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<br />22 (20). Pigmentation on lateral surfaces of
<br />peritoneum
<br />a. absent (F"1gs. 19, 60, 88, 89) ......... 23
<br />b. sparse or patchy (Figs. 18, 32, 33, 75) .. 24
<br />
<br />23 (22). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />
<br />(FIgS. 17, 87) .................... 68
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most
<br />anterior portion of snout) (Figs. 18, 60,
<br />
<br />88JO
<br />
<br />24 (22). Pigmentation on ventro-Iateral surfaces
<br />of peritoneum
<br />a. absent (Figs. 18, 60) . . . . . . . . . . . . . . . 25
<br />b. sparse or patchy (Fig. 33) . . C. commersoni
<br />c. uniformly light (Fig. 75) .. C. platyrhynchus
<br />
<br />25 (24). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 17) .................. C. ardens
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (Figs. 18,32, 60) . . 59
<br />
<br />26 (20). Pigmentation on lateral surfaces of
<br />peritoneum
<br />a. absent (Figs. 88, 89) . . . . . . . . . X. texanus
<br />b. sparse or patchy (Figs. 32, 33, 75) . . . .. 27
<br />c. uniformly light to dark (Fig. 47)
<br />. . . . . . . . . . . . . . . . . . . C. discobolus
<br />
<br />27 (26). Pigmentation on ventro-Iateral surfaces
<br />of peritoneum
<br />a. absent or sparse to patchy (Figs. 32,
<br />33) .................. C. commersoni
<br />b. uniformly light (Fig. 75) .. C. platyrhynchus
<br />
<br />28 (1). Gut (Fig. 5) with
<br />a. at least 90" bend or partial s-shaped loop
<br />(gut phase 2) . . . . . . . . . . . . . C. /atipinnis
<br />b. full loop (s-shape to near anterior end
<br />of visceral cavity) but with neither limb
<br />of loop completely across over ventral
<br />midline (gut phase 3) .............. 29
<br />c. at least one limb of loop fully across
<br />ventral midline but not yet with both
<br />limbs across fully to opposite side (gut
<br />phase 4) ....................... 33
<br />d. both limbs of loop across midline fully
<br />to opposite side (four segments of gut
<br />crossing nearly perpendicular to body
<br />axis) or with more extensive coil
<br />development (gut phase 5) .. C. discobolus
<br />
<br />29 (28). Pigmentation on lateral surfaces of
<br />peritoneum
<br />a. absent (FIgS. 19, 60, 89) ............ 30
<br />b. sparse or patchy (Figs. 18, 33, 75) . . . . . 31
<br />
<br />30 (29). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 87) ................. X. lexanus
<br />
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (Figs. 19, 60, 89) . 60
<br />
<br />31 (29). Pigmentation on ventro-lateral surfaces
<br />of peritoneum
<br />a. absent (Fig. 18) .................. 32
<br />b. sparse or patchy (Fig. 33) . . . . . . . . . . . 37
<br />c. uniformly light to dark (Fig. 75)
<br />. ..... . .. . . ... . . C.platyrhynchus
<br />
<br />32 (31). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 87) ................. X. texanus
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (FIgS. 19, 33, 60,
<br />
<br />89) .. . . . . . . . . . . . . . . . . . . . . . . . . 58
<br />
<br />33 (28). Pigmentation on lateral surfaces of
<br />peritoneum
<br />a. absent (Figs. 19, 89) . . . . . . . . . . . . . . . 34
<br />b. sparse or patchy (Figs. 18, 33, 75) . . . . . 35
<br />c. uniformly dark (Figs. 47, 48) C. discobo/us
<br />
<br />34 (33). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 87) ................. X. texanus
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (Figs. 19,89) .... 68
<br />
<br />35 (33). Pigmentation on ventro-Iateral surfaces
<br />of peritoneum
<br />a. absent (Fig. 18) .................. 36
<br />b. sparse or patchy (Fig. 33) . . . . . . . . . . . 37
<br />c. uniformly light to dark (Fig. 75)
<br />. .... .. . . . .. . .. . C.p/atyrhynchus
<br />
<br />36 (35). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 87) ................. X. texanus
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (Figs. 19,33,89) . 67
<br />
<br />37 (31,35). Mouth
<br />a. terminal (above bottom-of-eye level)
<br />(Fig. 87) ................. X. lexanus
<br />b. low terminal (at or below bottom-of-eye
<br />level) to slightly subterminal (mouth,
<br />including upper lip, not the most anter-
<br />ior portion of snout) (Figs. 33, 89) .... 73
<br />
<br />38 (1). Gut (Fig. 5) with
<br />a. at least 90" bend or partial s-shaped
<br />loop (gut phase 2) ......... C. latipinnis
<br />b. full loop (s-shape to near anterior end
<br />of visceral cavity) but with neither limb
<br />of loop completely across over ventral
<br />midline (gut phase 3) . . . . . . . . . . . . . . 39
<br />
<br />75
<br />
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