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144 (143). Yolk length a. s20% SL ................ X. texonus b. 2:21% SL ................ X. texonus C. commersoni 145 (143). Yolk length a. s20% SL ..................... 148 b. 2:21% SL ..................... 152 146 (133). Length from anterior margin of snout to posterior margin of eye a. 6-8% SL ...................... 147 b. 9-10% SL ............ C. p/atyrhynchus 147 (146). Number of myomeres to posterior margin of vent a. 34-36 ............... C.platyrhynchus b. 37-39 ........................ 148 c. 40-41 ................... X. texonus 148 (135,145,147). Length from anterior margin of snout to origin of pectoral fm a. 12-14% SL ............... X. texonus b. 15-19% SL ............... X. texanus C. platyrhynchus 149 (133). Length from anterior margin of snout to posterior margin of eye a. 6-8% SL ...................... 150 b. 9% SL ....................... 151 c. 10% SL . . . . . . . . . . . . . . C. platyrhynchus 150 (149). Number of myomeres to posterior margin of vent a. 34-36 ........................ 155 b. 37-39 ........................ 152 c. 40-41 ................... X. texanus C. commersoni 151 (149). Number of myomeres to posterior margin of vent a. 34-39 ........................ 155 b. 40-41 ................ C. commersoni 152 (145,150). Length from anterior margin of snout to origin of pectoral fm a. 12-14% SL ............... X. texonus C. commersoni b. 15-19% SL ............... X. texonus C. commersoni C. platyrhynchus 153 (142). Number of myomeres to posterior margin of vent a. 34-39 ........................ 154 b. 40-41 ................ C. commersoni 154 (143,153). Yolk length a. s20% SL ............ C. platyrhynchus b. 2:21% SL ..................... 155 155 (150,151,154). Length from anterior margin of snout to origin of pectoral fm a. 12-14% SL ............ C. commersoni b. 15-19% SL ............ C. commersoni C. platyrhynchus Flexion Mesolarvae -- at least one fm ray present in caudal fin but not the full adult complement of 18 principal rays (definition abbreviated for species of concern; Fig. 16). 1. Standard (notochord) length (SL; Fig. 4) a. 10 mm . . . . . . . . . . . . . . . . . . . . . . . . . . 8 b. 11 mm . . . . . . . . . . . . . . . . . . . . . . . .. 11 c. 12 mm .. .. .. .. .. .. .. .. .. . .. .. .. 23 d. 13 mm . . . . . . . . . . . . . . . . . . . . . . . .. 19 e. 14 mm . . . . . . . . . . . . . . . . . . . . . . . . . . 3 f. 15 mm . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 (1). Yolk a. present ................. C./atipinnis b. absent ................ C. commersoni 3 (1). Yolk a. present ......................... 4 b. absent .......................... 7 4 (3). Maximum depth of yolk a. ~% SL . . . . . . . . . . . . . . . . . C. latipinnis b. S4% SL . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 (4). Length of yolk a. ~19% SL . . . . . . . . . . . . . . . . . . . . . . . . 6 b. ::518% SL . . . . . . . . . . . . . . C. commersoni 6 (5). Ventral midline from shortly behind heart region to near vent a. with 2:21 melanophores (Fig. 30) . . . . . . . . . . . . . . . . . C. commersoni b. with 1-20 melanophores (Fig. 58) ................... C.latipinnis 7 (3). Ventral midline from shortly behind heart region to near vent a. with 2:21 melanophores (if in a contin- uous or nearly continuous line and mid- line pigment extends into branchial region anterior to heart, probably C. commersoni; Fig.31) (Figs. 30, 72) .... 45 b. with s20 melanophores or without pigment (Fig. 16) . . . . . . . . . . . . C. ardens 8 (1). Yolk a. present .........................9 b. absent '" . . . . . . . . . . . . . . . . . . . . . . 10 9 (8). Maximum depth of yolk a. ~% SL . . . . . . . . . . . . . . .. C. discobolus b. S4% SL . . . . . . . . . . . . . . . . . . . . . . .. 10 10 (8,9). Ventral midline from shortly behind heart region to near vent a. with 2:21 melanophores in a continuous or nearly continuous line or narrow band (Fig. 30) .......... C. commersoni b. with 2:21 melanophores in a shorter or a distinctly discontinuous line (Fig. 44) . 26 c. with 7-20 melanophores (Fig. 17) . . . . . . . . . . . . . . . . . . C. discobolus 47