MolluscaBase name details
Polygyra (Mesodon) thyroides (Say, 1817)
1539106 (urn:lsid:marinespecies.org:taxname:1539106)
unaccepted > superseded combination (misspelling of original species name)
Species
(of Helix thyroidus Say, 1817) Say, T. (1817). Descriptions of new species of land and fresh water shells of the United States. <em>Journal of the Academy of Natural Sciences of Philadelphia.</em> 1 (6): 123-126., available online at https://www.biodiversitylibrary.org/page/24680373
page(s): 123 [details]
page(s): 123 [details]
MolluscaBase eds. (2025). MolluscaBase. Polygyra (Mesodon) thyroides (Say, 1817). Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1539106 on 2025-09-11
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original description
(of Helix thyroidus Say, 1817) Say, T. (1817). Descriptions of new species of land and fresh water shells of the United States. <em>Journal of the Academy of Natural Sciences of Philadelphia.</em> 1 (6): 123-126., available online at https://www.biodiversitylibrary.org/page/24680373
page(s): 123 [details]
basis of record Baker, F. C. (1897). On a collection of mollusks from Grand Tower, Illinois. <em>The Nautilus.</em> 11(3): 28-30., available online at https://www.biodiversitylibrary.org/page/1774602
page(s): 29-30 [details]
page(s): 123 [details]
basis of record Baker, F. C. (1897). On a collection of mollusks from Grand Tower, Illinois. <em>The Nautilus.</em> 11(3): 28-30., available online at https://www.biodiversitylibrary.org/page/1774602
page(s): 29-30 [details]
