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Number Page LIST OF TABLES (continued) Number Page 25 Dimensions of frontoparietal fontanelle for 34 Summary of morphometrics and myomere Catostomus latipinnis . . . . . . . . . . . . . . . . . . 67 counts... for Xyrauchen texanus .......... 77 26 Selected juvenile and adult meristics for 35 Dimensions of frontoparietal fontanelle for Catostomus platyrhynchus .......... . . . . 68 Xyrauchen texanus . . . . . . . . . . . . . . . . . . . . 83 27 Size at apparent onset of selected develop- 36 Comparison of size at onset or transition mental events for Catostomus platyrhynchus . 68 of... developmental events ............. . 85 28 Size at developmental interval and gut phase 37 Comparison of the more diagnostic transitions for Catostomus platyrhynchus . . 69 differences in meristics . . . . . . . . . . . . . . . . . 86 29 Summary of morphometrics and myomere 38 Comparison of the more diagnostic counts... for Catostomus platyrhynchus .... 69 differences in morphometrics . . . . . . . . . . . . 87 30 Dimensions of frontoparietal fontanelle for 39 Comparison of size relative to pigmental Catostomus platyrhynchus ........... . . . 75 state... of peritoneum ................. . 89 31 Selected juvenile and adult meristics for 40 Comparison of the more diagnostic Xyrauchen texanus . . . . . . . . . . . . . . . . . . . . 76 melanophore pigmentation patterns . . . . . . . 90 32 Size at apparent onset of selected develop- 41 Comparison of size relative to mouth mental events for Xyrauchen texanus . . . . . . 76 position and lower lip lobe separation .... . 93 33 Size at developmental interval and gut 42 Comparison of frontoparietal fontanelle size 95 phase transitions for Xyrauchen texanus .. . 77 Number Page LIST OF FIGURES Number Page Cover. Razorback sucker (Xyrauchen texanus) postflexion mesolarvae. Frontispiece. Yearling razorback sucker (Xyrauchen texanus) . . . . . . . . . . . . . . . . . . . . x I The Upper Colorado River System. . . . . . . . . 3 2 Selected anatomical features of cypriniform fish eggs and embryos .................. 8 3 Selected anatomical features of cypriniform fish larvae . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Measures and counts for larval and early juvenile fishes . . . . . . . . . . . . . . . . . . . . . . .. 18 5 Phases of gut coil development in catostomid fish larvae and early juveniles ........... 19 6 Location of selected skeletal features . . . . . . 20 7 Catostomus ardens adult ............... 28 8 Recent distribution of Catostomus ardens .. 28 9 Catostomus ardens proto larva, recently hatched . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 10 Catostomus ardens protolarva ........... 30 II Catostomus ardens flexion meso larva, recently transformed . . . . . . . . . . . . . . . . . . . 31 12 Catostomus ardens postflexion mesolarva .. 31 13 Catostomus ardens metalarva, recently transformed. . . . . . . . . . . . . . . . . . . . . . . . . . 32 14 Catostomus ardens metalarva . . . . . . . . . . . . 32 15 Catostomus ardens juvenile, recently transformed. . . . . . . . . . . . . . . . . . . . . . . . . . 33 16 Catostomus ardens juvenile. . . . . . . . . . . . . 33 17 Selected skeletal features of Catostomus ardens juvenile, 21.4 mm SL .. . . . . . . . . . . 34 18 Selected skeletal features of Catostomus ardens juvenile, 39.5 mm SL ............ 34 19 Intemeurals of Catostomus ardens . . . . . . . . 35 20 Frontoparietal fontanelle of Catostomus ardens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 21 Catostomus catostomus adult. . . . . . . . . . . . 36 22 Recent distribution of Catostomus catostomus .......................... 36 23 Catostomus catostomus proto larva, recently hatched ...................... 38 24 Catostomus catostomus proto larva . . . . . . . . 38 25 Catostomus catostomus flexion meso larva, recently transformed .................. 39 26 Catostomus catostomus postflexion mesolarva . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 27 Catostomus catostomus metalarva, recently transformed . . . . . . . . . . . . . . . . . . . . . . . . . . 40 28 Catostomus catostomus metalarva . . . . . . . . 40 29 Catostomus catostomus juvenile, recently transformed . . . . . . . . . . . . . . . . . . . . . . . . . . 41 30 Catostomus catostomus juvenile ......... 41 31 Selected skeletal features of Catostomus catostomus metalarva . . . . . . . . . . . . . . . . . . 42 32 Selected skeletal features of Catostomus catostomus juvenile ................... 42 33 Intemeurals of Catostomus catostomus .... 43 34 Frontoparietal fontanelle of Catostomus catostomus .......................... 43 35 Catostomus commersoni adult ........... 44 36 Recent distribution of Catostomus commersoni ......................... 44 37 Catostomus commersoni protolarva, recently hatched ............... . . . . . . . 46 38 Catostomus commersoni protolarva . . . . . . . 46 39 Catostomus commersoni flexion mesolarva, recently transformed. . . . . . . . . . . . . . . . . . . 47 VI 1