The following websites provide updated distribution data of validated species of mayflies in Texas:
Kondratieff, Boris C. (coordinator). 2000. Mayflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Online. http://www.npwrc.usgs.gov/resource/distr/insects/mfly/index.htm (Version 12DEC2003).
McCafferty, P. 1995-2011. Mayfly Central: The Mayflies of North America. Purdue University. http://www.entm.purdue.edu/mayfly/index.php
BAETISCIDAE
CAENIDAE
EPHEMERELLIDAE
EPHEMERIDAE
HEPTAGENIIDAE
ISONYCHIIDAE
LEPTOHYPHIDAE
LEPTOPHLEBIIDAE
OLIGONEURIIDAE
POLYMITARCYIDAE
POTAMANTHIDAE
PSEUDIRONIDAE
SIPHLONURIDAE