7345

• UCREFRP Catalog Number: 7345
• Author: Wick, E. J.
• USFW Year: 1975.
• Copyright Material: NO

-8-
TABLE' 1. Comparison of Gila r.' robu^ta, G. elerans and r.. rypr :a for
19 cha.racterirst.ics (porportional meaniarements ex^ressed in thonsand the
of standard length, based on 130 robust.a, 99 elegans and 1.6 cypha).
The characteristics of specimen found. are in right-hand column.
G.r. robust.a G. elegans G. cyPha _ Snc?cimen
Character Range Mean Range Mean Range Mean Standard Length
285 mm.
Dorsal fin rays
Anal fin rays
Gill rakers
Vertebrae
Predorsal length
Anal origin-
caudal base
Head depth
Snout length
Interorbital width
Upper jaw length
Dorsal fin base
length
Least depth of
peduncle
Squaination
Nuchal hump
Fleshy snout
Eye diameter
8-9 9.0 9-11 1.0.1 9-10 9.5 10
7-10 9.1 9-12 10.1 10-11 10.1 11
20-28 23.8 23-36 29.8 22-28 25.6 26
41-44 42.2 42-47 44.8 42-A5 43.3
491-569 523.6 451-498 477.1 464-508 487.6 498.2
317-398 352.1 371-443 409.5 398-468 417.4 424.6
86-123 101.8 59-88 74.1 68-92 79.9 80.7
76-102 88.6 59-85 69.3 77-100 88.8 71.9
74-114 R6.7 67-90 76.6 81-94 8A.5 8`:0
83-117 96.4 - 56-84 68.4 74-89 82. r, 80.7
111-145 125.6 126-168 139,0 132-162 147.1 150.9
51-81 6A.1 35-49 41.2 49-57 5''. `'6.1
usually fully
scaled
none
none
9.0-12.0 mm.
scaled ex^ept
for dorsal p
ventral and
peduncle areas
uniform from
head to back
none
8.5-10.0 mm.
sane patterr :;.S
In Alega;,s by *,
with fewer
scales
abrupt in
occiput re;;inn
present
6.0-7.5 mm,
came as in
-1^?arls with
i «r.-er scales
abrupt in
onr. iput region
present
6.0 mm.
*This discrepancy could be due to possible variation in method of measurement.
My measurement was taken from anterior orbit of eye to tip of snout, whereas
Holden's measurement may have been taken from posterior orbit of eye.