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| Taxon | Status | Relationship Type |
|---|---|---|
| Formica rufa subsp. difficilis Emery | Original name/combination | member |
| Formica rufa difficilis Emery | Subsequent name/combination | member |
| Formica (Formica) difficilis Emery | Subsequent name/combination | member |
| Formica difficilis var. consocians Wheeler | Original name/combination | |
| Formica consocians Wheeler | Subsequent name/combination | |
| Formica difficilis Emery | Subsequent name/combination | member |
| Formica difficilis consocians Wheeler | Subsequent name/combination |
| Citation | Annotation |
|---|---|
| Wheeler W. M., 1904: 371. | original description |
| Emery C., 1925: 256. | cataloged, placed in subgenus Formica (Formica) |
| Creighton W. S., 1950: 500. | junior synonym of Formica difficilis Emery |
| Wheeler W. M., 1910: 570. | distribution |
| Wheeler W. M., 1906: 16. | distribution |
| Wheeler W. M., 1913: 395, 479. | description, keyed, placed in microgyna group, subgenus Formica (Formica), distribution |
| Wheeler W. M., 1916: 577-601. | keyed, distribution |
| Wheeler W. M., 1928: 10. | distribution |
| Cole A. C., 1943: 389. | junior synonym of Formica difficilis Emery |
| Smith M. R., 1947: 623. | included in list of species of microgyna group of Formica (Formica) of the United States |
| Determiner(s) | # of Records |
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| Collecting Method | # of Records |
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