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

b. pigmented with 1-5 melanophores (Fig.

44) ........................... 43
c. pigmented with ~ melanophores (Fig.
46) ................... C.discobolus

43 (42). Lateral surface of body below
horizontal myosepta (lateral
midline) (exclusive of pigment
associated with horizontal myosepta,
air bladder, visceral peritoneum, or
gut)
a. unpigmented (Fig. 58) ..... C. discobolus
C. latipinnis
b. pigmented with at least 1 melanophore
(Fig. 45) ............... C. discobolus

44 (19,23). Ventral midline from shortly behind
heart region to near vent
a. with ~1 melanophores in a continuous
or nearly continuous line or narrow band
(if midline pigment extends into bran-
chial region anterior to heart, probably
C. commersoni; Fig. 31) (Figs. 30, 72) . . 45
b. with ~1 melanophores in a shorter or
a distinctly discontinuous line (Fig. 44) . 46
c. with 7-1IJ melanophores (Fig. 17) ..... 47
d. with S6 melanophores or without pig-
ment (Figs. 16, 86) . . . . . . . . . . . . . . . . 48

45 (7,15,44). Dorsal body pigmentation between
head and last myomere
a. scattered with no distinct lines of melan-
ophores on or lateral (and parallel) to
dorsal midline (Fig. 44) .. C. platyrhynchus
b. including at least a partial distinct line of
melanophores on or lateral (and paral-
lel) to dorsal midline (Figs. 30, 72) .... 76

46 (15,44). Dorsal body pigmentation between
head and last myomere
a. scattered with no distinct lines of melan-
ophores on or lateral (and parallel) to
dorsal midline (Fig. 44) ............ 72
b. including at least a partial distinct line of
melanophores on or lateral (and paral-
lel) to dorsal midline (Figs. 30, 45, 72) . 80

47 (22,25,44). Dorsal body pigmentation
between head and last myomere
a. scattered with no distinct lines of melan-
ophores on or lateral (and parallel) to
dorsal midline (Fig. 44) .... C. discobolus
b. including at least a partial distinct line of
melanophores on or lateral (and paral-
lel) to dorsal midline (Figs. 16,45) .... 62

48 (44). Dorsal body pigmentation between head
and last myomere
a. scattered with no distinct lines of melan-
ophores on or lateral (and parallel) to
dorsal midline (Fig. 44) .... C. discobolus
b. including at least a partial distinct line of
melanophores on or lateral (and paral-
lel) to dorsal midline (F'tgs. 16, 45, 86) . 49

49 (48). Dorsal surface lateral to midline from
shortly behind head to about 2/3
distance to last myomeres
a. with distinct lines of melanophores along
(parallel to) one or both sides of dorsal
midline (Figs. 16, 86) .............. 50
b. without distinct lines of melanophores
along either side of dorsal midline (Fig.
44) . . . . . . . . . . . . . . . . . . C. discobolus

so (49). Dorsal midline from shortly behind
head to near last myomeres
a. with ill melanophores in a distinct
continuous or nearly continuous line
(Fig. 43) ....................... 51
b. with ill melanophores but in one or
more shorter segments or a distinctly
discontinuous line (Fig. 45) ......... 55
c. with:S24 melanophores in one or more
short lines, a discontinuous, well-spaced
line or (rarely) no distinct line of
melanophores (Figs. 16, 86) ......... 53

51 (18,SO). Dorsal surface of head pigmented
a. only over hindbrain (posterior to middle
of eyes; Fig. 86) . . . . . . . . . . . . X. texanus
b. over both mid- and hindbrain (anterior
and posterior to middle of eyes; Fig.

44) . . . . . . . . . . . . . . . . . . . . . . . . . . 52

52 (51). Ventral to ventro-Iateral surfaces of gill
covers (opercula)
a. unpigmented (Figs. 44, 86) .......... 58
b. pigmented (Figs. 17,31) . . . . . . X. texanus

53 (SO). Dorsal surface of head pigmented
a. only over hindbrain (posterior to middle
of eyes; Fig. 86) . . . . . . . . . . . . X. texanus
b. over both mid- and hindbrain (anterior
and posterior to middle of eyes; Fig.

16) ..........................54

54 (53). Ventral to ventra-lateral surfaces of gill
covers (opercula)
a. unpigmented or pigmented but not in
distinct oblique rows (Figs. 16, 86) .... 60
b. pigmented in a distinct oblique row of 3
or more melanophores near or along
ventral margin of one or both preoper-
cles (Figs. 17, 31) . . . . . . . . . . . X. texanus

55 (SO). Dorsal surface of head pigmented
a. only over hindbrain (posterior to middle
of eyes; Fig. 86) ..... . . . . . . . X. texanus
b. over both mid- and hindbrain (anterior
and posterior to middle of eyes; Figs.

16, 44) . . . . . . . . . . . . . . . . . . . . . . . . . 56

56 (55). Ventral to ventra-lateral surfaces of gill
covers (opercula)
a. unpigmented (F'tgs. 44, 86) .. . . . . . . . . 57
b. pigmented in a distinct oblique row of 3
or more melanophores near or along
ventral margin of 1 or both preopercles
(FIgS. 17, 31) .............. X. texanus

so