7723

• UCREFRP Catalog Number: 7723
• Author: Snyder, D. E. and R. T. Muth
• Title: Editor
• USFW Year: Series
• USFW - Doc Type: 1990
• Copyright Material: NO

7 (2A,2B). Dorsal surface lateral to midline
from shortly behind head to about
2/3 distance to last myomeres with
a. distinct continuous or nearly continuous
lines of melanophores along (parallel
to) each side of dorsal midline (Fig.

17) ..................... X. texonus
b. distinctly shorter or discontinuous lines
of melanophores along one or both sides
of dorsal midline or with no distinct
lines of melanophores along either side
of dorsal midline (Figs. 45, 87) ........ 8

8 (7). Pigmentation of peritoneum
~l. absent on lateral and ventro-Iateral
surfaces (Figs. 44, 87) . . . . . . . . . . . . . . . 9
h. at least sparse or patchy on lateral
surfaces (Fig. 45) ........ . C. discobolus

9 (8). Principal dorsal rID rays

a. absent ........................ 288
b. present (at least one) . . . . . . C. discobolus

10 (1). Ventral midline from shortly behind
heart region to near vent with
a. ~1 melanophores in a continuous or
nearly continuous line or narrow band
(if midline pigment extends into
branchial region anterior to heart, most
probably C. commersoni; Figs. 31, 73) . . 11
b. ~1 melanophores in a shorter or a
distinctly discontinuous line (Fig. 45) . .. 15
c. 7-20 melanophores (Fig. 17) . . . . . . . . . 20
d. 1-6 melanophores or without pigment
(Fig. 87) ....................... 23

11 (10). Dorsal surface lateral to midline from
shortly behind head to about 2/3
distance to last myomeres with
a. distinct continuous or nearly continuous
lines of melanophores along (parallel to)
each side of dorsal midline (Figs. 30,
31) .................. C. commersoni
b. distinctly shorter or discontinuous lines
of melanophores along one or both sides
of dorsal midline (Figs. 72, 73) ....... 12
c. no distinct lines of melanophores along
either side of dorsal midline (Figs. 44,

45) ........................... 13

12 (11). Melanophores in lines lateral (and
parallel) to dorsal midline between
head and 2/3 distance to last my a-
meres mostly in
a. single file (Figs. 31, 72, 73) . . . . . . . . . . 13
b. obliquely oriented pairs or groups
resulting in a "herring bone" or "tractor
tread" pattern (Figs. 30, 59) C. commersoni

13 (11,12). Pigmentation of peritoneum
a. absent on lateral and ventro-Iateral
surfaces (Figs. 30, 72) . . . . . . . . . . . . . . 14
b. at least sparse or patchy on lateral
surfaces (Fig. 73) ....... C. platyrhynchus

14 (13). Principal dorsal fin rays
a. absent ........................ 225
b. present (at least one) . . . . . . . . . . . .. 119

15 (10). Dorsal surface lateral to midline from
shortly behind head to about 2/3
distance to last myomeres with
a. distinct continuous or nearly continuous
lines of melanophores along (parallel to)
each side of dorsal midline (Figs. 30,
31) ... . . . . . . . . . . . . . . C. commersoni
b. distinctly shorter or discontinuous lines
of melanophores along one or both sides
of dorsal midline (Figs. 72, 73) .. . . . . . 16
c. no distinct lines of melanophores along
either side of dorsal midline (Figs. 44,

45) ................. . . . . . . . . . 17

16 (15). Melanophores in lines lateral (and
parallel) to dorsal midline between
head and 2/3 distance to last my a-
meres mostly in
a. single me (FigS. 31, 43, 72, 73) ....... 17
b. obliquely oriented pairs or groups
resulting in a "herring bone" or "tractor
tread" pattern (FigS. 30, 59) C. commersoni

17 (15,16). Pigmentation of peritoneum
a. absent on lateral and ventra-lateral
surfaces (Figs. 30, 44, 72) ... . . . . . . .. 18
b. at least sparse or patchy on lateral
surfaces (Figs. 45, 73) ............. 19

18 (17). Principal dorsal rID rays

a. absent ... . . . . . . . . . . . . . . . . . . . .. 211
b. present (at least one) . . . . . . . . . . . .. 122

19 (17). Principal dorsal rm rays

a. absent ..... . . . . . . . . . . . . . . . . . .. 231
b. present (at least one) .. . . . . . . . . . .. 125

20 (10). Dorsal surface lateral to midline from
shortly behind head to about 2/3
distance to last myomeres with
a. distinct continuous or nearly continuous
lines of melanophores along (parallel to)
each side of dorsal midline (Fig. 17) . . . . .

. . . . . . . . . . . . . . . . . . . . . C. ardens
b. distinctly shorter or discontinuous lines
of melanophores along one or both sides
of dorsal midline or with no distinct
lines of melanophores along either side
of dorsal midline (FigS. 16, 44, 45) .... 21

21 (20). Pigmentation of peritoneum
a. absent on lateral and ventra-lateral
surfaces (Figs. 17,44) ............. 22
b. at least sparse or patchy on lateral
surfaces (Hg. 45) .... . . . . . C. discobolus

22 (21). Principal dorsal rID rays

a. absent .... . . . . . . . . . . . . . . . . . . .. 271
b. present (at least one) ............ 146

55