7258

• UCREFRP Catalog Number: 7258
• Author: Rosenfeld, M. J.
• Title: Morphometry in Chubs of the Genus
• USFW Year: 1986.
• Copyright Material: NO

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Figure 3. Significant distance measures for Colorado River chubs
as determined with principal component analysis on measurements
taken from photographs. Solid lines denote measurements with
significant loadings on principal component axis 2; dashed lines
indicate significant measurements on principal component axis 3.
Results suggested the presence 'of at least two morphologically
distinct lineages in the Upper Colorado River drainage:
"roundtail" and "humpback" chub. Previously unidentifiable fish
from Blackrocks were indicated to be uhumpback" chubs. The
measurements are as follows: (2) mouth length; (3) pre-orbital
length; (4) anteriormost edge of Qrbit to occiput; (5) snout to
occiput; (9) occiput to dorsalmost part of opercular opening;
(10) anal fin base; (14) anteriormost edge of orbit to posterior
tip of mouth; (23) dorsal fin base origin to pelvic fin base; (25)
dorsal fin base origin to anal fin base origin; (26) pelvic fin
origin to posteriormost part of dorsal fin base; (28) posterior-
most part of dorsal fin base to posteriormost part of anal fin
base.