Assessing the morphological variability of Unio delphinus Spengler, 1783 (Bivalvia: Unionidae) using geometric morphometry

We acknowledge the valuable comments and suggestions made by Daniel L. Graf, Simon Schneider and an anonymous reviewer on an earlier version of the manuscript. We are also grateful to John Babaluk for his comments and for improving the grammar and style of the manuscript. P.M. and M.M.R. are supported by Fundacao para a Ciencia e a Tecnologia through a postdoctoral scholarship (SFRH/BPD/40832/2007) and 'Ciencia 2008' contract, respectively.