9492

• UCREFRP Catalog Number: 9492
• Author: Snyder, D. E.
• Title: Computer-Interactive Key to Sucker Larvae and Early Juveniles of the Upper Colorado River Basin with Description of Longnose Sucker.
• USFW Year: 2003.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

Table 5. Comparison of the more diagnostic melanophore pigmentation patterns for larvae and juveniles ($40 SL)
of Upper Colorado River Basin catostomids. Key to characters and their states is given below. Rare or questionable
data are enclosed in parentheses. NA = not applicable.
Character Catostomus Catostomus Catostomus Catostomus Catostomus Catostomus Xyrauchen
number ardens catostomus commersoni disco bolus latipinnis platyrhynchus texanus
Protolarvae (after pigment is well established)
I. 1-3 3-5 4-5 1-4 1-3 3-5 1-2
2. 1-2 1,(2-3) 1-2,(3) I I 1-2,(3) 1-2,(3)
5. I I I 1,(2) I I I
7. 1-2 (2),3 2-3 1-3 1-3 2-3 1-3
8. 1-2 1-2 2-3 1-2 2-3 1-2 2-3
Flexion Mesolarvae
I. 1-3,(4-5) 3-5 4-5 1-4 (1 ),2-3 (3),4-5 1-2
2. 1-2 1-3 1-3 1 1 1-3 1-3
3. 1-2 2 2 1-2 1-2 2 1-2
4. 1-2 (1),2 1-2 1-2 I 1-2 1-2
5. I I I 1-2 I 1,(2) I
7. 1-2 2-3 1-3 2-3 1-2 2-3 1-3
8. 2-3 (1),2 1-3 1-3 2-3 1-2 2-3
9. I I 1-2 I 1-2 I 1
10. 2 2 2 2 2 2 1-2
II. 1-2 1-2 1-2 1-3 1-2 I 1
12. 1-2 1-2 1-2 1-2 1 I I
13. 2-3 2-3 2-3 1-3 2-3 2-3 1-3
Postflexion Mesolarvae
1. (1),2,(3-5) 3-5 (4),5 ( 1-2),3-4 (I ),2-3 (2-4),5 1-2
2. 1-2,(3) 1-3 (1),2-3 1,(2) 1,(2-3) (I ),2-3 1-2,(3)
3. 2 2 2 (1),2 1-2 2 (1),2
5. 1-2 I 1-2 1-2 1-2 1-2 1,(2)
7. 1,(2) (I ),2,(3) (I ),2,(3) 1,(2-3) 1,(2) (1),2 1-2
8. 1-3 1-2,(3) 1,(2-3) 1-2 1-3 1,(2) 1-2,(3)
9. 1 I (1-2) I (1),2 (1) I
12. 1-2 1-3 1-3 1-2,(3) 1-2 1-3 1-2
13. (2),3 (2),3 3 2-3 2-3 2-3 (2),3
18. 1,(2) 1-2 2 1,(2) 1-2 (1),2 (1-2)
Metalarvae
I. (1),2,(3) (2),3-5 4-5 (1-2),3-4 (1),2,(3) (2),3-5 1,(2)
2. (1),2 1-2,(3) 1-3 1,(2) I 1-3 I
3. (1),2 2 2 1-2 1-2 (1),2 1,(2)
6. I 1-2 I 1,(2) I I I
II. 3 (1-2),3 3 3 (2),3 3 (l ),2-3
12. (2),3 1-3 (1-2),3 3 (I ),2-3 (1-2),3 1-2
19. I I 1,(2) I 1,(2) I (1),2
20. 1-2,(3) 1-3 1-2,(3) 1-2 1,(2-3) 1,(2) (1),2
21. (I ),2-3 1-3 1-2,(3) 1-2,(3) 1,(2) (I ),2-3 1,(2)
22. I I I I I I 1-2
Juveniles
1. 1-2,(3) 1-3,(4),5 (1-2),3-5 1-3 1-2,(3) 1,(2),3,(4-5) 1-2
2. 1,(2) 1,(2) 1-2,(3) I I 1,(2) 1,(2)
14. 3 3 (2),3 3 2-3 2-3 1-3
15. 2-3 1-2,(3) 1-2,(3) 1-2 1-2 (1),2-3 1-2,(3)
16. 1,(3) 1-2 1,(2),4 I I I I
17. 1,(2) 1-2 1-2 I I 1,(2) 1
19. 1-2 1-2 1-2 I (1),2 1-2 2
20. 1-2,(3) 1-3 1-2,(3) (1),2 1,(2-3) 1-2 1-2,(3)
22. 1-2 1,(2) 1,(2) 1 1-2 I (1),2
Key to pilmlent characters and states:
1. Ventral midline from shortly behind heart region to near vent
1. without melanophore pigment.
2. with 1-6 melanophores.
3. with 7-20 melanophores.
4. with ~21 melanophores in a short or distinctly discontinuous line.
5. with ~21 melanophores in a continuous or nearly continuous, full-length line or narrow band.
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