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

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) ....................... 42
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

39 (38). Pigmentation on lateral surfaces of
peritoneum
a. absent (FIgs. 61, 89) . . . . . . . . . . . . . . . 41
b. sparse or patchy (Fig. 33) . . . . . . . . . . . 40

40 (39). Pigmentation on ventro-lateral surfaces
of peritoneum
a. absent (Figs. 61, 89) . . . . . . . . . . . . . . . 41
b. sparse or patchy (Fig. 33) . . . .. X. texanus

41 (39,40). Mouth
a. terminal (above bottom-of-eye level)
(Fig. 87) ................. X. texanus
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. 61, 89) .... 74

42 (38). Pigmentation on lateral surfaces of
peritoneum
a. absent (Fig. 89) ............ X. texanus
b. sparse or patchy (Fig. 75) . . . . . . . . . . . 43
c. uniformly light . . . . . . . . . C. platyrhynchus
d. uniformly dark (Fig. 47) ............ 44

43 (42). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent or sparse to patchy (Fig. 89)

. . . . . . . . . . . . . . . . . . . . . X. texanus
b. uniformly light to dark (Fig. 76)
. . . . . . . . . . . . . . . . . C. platyrhynchus

44 (42). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. uniformly light . . . . . . . . . C. platyrhynchus
b. uniformly dark (Fig. 76) ............ 45

45 (44). Pigmentation on ventral surface of
peritoneum
a. absent ............... C. platyrhynchus
b. sparse or patchy (Fig. 75) . . . . . . . . . . . 46
c. uniformly light to dark (Fig. 47)
................... C.discobolus

46 (45). Mouth
a. terminal (above bottom-of-eye level) or
low terminal (at or below bottom-of-eye
level) to slightly subterminal (mouth,
including upper lip, not the most anter-
ior portion of snout) (Fig. 75)
. . . . . . . . . . . . . . . . . C. platyrhynchus
b. distinctly subterminal (mouth notably
posterior to most anterior portion of
snout) (Fig. 47) .......... C. discobolus

47 (1). Gut (Fig. 5) with
a. at least 9()0 bend or partial s-shaped
loop (gut phase 2) ......... C. latipinnis
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) .. . . . . . . . . . . . . 48
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) ....................... 50
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

48 (47). Pigmentation on lateral surfaces of
peritoneum
a. absent (Figs. 61, 89) . . . . . . . . . . . . . .. 57
b. sparse or patchy (Fig. 33) . . . . . . . . . . . 49

49 (48). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent (Figs. 61, 89) . . . . . . . . . . . . . . . 57
b. sparse or patchy (Fig. 33) . . . . . X. texanus

50 (47). Pigmentation on lateral surfaces of
peritoneum
a. absent (Figs. 61, 89) . . . . . . . . . . . . . .. 57
b. sparse or patchy (Fig. 75) . . . . . . . . . . . 51
c. uniformly light to dark (Fig. 76)
. . . . . . . . . . . . . . . . C. platyrhynchus

51 (50). Pigmentation on ventro-Iateral surfaces
of peritoneum
a. absent (Figs. 61,89) ............... 57
b. sparse or patchy (Fig. 33) . . . .. X. texanus
c. uniformly dark (Fig. 76) . . C. platyrhynchus

52 (1). Gut (F'tg. 5) with
a. at least 90" bend or partial s-shaped
loop (gut phase 2) ......... C. /atipinnis
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) or gut 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) ....................... 54
c. both limbs of loop across midline fully
to opposite side (four segments of gut
crossing nearly perpendicular to body
axis) or with D10re extensive coil
development (gut phase 5) .. C. discobolus

53 (1). Gut (Fig. 5) with
a. at least 90" bend or partial s-shaped
loop (gut phase 2) ......... C. latipinnis
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) or gut with at

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