Gerontoformica rugosa

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Gerontoformica rugosa
Temporal range: Early Cenomanian, Late Cretaceous Burmese amber, Kachin State, Myanmar
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Sphecomyrminae
Tribe: Sphecomyrmini
Genus: Gerontoformica
Species group: uncertain
Species: G. rugosa
Binomial name
Gerontoformica rugosa
(Barden & Grimaldi, 2014)

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  • Gerontoformica rugosus, (1).jpg


Boudinot et al. (2022) - †Gerontoformica rugosa and †Gerontoformica tendir are newly considered as nomina dubia due to their poor preservation, being strongly desiccated and thus distorted. Both species appear to have some degree of abdominal segment III petiolation, as observed in the three confirmed members of the pilosa group, but it cannot be determined whether this is natural or exaggerated due to preservation. It is possible, but not yet determinable, that †G. rugosa is conspecific with †G. gracilis. That †G. rugosa or †G. tendir do have sculptured integument remains possible but requires substantiation via additional material of these species. We note that little surface texture variation has been explicitly documented among stem ants thus far.


This taxon was described from Burmese amber, Kachin State, Myanmar (Early Cenomanian, Late Cretaceous).



The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • rugosa. †Sphecomyrmodes rugosus Barden & Grimaldi, 2014: 15, fig. 6A-C (w.) BURMESE AMBER (Myanmar, Cretaceous).
    • Combination in †Gerontoformica: Barden & Grimaldi, 2016: in supplemental information (not paginated).
    • Status as species: Barden, 2017: 3.
    • Nomen dubium: Boudinot, Richter, Katzke, et al. 2022: 9.