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

Fig. 34. Frontoparietal fontanelle of Catostomus
catostomus. Top - metalarva, 22 mm SL, 26 mm TL
(head angled downward giving false impression that
fontanelle is more anterior than it should be). Bottom
- juvenile, 29 mm SL, 35 mm TL.

Table 10. Dimensions of frontoparietal fontanelle for
Catostomus catos tomus larvae> 16mm SL, early juveniles,
and yearling.

Specimens Max. width Max. length Width as %
mmSL n (mm) (mm) oflength
17-19 2 1.5-1.5 1.8-2.1 71-83
20-21 2 1.5-1.7 2.0-2.1 75-79
22-25 3 0.9-1.5 2.1-2.3 39-68
Fig.33. Interneurals of Catostomus catostomus. Top- 26- 34 3 1.1-1.4 2.7-3.0 40-47
postflexion mesolarva, 15.0 mm SL, 18.0 mm TL. 35-46 2 1.1-1.4 3.2-3.8 29-44
Middle - metalarva, 20.5 mm SL, 24.4 mm TL. Bottom 47-75 2 1.1-1.4 3.8-4.5 29-31
- juvenile, 41.0 mm SL, 49.0 mm TL (dashed line- 76-87 1 1.5 4.8 31
possible unstained portion).

~

43