Texas Parks and Wildlife is reporting that a zebra mussel (Dreissena polymorpha) was found in Lake Texoma earlier this April. Lake Texoma has already had four documented near misses, where boats with zebra mussels were prevented from entering the water. The state is asking everyone to keep an eye out for the invasive bivalves and to report any sightings to 1-800-792-4263 (or in Oklahoma call 1-405-521-3721).
P.S. - If you had subscribed to the ISW Twitter feed, you would have found out about zebra mussels in TX hours and hours ago.