"* Alvarius fonticola (D. S. Jordan & C. H. Gilbert, 1886)" . . . . "Fountain darter"@en . . "EN" . . . "IUCN3.1" . . "The fountain darter (Etheostoma fonticola) is a small freshwater fish found in the headwaters of only two rivers in Texas, United States: the Comal River and the San Marcos River. It is generally smaller than 3 cm (1.2 in) long and feeds on small invertebrates. It is a federally listed endangered species of the United States and is also listed as endangered by the IUCN."@en . . .