 5.5. Unlike the chestnut 
lamprey, the southern brook lamprey has an oral 
disc narrower than its head, and it does not 
achieve a maximum length greater than approx- 
imately 160 mm. The southern brook lamprey 
can be distinguished from the northern brook 
lamprey (Ichthyomyzon fossor) most easily by its 
bicuspid circumoral teeth. In addition, its teeth 
are generally more strongly developed than the 
short, blunt teeth of the northern brook lam- 
prey. Large ammocoetes of the two species can 
be distinguished by their lateral line pores; those 
of the southern brook lamprey are much darker 
than their background. 
Southern brook lampreys from Wisconsin and 
Minnesota appear similar to those from the 
southern United States (color plate 1) (Cochran 
1987, Lyons et al. 1997). However, spawning 

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