Mesodon thyroidus, from Michigan. This is one of the larger (shell diameter up to 3 cm) land snails of eastern North America. As a pulmonate snail, most of the last (largest) whorl is occupied by the lung. Blood vessels of the lung surface are clearly visible through the shell. All geophile snails have their eyes on the tips of the larger, upper tentacles.
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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To cite this page: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2019. The Animal Diversity Web (online). Accessed at https://animaldiversity.org.
Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.