Howells Freshwater Mussels App

SMOOTH PIMPLEBACK (Quadrula houstonensis)Threatened (legally) TPWD – Proposed USFWS• Endemic to the Brazos and Colorado systems of Central Texas.• Nearly eliminated from the Colorado, with small numbers in the HighlandLakes area and a site on the lower Colorado River.• Recently found to be more numerous in the central Brazos River basinthan long thought, but with some populations in obvious decline andthe long-term status of others uncertain.