9550

• UCREFRP Catalog Number: 9550
• Author: Snyder, D. E. and R. T. Muth.
• Title: Catostomid Fish Larvae and Early Juveniles of the Upper Colorado River Basin - Morphological Descriptions, Comparisons, and Computer-interactive Key.
• USFW Year: 2004.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

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Fig. 47. Intemeurals of Catostomus commersoni. Top
- postflexion mesolarva, 14.7 mm SL, 17.0 mm TL.
Middle - juvenile, 20.4 mm SL, 25.0 mm TL. Bottom-
juvenile, 42.6 mm SL, 52.5 mm TL.

Fig. 48. Frontoparietal fontanelle of Catostomus
commersoni. Top- juvenile, 28.0 mm SL, 34.8 mm TL.
Bottom - juvenile, 39.8 mm SL, 49.0 mm TL.

Table 15. Dimensions of frontoparietal fontanelle for
Catostomus commersoni larvae > 16 mm SL, early
juveniles, and yearling.

Specimens Max. width
mm SL n (mm)

17-19 2 0.8-1.0
20-21 2 0.6-0.8
22-25 1 0.8
26-34 2 0.8-0.8
35-46 1 0.9
76-81 1 0.8

Max. length
(mm)

2.0-2.2
1.9-2.1
2.0
2.3-2.6
3.0
3.1

Width as %
oflength

40-45
32-38.
40
- 31-35
30
26

)f

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