Ancylus, from Lake Ochrid, Macedonia. Ancient lakes have their own endemic species of animals, including mollusks. In Europe, the ancient Lake Ochrid has a large and highly endemic molluscan fauna. These six species of Ancylus do not occur anywhere outside the lake.
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2018. The Animal Diversity Web (online). Accessed at https://animaldiversity.org.
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