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Catostomus discobolus
The Bluehead sucker (''Catostomus discobolus'') is one of six catostomidae endemic to Arizona. There are a total of 23 members of the'' Catostomus discobolus'', all of which can be found in North America. C. discobolus and C. yarrowi are two sister subspecies that have very similar Arizona habitats.〔Arizona Game and Fish Department. 1988. Threatened Native Wildlife in Arizona. Arizona Game and Fish Department Publication. Phoenix, Arizona. p. 8.〕〔Arizona Game and Fish Department. In prep. Wildlife of special concern in Arizona. Arizona Game and Fish Department Publication. Phoenix, Arizona. 32 pp.〕〔Arizona Game and Fish Department Native Fish Diversity Review. 1995. Tempe, Arizona.〕〔Beyers, D.W. et al. 2001. Habitat Use and Movements of Bluehead Sucker, Flannelmouth Sucker, and Roundtail Chub in the Colorado River. Larval Fish Laboratory, Colorado State University, Fort Collins, CO.〕〔Cope, E.D. 1872. Recent reptiles and fishes in U.S. Geologic Survey of Wyoming and contiguous territory. Special reports Part IV:432-442.〕〔Crabtree, C.B., and D.G. Buth. 1987. Biochemical systematics of the catostomid genus Catostomus: assessment of C. clarki, C. plebeius and C. discobolus including the Zuni Sucker, C.d. yarrowi. Copeia 1987:843-854.〕〔Eddy, S. and J.C. Underhill. 1978. How to know the freshwater fishes, third edition. Wm. C. Brown Company, Dubuque, IA.〕
== Description ==
The ''Bluehead Sucker'' is the largest of all Arizona endemic suckers, reaching lengths of over 11.8 inches. Their colors are very similar to the Desert Sucker, with dark green or dark silvery top portions and light yellow bottoms. The ''Bluehead'' has the largest lips of any sucker and has tiny papillae on the lower lip. This is also the only species with the absence of an inguinal process, just behind the pectoral fins, distinguishing it from the other eight suckers. The lower lip is slightly notched at the midline, with lateral line scales in large numbers that range from 70 to 100. They have 7 to 9 dorsal fin rays and a smaller amount of caudal fin rays. During breeding, the males obtain a blue patch on the top of their large heads, and the lower fins become yellow/orange with red/rosy lateral lines. These drastic coloration changes are probably due to sexual selection and female mate choice. An easy way to distinguish the Bluehead from the other Arizona suckers is to notice the distinct cartilaginous lower jaw.
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