eurystomus Hubbs & Bailey, 1947
contributors to this species:
||Occurs in subterranean
waters and is threatened by groundwater pollution. Cited in the
IUCN Red List Status of 2011 as vulnerable. Below the city of
San Antonio Texas lies a vast aquifer known as the Edwards (Balcones
Fault Zone) Aquifer. Two rare and unusual catfish reside in the
aquifer, Satan eurystomus, the widemouth blindcat and
the toothless blindcat. They are the only known troglobitic
catfish in the United States. The only specimens of both species
ever collected have come from deep (1,200' to 1,500') artesian
wells within the city of San Antonio itself and parts of southern
Bexar County. The Balcones Fault Zone is a complex system of limestone
strata (Edwards Limestone Formation) that has been fractured and
eroded over time by geological forces. Water travels not only
through numerous cracks and fissures but also through massive
underground caverns, streams and rivers. The limestone strata
slopes towards the Gulf of Mexico. In northern Bexar County the
limestone formation is exposed on the surface. In the southern
part of the county the formation is 3,000 feet underground. San
Antonio's water supply comes from an area of the aquifer known
as San Antonio Pool and is considered the "Good Water"
zone. South of the Balcones Fault Zone lies the Gulf Coastal Plain
which contains anaerobic, saline and sulfurous groundwater known
as the "Bad Water" zone. Water from both zones meet
and mix in a line that roughly parallels Interstate Highway 35.
Blindcats reside along this narrow mixing zone and may be dependant
on the unique environment created at the mixing point of these
North America: 5
artesian wells penetrating San Antonio Pool of Edwards Aquifer in
and near San Antonio, Bexar County in Texas, USA (29°30'N,98°30'W)
||IUCN 2011 IUCN
Red List of Threatened Species. Version 2011.2. IUCN
2011. IUCN Red List of Threatened Species.
ScotCat Article: Garold W. Sneegas & Dean
A. Hendrickson, Ph.D., Extreme Catfish.
Froese, R. and D. Pauly. Editors. 2009. FishBase.
World Wide Web electronic publication. www.fishbase.org, version