CATFISH GENUS NOTURUS RAFINESQUE 



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TABLE 16. -Comparison of the hybrid (VMMZ 137904), Noturus exilis X 

 Noturus miurus, from the Poteau River, Oklahoma, with three species 

 of Noturus— Continued 

 [The data are from eastern Oklahoma specimens as follows: Noturus miurus, 

 counts from 12, Poteau River, UMMZ 137902 and measurements from 11, Illi- 

 nois and Poteau Rivers, UMMZ 137864 and 137902; Noturus exilis, measure- 

 ments from 20 and counts from 32, Illinois River, UMMZ 137863; Noturus noc- 

 tumus, counts and measurements from 12, Poteau River, UMMZ 137903- Ranges 

 of variation are followed by means in parentheses. Proportional measurements 

 are stepped. Data from both elements of paired structures are included.] 



C har acter 



exilis 



nocturnus 



Standard length (mm.) 



Caudal rays: 

 Total 



Upper simple 

 Total branched 

 Lower simple 



Soft pectoral rays 



Internasal pores 

 Preoperculomandibular pores 



Posterior serrae of pectoral 

 spine 



Lower jaw 



Pigmentation of lower jaw 



Black or darkened borders of 

 fins 



He£id length in standard length 



In pre dorsal length: 

 Dorsal spine length 

 Pectoral spine length 



In distance dorsal origin to 

 adipose notch: 



Predorsal length 



Head length 



Caudal peduncle depth 



Distance adipose notch to 

 caudal fin tip 



43.1 to 58.5 (50.0) 44.0to81.2 (62.9) 



46 to 51 (48.8) 



15 to 19 (17.0) 



16 to 21 (18.2) 

 11 to 16 (13.6) 



8 or 9 , normally 9 

 (8.5) 



1(1.0) 



9 to 11, usually 10 

 (10.0) 



Usually regular; 5 

 to 10 (6.9) 



Terminal 

 Never heavy 



Usually prominent 

 3.8 to 4.4 (4.0) 



3.3 to 4.8 (4.1) 

 2.6 to 3.6 (3.0) 



56 to 62 (58.3) 

 20 to 25 (22.3) 

 19 or 20 (19.4) 

 15 to 18 (16.6) 



9 or 10, usually 9 

 (9.1) 



2 (2.0) 



10 or 11, usually 11 

 (10.9) 



Not distinct or uni- 

 formly developed 



Included 



Heavy 



Usually indistinct 

 3.3 to 3.8 (3.5) 



3.3 to 5.1 (4.2) 

 2.6 to 3.8 (3.3) 



