Body shape or form is an important phenotypic character of aquatic organisms and reflects morphological adaptation linked to life-history strategies in the 3-dimensional volume of aquatic habitats (Purcell 1977, Vogel 1994). Body shape has been studied extensively for aquatic vertebrates, especially fish, with a focus on morphological properties that contribute to feeding and locomotion (Webb 1984, Haas et al. 2010, Farré et al. 2013). Body shape is also a valuable functional attribute of aquatic insects, but it has received only sporadic attention, generally focused on a limited selection of families, genera, and species (Sheldon 1980, Smith and Dartnall 1980, Hogue and Hawkins 1991, Sites et al. 1996, Arnqvist and Johansson 1998, Funk et al. 2008, Giacomini and de Marco 2008, Lee and Lin 2012, Müller-Peddinghaus and Hering 2013) with little integration among studies regarding the influence of environmental characteristics on aquatic insect shape.