Satan eurystomus
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Satan is a genus of catfish of the family Ictaluridae. Commonly known as the "Wide-mouth blind cat", Satan eurystomus Hubbs, Bailey, 1947 was first found inhabiting a well, and is adapted for a light-less underground environment. They are known only from underground streams more than 1/4 mile below ground and five artesian wells around San Antonio, Texas.
The genus is most closely related to the Flathead Catfishes of the genus Pylodictis.