Camponotus crassus

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Camponotus crassus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Species: C. crassus
Binomial name
Camponotus crassus
Mayr, 1862

Camponotus crassus casent0173406 profile 1.jpg

Camponotus crassus casent0173406 dorsal 1.jpg

Specimen labels


DaRocha et al. (2015) studied the diversity of ants found in bromeliads of a single large tree of Erythrina, a common cocoa shade tree, at an agricultural research center in Ilhéus, Brazil. Forty-seven species of ants were found in 36 of 52 the bromeliads examined. Bromeliads with suspended soil and those that were larger had higher ant diversity. C. crassus was found in 7 different bromeliads but was associated with twigs and bark cavities, rather than suspended soil or litter, of the plants. Fagundes et al. (2010) report it nesting in bamboo.



Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil (type locality), Paraguay, Trinidad and Tobago.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Sanz-Veiga et al. (2017) - This species was observed visiting the extrafloral nectaries of Tocoyena formosa plants occurring in a southeastern Brazilian cerrado study-site.

C. crassus visiting a nectary

Lange et al. (2015) - This species was found in semideciduous mesophytic forest pitfall-trap samples. The study examined the ant community within a patch (11.2 hectares) of forest in an urban park (Araguari, Brazil).

Association with Other Organisms

This species is a host for the strepsipteran Stichotrema beckeri (a parasite) (Cook, 2019).




The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • crassus. Camponotus crassus Mayr, 1862: 670 (w.) BRAZIL. Forel, 1912i: 78 (q.); Mariano et al., 2001: 272 (k.). Combination in C. (Myrmobrachys): Forel, 1914a: 270. Subspecies of senex: Forel, 1879a: 99. Revived status as species: Dalla Torre, 1893: 227; Emery, 1906c: 192. Senior synonym of flexus: Mayr, 1870a: 387; of picticornis, vezenyii: Wild, 2007b: 47. Current subspecies: nominal plus amazonicus, delabiatus.
  • flexus. Camponotus flexus Mayr, 1862: 671 (w.) BRAZIL. Junior synonym of crassus: Mayr, 1870a: 387.
  • vezenyii. Camponotus vezenyii Forel, 1907a: 34 (w.) PARAGUAY. Combination in C. (Myrmobrachys): Forel, 1914a: 271. Subspecies of crassus: Forel, 1911e: 291. Revived status as species: Emery, 1920b: 260; Kempf, 1972a: 54. Junior synonym of crassus: Wild, 2007b: 47.
  • picticornis. Camponotus (Myrmobrachys) crassus var. picticornis Santschi, 1936d: 421 (w.) ARGENTINA. Junior synonym of crassus: Wild, 2007b: 47.



  • n = 10, 2n = 20, karyotype = 20M (Brazil) (Aguiar et al., 2016; Mariano et al., 2001).


  • Cook, J.L. 2019. Annotated catalog of the order Strepsiptera of the world. Transactions of the American Entomological Society 144: 121-267 (doi:10.3157/061.145.0202).
  • Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 227, revived status as species)
  • DaRocha, W. D., S. P. Ribeiro, F. S. Neves, G. W. Fernandes, M. Leponce, and J. H. C. Delabie. 2015. How does bromeliad distribution structure the arboreal ant assemblage (Hymenoptera: Formicidae) on a single tree in a Brazilian Atlantic forest agroecosystem? Myrmecological News. 21:83-92.
  • Emery, C. 1906c [1905]. Studi sulle formiche della fauna neotropica. XXVI. Bull. Soc. Entomol. Ital. 37: 107-194 (page 192, revived status as species)
  • Fagundes, R., Terra, G., Ribeiro, S.R., Majer, J.D. 2010. O bambu Merostachys fischeriana (Bambusoideae: Bambuseae) como habitat para formigas de floresta tropical montana. Neotropical Entomology 39(6):906-911.
  • Forel, A. 1879a. Études myrmécologiques en 1879 (deuxième partie [1re partie en 1878]). Bull. Soc. Vaudoise Sci. Nat. 16: 53-128 (page 99, race of senex)
  • Forel, A. 1912j. Formicides néotropiques. Part VI. 5me sous-famille Camponotinae Forel. Mém. Soc. Entomol. Belg. 20: 59-92 (page 78, queen described)
  • Forel, A. 1914a. Le genre Camponotus Mayr et les genres voisins. Rev. Suisse Zool. 22: 257-276 (page 270, combination in C. (Myrmobrachys))
  • Lange, D., A. A. Vilela, G. Erdogmus, A. B. Barbosa, S. C. Costa, and V. Stefani. 2015. Temporal dynamic of foraging of epigeic ants in an urban forest fragment. Bioscience Journal. 31:1501-1511.
  • Mayr, G. 1862. Myrmecologische Studien. Verh. K-K. Zool.-Bot. Ges. Wien 12: 649-776 (page 670, worker described)
  • Mayr, G. 1870a. Formicidae novogranadenses. Sitzungsber. Kais. Akad. Wiss. Wien Math.-Naturwiss. Cl. Abt. I 61: 370-417 (page 387, senior synonym of flexus)
  • Sanz-Veiga, P. A., L. R. Jorge, S. Benitez-Vieyra, and F. W. Amorim. 2017. Pericarpial nectary-visiting ants do not provide fruit protection against pre-dispersal seed predators regardless of ant species composition and resource availability. PLoS ONE. 12. doi:10.1371/journal.pone.0188445