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22 GILA ATRARIA MEANS AND RANGES OF SELECTED MORPHOMETRIes, EXPRESSED AS PERCENT STANDARD LENGTH, AND MYOMERE COUNTS for each larval phase and the early juveniles. See Figure 4 for explanation of abbreviations and method- SELECTED ADULT MERISTICS. Mean or modal values are overlined, if significant, and rare or questionable extremes are enclosed by parentheses.1 Drays: i-ii,8-9-10 A rays: i-ii ,7-8-9 Crays: vii-viii,19,vi-vii P2 rays: 8-9 Pl rays: 16 Ver'tebrae: 39 Branchiostegal rays: 3 Gill rakers: 8-16 Scales, lateral series: Pharyngeal teeth: 2,5 / 4,2 (45}50-59-65 (variations common) SIZE (mm SL / TL) AT THE APPARENT ONSET OF SELECTED DEVELOPMENTAL EVENTS. Based on structures observable under low power magnification; rare or questionable extremes are enclosed in parentheses. Hatching: 4 / 4 Eyes pigmented: upon or shortly after hatching Pl bud formation: upon or shortly after hatching P2 bud formation: 8-9 / 10 Yolk completely absorbed: 6-7 / 7 Finfold completely absorbed: > 12 / 14, < 19 / 24 Gut coil or loop formation, as evidenced by at least a 900 bend: 9 / 10-11 Segmentation evident in the principal rays of all fins: > 12 / 14, < 19 / 24 Fi n rays First observed Adult complement Principal C: 7 / 7 9 / 10 Secondary C: 8 / 8-9 > 12 / 14, < 19 / 24 Principal D: 8 / 9-10 (8)9 / 10-11 Principal A: 8 / 9- 1 0 g / 11 All Pl: 9 / 11 > 12 / 14, < 19 / 24 All P2: >9/11,<12/14 > 12 / 14, < 19 / 24 Scales: initial appearance: 16? / ? full coverage: > 19 / 24 lBased in part on data from: Baxter and Simon (l970), LaRivers (1962), Minckley (1973), and Sigler and Miller (1963).