Much has been written on the part played by the environment in changing secondary characters of the more plastic invertebrates….During February, 1934, a collecting trip was made to San Marcos, Texas, where two contrasting aquatic habitats were found, both of which were inhabited by the branchiate snail Goniobasis comalensis. Several hundred individuals were collected from each habitat, the shells measured, and a statistical study made of size differences.
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Cheatum, Elmer P. and Mouzon,, E. D. Jr.
"Biometrical Study Of Goniobasis Comalensis Pilsbry From Two Diverse Habitats,"
Field and Laboratory: Vol. 3
Available at: https://scholar.smu.edu/fieldandlab/vol3/iss1/7