Camponotini

Forel, 1878

Camponotine Ants

Genus Guides

Camponotus(Carpenter ants)
Colobopsis(Gate-keeper Ants)

Camponotini is a -rich tribe of ants within the Formicinae, comprising 11 extant and 2 extinct with over 2,500 species. The tribe includes the well-known genus Camponotus (carpenter ants), along with Colobopsis, Polyrhachis, and several smaller genera. Members of this tribe are distinguished by their obligate association with the bacterial endosymbiont Blochmannia, which provides nutritional benefits. The tribe originated in the Eocene approximately 38.4 million years ago, likely in Australasia or the Indomalayan region.

Colobopsis by (c) Jonghyun Park, some rights reserved (CC BY), uploaded by Jonghyun Park. Used under a CC-BY license.

Camponotus absquatulator by (c) April Nobile, some rights reserved (CC BY). Used under a CC-BY license.

Camponotus castaneus by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Camponotini: /ˌkæmpəˈnɒtɪnaɪ/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Camponotini ants are characterized by a single petiolar node (one-segmented waist) and the presence of a metapleural gland. Most lack a sting and instead rely on chemical defense through formic acid ejection from the acidopore. The tribe exhibits considerable size variation, from small Colobopsis to large Dinomyrmex. is pronounced, with major (soldiers) typically possessing disproportionately enlarged for defense and colony tasks.

Images

Distribution

The tribe originated in Australasia or the Indomalayan region during the Eocene. Multiple events have occurred to the Afrotropics, Palearctic region, and New World. Individual show distinct patterns: Overbeckia is restricted to tropical Southeast Asia and Australasia; Lathidris occurs in the mountains of Mesoamerica; Retalimyrma is found in the Indian Himalayas; Uwari occurs in eastern Asia.

Human Relevance

Members of the Camponotus (carpenter ants) are significant structural pests in human dwellings, excavating galleries in wood. The tribe serves as the primary of Ophiocordyceps unilateralis, the 'zombie- fungus' studied for its manipulation of host . Several are common subjects in myrmecological research due to their abundance, ecological importance, and well-studied symbiotic relationships with Blochmannia bacteria.

Similar Taxa

PlagiolepidiniAlso in Formicinae with single petiolar node; distinguished by lack of Blochmannia endosymbiont and different mandibular
FormiciniShares Formicinae membership but typically has different proventricular structure and lacks the derived symbiotic relationships characteristic of Camponotini

More Details

Symbiont Coevolution

Camponotini ants maintain an obligate, vertically transmitted bacterial endosymbiont, Blochmannia, which resides in specialized (bacteriocytes) and provides nutritional benefits, particularly in nitrogen metabolism. Phylogenetic analysis of 97 camponotine shows Blochmannia histories are largely congruent with host , though some early-diverging lineages (especially Lathidris) show evidence of discordance, suggesting possible lability in the early evolution of this .

Phylogenetic Structure

The tribe comprises eight well-supported lineages: three large (Camponotus, Colobopsis, Polyrhachis) and several smaller genera or clusters. Three novel genera were recently described: Lathidris (Mesoamerica), Retalimyrma (Indian Himalayas), and Uwari (eastern Asia), all previously misclassified in Camponotus. Crown ages are estimated at 22.5 Ma for Colobopsis, 18.6 Ma for Camponotus, and 18.5 Ma for Polyrhachis.

Morphological Modularity

Camponotini exhibits -specific morphological modularity. Minor have small and long extremities; major workers possess enlarged heads for defense with short, thick appendages. Extremities show strong correlation in both worker castes. display weaker extremity integration but strong mesosoma- correlation. This modular organization facilitates evolutionary flexibility and caste specialization.