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

a. absent (Fig. 18) ......,........... 78
b. sparse or patchy (Figs. 33, 74) ....... 85

7 (4). Pigmentation on lateral surfaces of
peritoneum
a. absent (Fig. 19) ......... C. commersoni
b. sparse or patchy (Figs. 32, 33, 46, 74,

75) ............................8

8 (7). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent (Fig. 19) . 0' . . . . . . . . . . . . . . . 85
b. sparse or patchy (Figs. 33, 46, 74, 75) .. 81

9 (1). Gut (Fig. 5)
a. essentially straight or with bend less than
900 (gut phase 1) . . . . . . . . . . . . C. ardens
b. with at least 90" bend or partial s-shaped
loop (gut phase 2) ................ 16
c. with full loop (s-shape to near anterior
end of visceral cavity) but with neither
limb of loop completely across over
ventral midline (gut phase 3) ........ 10
d. with at least one limb of loop fully
across ventral midline but not yet with
both limbs across fully to opposite side
(gut phase 4) to gut with both limbs of
loop across midline fully to opposite side
(four segments of gut crossing nearly
perpendicular to body axis) or with more
extensive coil development (gut phase
5) ................... C.discobolus

10 (9). Pigmentation on lateral surfaces of
peritoneum
a. absent (Figs. 88, 89) . . . . . . . . . . . . . . . 73
b. sparse or patchy (Figs. 32, 33, 46, 75) .. 11
c. uniformly light to dark (Fig. 47)
. . . . . . . . . . . . . . . . . . . C. discobolus

11 (10). Pigmentation on ventro-lateral surfaces
of peritoneum
a. absent (Fig. 32) .... .' . . . . C. commersoni
b. sparse or patchy (Figs. 33, 46, 75) . . . . . 12
c. uniformly light to dark (Fig. 47)
. . . . . . . . . . . . . . . . . . . C. discobolus

12 (11). Pigmentation on ventral surface of
peritoneum
a. absent (Fig. 32; do not confuse peri-
toneal pigmentation with epidermal or
surface pigmentation) . . . . . . . . . . . . . . 81
b. sparse or patchy (Figs. 46, 74) ....... 88

13 (1). Gut (Fig. 5) with
a. at least 90" bend or partial s-shaped loop
(gut phase 2) .................... 14
b. full loop (s-shape to near anterior end
of visceral cavity) but with neither limb
of loop completely across over ventral
midline (gut phase 3) .,. . . . . . . . . . . . 16
c. at least one limb of loop fully across
ventral midline but not yet with both
limbs across fully to opposite side (gut
phase 4) ....................... 19

d. both limbs of loop across midline fully
to opposite side (four segments of gut
crossing nearly perpendicular to body
axis) or with more extensive coil
development (gut phase 5) .. C. discobolus

14 (13). Pigmentation on lateral surfaces of
peritoneum
a. absent (Fig. 19) .................. 72
b. sparse or patchy (Figs. 18, 32, 33) . . . ., 15

15 (14). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent (Fig. 18) .................. 72
b. sparse or patchy (Fig. 33) . . C. commersoni

16 (9,13). Pigmentation on lateral surfaces of
peritoneum
a. absent (Figs. 19, 88, 89) ............ 67
b. sparse or patchy (Figs. 18, 32, 33) . . . . . 17

17 (16). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent (Fig. 18) .................. 72
b. sparse or patchy (Figs. 33, 74) ....... 18

18 (17). Pigmentation on ventral surface of
peritoneum
a. absent (Fig. 32; do not confuse peri-
toneal pigmentation with epidermal or
surface pigmentation) . . . . . . . . . . . . . . 85
b. sparse or patchy (Figs. 74, 75)
................ C.platyrhynchus

19 (13). Pigmentation on lateral surfaces of
peritoneum
a. absent (Figs. 88, 89) . . . . . . . . . X. texanus
b. sparse or patchy (Fig. 75) . C. platyrhynchus
c. uniformly light to dark (Fig. 47)
.................. C.discoboms

20 (1). Gut (Fig. 5) with
a. at least 90" bend or partial s-shaped
loop (gut phase 2). . . . . . . . . . . . . . . . . 21
b. full loop (s-shape to near anterior end
of visceral cavity) but with neither limb
of loop completely across over ventral
midline (gut phase 3) .. . . . . . . . . . . . . 22
c. at least one limb of loop fully across
ventral midline but not yet with both
limbs across fully to opposite side (gut

phase 4) ....................... 26
d. both limbs of loop across midline fully
to opposite side (four segments of gut
crossing nearly perpendicular to body
axis) or with more extensive coil
development (gut phase 5) .. C. discobolus

21 (20). Mouth
a. terminal (above bottom-of-eye level)
(Fig. 17) .................. C. ardens
b. low terminal (at or below bottom-of-eye
level) to slightly subterminal (mouth,
including upper lip, not the most anter-
ior portion of snout) (Figs. 18,60) .... 61

74