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Stone darter
The stone darter (''Etheostoma derivativum'') is a species of darter endemic to the eastern United States.
==Geographic distribution==
The stone darter is found within the lower Cumberland River drainage, Southern Kentucky, and North-Central Tennessee. Specimens have been collected in Todd County and Logan County in Kentucky and in the West Fork Stones River in Tennessee.〔Page, Lawrence M., Michael Hardman, and Thomas J. Near. "Phylogenetic relationships of barcheek darters (Percidae: Etheostoma, subgenus Catonotus) with descriptions of two new species." Journal Information 2003.3 (2003)〕 Since the fish is found in the west fork of Stones River, it was given the common name stone darter. Collections were also made in Whites Creek, Marrowbone Creek, Sycamore Creek, Louise Creek, Harpeth River, and Red River. It is native to these waters and is found year round.〔"Etheostoma Derivativum." Encyclopedia of Life. Ed. Richard L. Mayden. N.p., n.d. Web. 20 Nov. 2013. http://eol.org/pages/219397/overview.〕 The distribution is very small because this species has only just been recognized as a divergent species from ''Etheostoma virgatum'' in the past 10 years. The stone darter inhabits shallow pools, the bases and margins of riffles, and/or the margins of rocky bands over gravel and sand with slab rocks present.〔Hopkins II, Robert L., Fisk, Lisa J. "Status of the Stone Darter, Etheostoma derivativum, in Kentucky" American Currents (Aug 2008). Vol. 34 No. 3. 14-22.〕 Within the Cumberland River system, species in the subgenus ''Catonotus'' are separated and live in one-species segments which create an almost totally nonoverlapping mosaic in the Cumberland, Tennessee, and Green River systems.〔Page, Lawrence M., and Douglas W. Schemske. "The effect of interspecific competition on the distribution and size of darters of the subgenus Catonotus (Percidae: Etheostoma)." Copeia (1978): 406-412.〕
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