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<br />I <br /> <br /> <br />( <br /> <br />( <br /> <br />.. <br /> <br /> <br />Gila cypha, humpback chub <br />dorsal rays usually 9, but not infrequently 10 <br />anal rays usually 10, but sometimes 9, so a C9unt of 9/10 <br />can inspire some confidence if ,the profile is' right, <br />but you must depend on other. characters if the count <br />is 9/9 or 10/10, because it could still be a cypha. <br />head small in all dimensions, concave on top <br />profile with abrupt hump behind head except in jl1venile~ <br />and oddballs that mayor may not be hybrids <br />caudal peduncle modestly slender, the ratio of its minimum <br />depth divided into the length of the dorsal or anal <br />fin base 2.2 to 3.2, usually 2.4 to 2.8. <br />all fins large, note especially the pectorals and. caudal <br />gill rakers 13 to 17, usually 14-16 (often a large nostril flap) <br />vertebrae 41-44 (not counting Weberian apparatus) <br />snout long and sometimes fleshy, overhanging short lower jaw <br /> <br />Hybrids may go either way. Those with roundtails have larger <br />heads and caudal peduncles, with large mouths and smaller fins. <br />Hybrids with bony tails have small heads, slender peduncles, <br />long, peduncles, and large fins. Hybrids are recognizeable by <br />the mixture of some intermediate characters and some clearly <br />typical for one of the parents. The nature of the hump and the <br />finray counts are not proof of anything by themselves. <br />