MolluscaBase taxon details
Eupera formosa (F. B. Meek & Hayden, 1856) †
1568562 (urn:lsid:marinespecies.org:taxname:1568562)
accepted
Species
Cyclas formosa F. B. Meek & Hayden, 1856 † · unaccepted > superseded combination
Cyclas fragilis F. B. Meek & Hayden, 1856 † · unaccepted (subjective synonym)
Sphaerium formosum (F. B. Meek & Hayden, 1856) † · unaccepted > superseded combination
Sphaerium fragilis (F. B. Meek & Hayden, 1856) † · unaccepted (subjective synonym)
fossil only
(of Cyclas formosa F. B. Meek & Hayden, 1856 †) Meek, F.B.; Hayden, F.V. (1856). Descriptions of New Species of Acephala and Gastropoda, from the Tertiary formations of Nebraska Territory, with some general remarks on the Geology of the country about the sources of the Missouri River. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 8: 111-126., available online at https://www.biodiversitylibrary.org/page/1935165
page(s): 115 [details]
page(s): 115 [details]
Holotype (of Cyclas formosa F. B. Meek & Hayden, 1856)...
, Type locality contained in North Dakota
Holotype (of Cyclas formosa F. B. Meek & Hayden, 1856) USNM 2125 [details]
type locality contained in North Dakota [from synonym] [view taxon] [details]
MolluscaBase eds. (2025). MolluscaBase. Eupera formosa (Meek & Hayden, 1856) †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1568562 on 2026-09-03
Date
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original description
(of Cyclas formosa F. B. Meek & Hayden, 1856 †) Meek, F.B.; Hayden, F.V. (1856). Descriptions of New Species of Acephala and Gastropoda, from the Tertiary formations of Nebraska Territory, with some general remarks on the Geology of the country about the sources of the Missouri River. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 8: 111-126., available online at https://www.biodiversitylibrary.org/page/1935165
page(s): 115 [details]
original description (of Cyclas fragilis F. B. Meek & Hayden, 1856 †) Meek, F.B.; Hayden, F.V. (1856). Descriptions of New Species of Acephala and Gastropoda, from the Tertiary formations of Nebraska Territory, with some general remarks on the Geology of the country about the sources of the Missouri River. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 8: 111-126., available online at https://www.biodiversitylibrary.org/page/1935165
page(s): 115 [details]
basis of record Hartman, J.H. (1998). The stratigraphy of Mesozoic and early Cenozoic nonmarine mollusks of Colorado. <em>Proceedings of the Denver Museum of Natural History.</em> 3(14): 1-15.
page(s): pl. 2, fig. 30 [details] Available for editors
[request]
page(s): 115 [details]
original description (of Cyclas fragilis F. B. Meek & Hayden, 1856 †) Meek, F.B.; Hayden, F.V. (1856). Descriptions of New Species of Acephala and Gastropoda, from the Tertiary formations of Nebraska Territory, with some general remarks on the Geology of the country about the sources of the Missouri River. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 8: 111-126., available online at https://www.biodiversitylibrary.org/page/1935165
page(s): 115 [details]
basis of record Hartman, J.H. (1998). The stratigraphy of Mesozoic and early Cenozoic nonmarine mollusks of Colorado. <em>Proceedings of the Denver Museum of Natural History.</em> 3(14): 1-15.
page(s): pl. 2, fig. 30 [details] Available for editors
[request]
Present Inaccurate Introduced: alien Containing type locality
Holotype (of Cyclas formosa F. B. Meek & Hayden, 1856) USNM 2125 [details]
