MolluscaBase name details
Helix (Mesodon) dallii Stearns, 1885 †
1079284 (urn:lsid:marinespecies.org:taxname:1079284)
unaccepted > superseded combination
Species
fossil only
White, C.A. (1885). On Marine Eocene, fresh-water Miocene, and other fossil Mollusca of western North America. <em>United States Geological Survey Bulletin.</em> 18: 1-26.
page(s): 178-179, pl. 3, figs 4-6 [details]
page(s): 178-179, pl. 3, figs 4-6 [details]
Note "The North Fork of John Day River, Oregon, at...
From editor or global species database
Type locality "The North Fork of John Day River, Oregon, at the angle of the big bend, longitude 119° 40', latitude 44° 50" (White 1885, p. 174) [details]
Fossil range Exact age uncertain. Claimed to be from the "John Day group" (today John Day Formation), which roughly ranges in age from...
Fossil range Exact age uncertain. Claimed to be from the "John Day group" (today John Day Formation), which roughly ranges in age from the Bartonian (late Eocene) to the Burdigalian (early Miocene). [details]
MolluscaBase eds. (2025). MolluscaBase. Helix (Mesodon) dallii Stearns, 1885 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1079284 on 2025-09-11
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original description
White, C.A. (1885). On Marine Eocene, fresh-water Miocene, and other fossil Mollusca of western North America. <em>United States Geological Survey Bulletin.</em> 18: 1-26.
page(s): 178-179, pl. 3, figs 4-6 [details]
page(s): 178-179, pl. 3, figs 4-6 [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Fossil range Exact age uncertain. Claimed to be from the "John Day group" (today John Day Formation), which roughly ranges in age from the Bartonian (late Eocene) to the Burdigalian (early Miocene). [details]Spelling Subgenus misspelt as "Monodon" in heading of species description. [details]
Type locality "The North Fork of John Day River, Oregon, at the angle of the big bend, longitude 119° 40', latitude 44° 50" (White 1885, p. 174) [details]
