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

23 (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) . . . 24
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) ....... 25

24 (23). Principal dorsal fm rays
a. absent ........................ 282
b. present (at least one) ......... C. ardens

25 (23). Pigmentation of peritoneum
a. absent on lateral and ventra-lateral sur-
faces (Figs. 17, 44, 87) ..... _ . . . . . . . 26
b. at least sparse or patchy on lateral sur-
faces (Fig. 45) ........... C. discobolus

26 (25). Principal dorsal fm rays
a. absent ........................ 248
b. present (at least one) . . . . . . . . . . .. 146

27 (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 bran-
chial region anterior to heart, most
probably C. commersoni) (Figs. 31, 73) . 28
b. ~1 melanophores in a shorter or a dis-
tinctly discontinuous line (Fig. 45) . . . . . 31
c. 7-ZlJ melanophores (Fig. 17) . . . . . . . . . 35
d. 1-6 melanophores or without pigment
(Fig. 87) ....................... 37

28 (27). 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) ....... 29
c. no distinct lines of melanophores along
either side of dorsal midline (Figs. 44,

45) ........................... 30

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

30 (28,29). Pigmentation of peritoneum
a. absent on lateral and ventra-lateral sur-
faces or present on lateral surfaces only
(Figs. 30, 31, 72) ................ 107
b. at least sparse or patchy on lateral and
ventra-lateral surfaces (Figs. 73, 74)
. . . . . . . . . . . . . . . . C. platyrhynchus

31 (27). 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) . . . . . .. 32
c. no distinct lines of melanophores along
either side of dorsal midline (Figs. 44,

45) . . . . . . . . . . . . . . . . . . . . . . . . . . 33

32 (31). Melanophores in lines lateral (and
parallel) to dorsal midline between
head and 2/3 distance to last my a-
meres mostly in
a. single ftle (Figs. 31, 73) ............ 33
b. obliquely oriented pairs or groups
resulting in a "herring bone" or "tractor
tread" pattern (Figs. 30, 59) C. commersoni

33 (31,32). Pigmentation of peritoneum
a. absent on lateral and ventro-Iateral sur-
faces or present on lateral surfaces only
(Figs. 30, 31, 44, 72) . . . . . . . . . . . . . . . 34
b. at least. sparse or patchy on lateral and
ventro-Iateral surfaces (Figs. 73, 74)
. . .. . . . . .. .... . . C.platyrhynchus

34 (33). Principal dorsal fm rays
a. present (at least one) but full comple-
ment incomplete or unclearly formed . 122
b. present with full (adult) complement
clearly formed and countable (principal
fin rays are sufficiently formed when the
last principal ray, which consists of two
separate ray elements or "branches"
based on the most posterior pterygio-
phore, is well defmed) ............ 158

35 (27). 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. 44, 45) ... . . . . 36

56