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Abstract Most supergenes discovered so far are young, occurring in one species or a few closely related species. An ancient supergene in the ant genusFormicapresents an unusual opportunity to compare supergene‐associated phenotypes and the factors that influence the persistence of polymorphism in different species. We investigate the genetic architecture of social organization inFormica francoeuri, an ant species native to low‐ and mid‐elevation semiarid regions of southern California, and describe an efficient technique for estimating mode of social organization using population genomic data. Using this technique, we show thatF. francoeuriexhibits polymorphism in colony social organization and that the phenotypic polymorphism is strongly associated with genotypes within theFormicasocial supergene region. The distribution of supergene haplotypes inF. francoeuridiffers from that of related speciesFormica selysiin that colonies with multiple queens contain almost exclusively workers that are heterozygous for alternative supergene haplotypes. Moreover, heterozygous workers exhibit allele‐specific expression of the polygyne‐associated haplotype at the candidate geneKnockout,which is thought to influence social organization. We also report geographic population structure and variation in worker size across a large fraction of the species range. Our results suggest that, although theFormicasupergene is conserved within the genus, the mechanisms that maintain the supergene and its associated polymorphisms differ among species. 

Abstract Our study situates the classic period center Matacanela, located in southern Veracruz, Mexico, within the context of shifting regional political‐economic systems. Specifically, we assess the potential for utilizing neutron activation analysis (NAA) of pottery in the study of changing interactions through a focus on three ceramic wares: Coarse Orange, Fine Orange, and Coarse Brown. NAA identified four compositional groups, suggesting that Matacanela selectively utilized ceramics from a variety of sources, but the center's inhabitants overwhelming used ceramics that were only occasionally exploited by their contemporaries in the nearby Catemaco and Tepango valleys. Instead, the center's primary ceramic exchange partners were in the southern Tuxtlas foothills. This divergent pattern of ceramic exchange parallels earlier obsidian exploitation differences that revealed participation in the networks of the western Tuxtla uplands as well as the southern foothills and centers within eastern Olman. The findings of this study contribute to (1) the geological characterization of ceramic resources used by ancient Gulf lowland societies, (2) to the comparative ceramic database in a region that was an important nexus for diverse cultural traditions spanning Mesoamerican prehistory, and (3) the refinement of our knowledge relevant to the divergent strategies employed by groups.