Philip S. Ward, Brian L. Fisher, Jennifer J. Wernegreen, Bonnie B. Blaimer
{"title":"Evolutionary history, novel lineages and symbiont coevolution in the ant tribe Camponotini (Hymenoptera: Formicidae)","authors":"Philip S. Ward, Brian L. Fisher, Jennifer J. Wernegreen, Bonnie B. Blaimer","doi":"10.1111/syen.12678","DOIUrl":null,"url":null,"abstract":"<p>Many insect groups have acquired obligate microbial symbionts, and the resulting associations can have important ecological and evolutionary consequences. A notable example among ants is the species-rich tribe Camponotini, whose members derive nutritional benefits from a vertically inherited bacterial endosymbiont, <i>Blochmannia</i>. We generate ultraconserved element (UCE) phylogenomic data for 220 ingroup and 5 outgroup taxa to reconstruct a detailed evolutionary history of the Camponotini, including the inference of divergence times and dispersal events. Under multiple modes of analysis, including both concatenation and species-tree approaches, we recover a well-supported backbone phylogeny comprising eight lineages: three large genera (<i>Camponotus</i>, <i>Colobopsis</i>, <i>Polyrhachis</i>) and several smaller genera or clusters of genera. Three novel lineages are uncovered that cannot be placed in any existing genus: <i>Lathidris</i> <b>gen. n</b>., from the mountains of Mesoamerica; <i>Retalimyrma</i> <b>gen. n</b>., from the Indian Himalayas; and <i>Uwari</i> <b>gen. n</b>., from eastern Asia. The species in these new genera were described and placed erroneously in <i>Camponotus</i>. The tribe Camponotini is estimated to have a crown origin in the Eocene (median age 38.4 Ma), with successively younger crown ages for <i>Colobopsis</i> (22.5 Ma), <i>Camponotus</i> (18.6 Ma) and <i>Polyrhachis</i> (18.5 Ma). We infer an Australasian or Indomalayan origin for the tribe, with multiple dispersal events to the Afrotropics, Palearctic region, and New World. Phylogenetic analysis of selected <i>Blochmannia</i> genes from a subset of 97 camponotine taxa yields results that are largely congruent with the ant host phylogeny, at least for well-supported nodes, but we find evidence that <i>Blochmannia</i> from some old lineages—especially <i>Lathidris</i>—may have discordant histories, suggesting possible lability of this symbiosis in the early evolution of camponotine ants.</p>","PeriodicalId":22126,"journal":{"name":"Systematic Entomology","volume":"50 3","pages":"646-676"},"PeriodicalIF":4.9000,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/syen.12678","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Systematic Entomology","FirstCategoryId":"97","ListUrlMain":"https://resjournals.onlinelibrary.wiley.com/doi/10.1111/syen.12678","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENTOMOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Many insect groups have acquired obligate microbial symbionts, and the resulting associations can have important ecological and evolutionary consequences. A notable example among ants is the species-rich tribe Camponotini, whose members derive nutritional benefits from a vertically inherited bacterial endosymbiont, Blochmannia. We generate ultraconserved element (UCE) phylogenomic data for 220 ingroup and 5 outgroup taxa to reconstruct a detailed evolutionary history of the Camponotini, including the inference of divergence times and dispersal events. Under multiple modes of analysis, including both concatenation and species-tree approaches, we recover a well-supported backbone phylogeny comprising eight lineages: three large genera (Camponotus, Colobopsis, Polyrhachis) and several smaller genera or clusters of genera. Three novel lineages are uncovered that cannot be placed in any existing genus: Lathidrisgen. n., from the mountains of Mesoamerica; Retalimyrmagen. n., from the Indian Himalayas; and Uwarigen. n., from eastern Asia. The species in these new genera were described and placed erroneously in Camponotus. The tribe Camponotini is estimated to have a crown origin in the Eocene (median age 38.4 Ma), with successively younger crown ages for Colobopsis (22.5 Ma), Camponotus (18.6 Ma) and Polyrhachis (18.5 Ma). We infer an Australasian or Indomalayan origin for the tribe, with multiple dispersal events to the Afrotropics, Palearctic region, and New World. Phylogenetic analysis of selected Blochmannia genes from a subset of 97 camponotine taxa yields results that are largely congruent with the ant host phylogeny, at least for well-supported nodes, but we find evidence that Blochmannia from some old lineages—especially Lathidris—may have discordant histories, suggesting possible lability of this symbiosis in the early evolution of camponotine ants.
期刊介绍:
Systematic Entomology publishes original papers on insect systematics, phylogenetics and integrative taxonomy, with a preference for general interest papers of broad biological, evolutionary or zoogeographical relevance.