The previously unknown queen of Stiphromyrmex robustus (Mayr, 1868) is described. The taxonomic position of the fossil genera Stiphromyrmex Wheeler, 1915, Enneamerus Mayr, 1868, and Thanacomyrmex Chény, Wang & Perrichot, 2019 is discussed, and their placement in the Myrmecina genus-group of the tribe Crematogastrini Forel, 1893 is confirmed. A key for the identification of fossil genera and species of this genus-group is provided.
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Radchenko et al. (2025) studied this question.
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