Adaptive Radiation in Socially Advanced Stem-Group Ants from the Cretaceous Author Phillip Barden Author David A. Grimaldi text Current Biology 2016 26 515 521 journal article http://dx.doi.org/10.1016/j.cub.2015.12.060 4f330383-51a0-4406-bec4-9a9fc6d33f8d 269536 7F08DE99-7838-40CB-BD40-8123E8C5AC94 Gerontoformica Nel & Perrault Gerontoformica Nel & Perrault, 2004 : pg. 24 . Type species: G. cretacica Nel & Perrault , by original designation. In Late Albian-aged amber from Charente-Maritime, France . Sphecomyrmodes Grimaldi & Engel, 2005 : pg. 5 . Type species Sphecomyrmodes orientalis , by original designation. In Burmese amber dated to the Albian-Cenomanian boundary (ca. 99 Ma). NEW SYNONYMY . Diagnosis (emended): Distinguished from other Cretaceous genera by the presence of an uninterrupted row of peglike denticles on the anterior margin of the clypeus; mandibles falcate, with one large apical tooth and one preapical tooth; labrum without denticles. The revised diagnosis and new generic synonymy are based on re-examination by one author (P.B.) of the type specimen, housed at the National Museum of Natural History, Paris. The original description of G. cretacica reports peg-like teeth on the labrum, which actually occur on the clypeus [S 20 ]. Also, the antenna is distorted, giving the false appearance of an elongate scape. Finally, the apparent lack of a sting in the type specimen can be attributed to preservation, as other major features (dorsal mesosomal sclerites) are missing. Species formerly placed in Sphecomyrmodes [S 12 ,S 16 ,S 17 ] are now placed in Gerontoformica , as follows: