Paraponera clavata

Paraponera clavata is a species of ant, commonly known as the bullet ant, named for its extremely potent sting. It inhabits humid lowland rainforests from Nicaragua and the extreme east of Honduras and south to Paraguay.

Paraponera clavata
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hymenoptera
Family:
Formicidae
Subfamily:
Paraponerinae
Tribe:
Paraponerini
Genus:
Paraponera
Species:
P. clavata
Binomial name
Paraponera clavata
(Fabricius, 1775)
Synonyms

Paraponera aculeata (Olivier, 1792)
Paraponera tarsalis (Perty, 1833)

Etymology

The specific epithet of the ant, clavata, means "club-shaped".[1] The generic name, Paraponera, translates to "near-Ponera".[2] Due to its notoriety, the ant has several Native American, Spanish, and Portuguese local names in different geographical areas. Perhaps the best known name is the Venezuelan hormiga veinticuatro (the "24 ant" or "24-hour ant"), referring to the full day of pain that follows being stung; it can also refer to the time it takes to kill a human.[3][4][5] In Brazil, the Portuguese names given by locals include formiga cabo verde, formigão, or formigão-preto (big black ant), and Native American-derived names are tocandera, tocandira, and tocanquibira. These names derive from the Tupi–Guarani tuca-ndy, which translates to "the one wounding deeply".[5] Other names by which it is referred include chacha, cumanagata, munuri, siámña, yolosa, and viente cuatro hora hormiga.[6] In Costa Rica, P. clavata is known as bala, meaning "bullet".[7] P. clavata also has several common names; it is most commonly known as the bullet ant because of the extreme pain it delivers following a sting, similar to that of getting shot.[8][9] Other names are the lesser giant hunting ant and conga ant.[10]

Taxonomy
P. dieteri (pictured) is the only known species that is closely related to Paraponera clavata.

Paraponera clavata was first described by Danish zoologist Johan Christian Fabricius in 1775, who named it Formica clavata in his Systema entomologiae, based on a worker he collected. Fabricius incorrectly listed the type locality as India, as these ants are only found in Central and South America.[11] In 1804, P. clavata was transferred to the genus Ponera by the French zoologist Pierre André Latreille.[12] The genus Paraponera was established by the British entomologist Frederick Smith in 1858, and P. clavata was designated as the type species by monotypy (the condition of a taxonomic group having only a single taxon described).[13] In his book, Smith would synonymise multiple taxa under Paraponera clavata, including Formica armata, Formica spininoda, Ponera tarsalis and Ponera clavata. Later publications would also synonymise more taxa, including Formica aculeata and Formica clavata.[14][15] The genus was placed in a monotypic tribe, the Paraponerini, in 1901 by the Italian entomologist Carlo Emery, who stressed the importance of certain morphological characteristics of Paraponera; Emery had also placed the tribe close to the Ectatommini.[16] This classification was accepted by the entomological community until 1958, where the American entomologist William Brown Jr. synonymised Paraponerini and transferred Paraponera to Ectatommini.[17] It was treated as a valid tribe in 1994, but in 2003, the English myrmecologist elevated the rank of the tribe to subfamily level as Paraponerinae, being a part of the Poneromorph subfamilies.[18][19]

Under the present classification, the bullet ant is a member of the genus Paraponera in the tribe Paraponerini, subfamily Paraponerinae. It is a member of the family Formicidae, belonging to the order Hymenoptera,[20] It was once the sole member of its own genus and tribe until the extinct Paraponera dieteri was described in 1994 by the entomologist Cesare Baroni Urbani.[5] The ant, described from Dominican amber, existed during the Early Miocene 15 to 45 million years ago. P. dieteri can be distinguished from P. clavata by its much narrower head, length, pronotum width, petiole width and other features. The good preservation of the fossil allowed comprehensive comparisons between the two species; the body sculpture of P. dieteri suggests that the genus as a whole exhibits a slow evolutionary rate.[5]

P. clavata is the only living species in its subfamily. Although P. dieteri was the first extinct relative of P. clavata to be described, another Paraponera fossil had been examined earlier in the 1980s. The fossil, which was from the Miocene, was found embedded in Dominican Amber from Hispaniola; at the time of discovery, the ant was the largest fossil of its kind. It showed similar characteristics to P. clavata, although it was considerably smaller. The fossil also has biogeographic importance. As P. clavata is not found in the Greater Antilles, but rather in Central and South America, this suggests that moister tropical forests covered the island during the Tertiary period. This is further supported by the fact that P. clavata is a forest ant that forages on the ground and up into bushes and trees.[21]

Description

Worker ants are 18–30 mm (0.7–1.2 in) long[22] and resemble stout, reddish-black, wingless wasps. Paraponera is predatory, and like all primitive poneromorphs, does not display polymorphism in the worker caste; the queen ant is not much larger than the workers.[23] They are not aggressive ants but are vicious when defending the nest, when they produce a stridulating sound and sting with ferocity.[24]

Paraponera clavata – museum specimen
Photograph demonstrating the size of bullet ants, with a 2-cm scale bar

Distribution and habitat

Paraponera is distributed throughout Central and South America, commonly found in the wet neotropic ecozone. These ants are found in Honduras, El Salvador, Nicaragua and Costa Rica from the north, and in Venezuela, Colombia, Ecuador, Peru, Bolivia and Brazil from the south.[25] Colonies are found in lowland areas, at elevations ranging from sea level to 750 m (2,460 ft). However, specimens have been collected at elevations of 1,500 m (4,920 ft) in Parque La Amistad.[26]

Colonies consist of several hundred individuals and are usually situated at the bases of trees. Workers forage arboreally in the area directly above the nest for small arthropods and nectar, often as far as the upper canopy; little foraging occurs on the forest floor. Nectar, carried between the mandibles, is the most common food taken back to the nest by foragers. Two studies in Costa Rica and on Barro Colorado Island (BCI) found about four bullet ant nests per hectare of forest. On BCI, the nests were found under 70 species of trees, six species of shrubs, two species of lianas, and one species of palm. Nests were most common beneath the canopies of Faramea occidentalis and Trichilia tuberculata, but these trees are also the most abundant in the forest. Nests were present more frequently than would be expected based on the abundance of the trees under Alseis blackiana, Tabernaemontana arborea, Virola sebifera, Guarea guidonia, and Oenocarpus mapora. The large number of nest plants suggests little active selection of nest sites by bullet ants. Small shrubs, however, are underused, probably because they do not provide access to the forest canopy. The study on BCI concluded trees with buttresses and extrafloral nectaries may be selected for by bullet ants.[27]

Enemies

This ant is a predator of Greta oto, the glasswing butterfly. This butterfly attempts to combat P. clavata by producing chemical extracts during the larval stage that are unpalatable to these ants.

Parasites

The small (1.5- to 2.0-mm-long) phorid fly, Apocephalus paraponerae, is a parasite of injured workers of P. clavata, of which the supply is constant because frequent aggressive encounters occur between neighbouring colonies, resulting in maimed workers. The flies are able to parasitise healthy ants if the ants are artificially restrained, but healthy ants are agile and able to repel them. Both male and female flies are attracted by the scent of injured ants; the females lay eggs, as well as feed, and the males feed and possibly mate with the females. The flies are attracted to a crushed ant within two to three minutes and 10 or more flies may be attracted to each ant. Each ant can harbour 20 fly larvae. Carl Rettenmeyer observed P. clavata actively trying to attack A. paraponerae when they approached the entrance to their nest.[22][28]

Relationship with humans

Sting

The bullet ant's sting is currently the highest on Schmidt's sting pain index, at 4.0+. Some victims compared the pain to that of being shot, hence the name of the insect. It is described as causing "waves of burning, throbbing, all-consuming pain that continues unabated for up to 24 hours".[3] Lymphadenopathy, edema, tachycardia and fresh blood appearing in human victim feces are common symptoms.[24] Poneratoxin, a paralyzing neurotoxic peptide isolated from the venom, affects voltage-dependent sodium ion channels and blocks the synaptic transmission in the central nervous system. It is being investigated for possible medical applications.[9][29]

Initiation rites

The Sateré-Mawé people of Brazil use intentional bullet ant stings as part of their initiation rites to become warriors.[30] The ants are first rendered unconscious by submerging them in a natural sedative, and then 80 of them are woven into gloves made of leaves (which resembles a large oven mitt), stingers facing inward. When the ants regain consciousness, a boy slips the gloves onto his hands. The goal of this initiation rite is to keep the glove on for five minutes. When finished, the boy's hand and part of his arm are temporarily paralyzed because of the ant venom, and he may shake uncontrollably for days. The only "protection" provided is a coating of charcoal on the hands, supposedly to confuse the ants and inhibit their stinging. To fully complete the initiation, however, the boys must go through the ordeal 20 times over the course of several months or even years.[31]

See also
  • Myrmecia, often called bull ants, also renowned for their powerful sting
  • List of ant genera (alphabetical)

References
  1. "Clavata". Biology Online Dictionary. Retrieved 8 October 2016.
  2. Wheeler, G.C. (1956). Myrmecological Orthoepy and Onomatology (PDF). University of North Dakota Press. pp. 4, 17. ASIN B0006AUS92.
  3. "The Word:Sting pain index". New Scientist. Vol. 2617. 2007. p. 44.(subscription required)
  4. Capinera, J.L. (2008). Encyclopedia of Entomology (2nd ed.). Dordrecht: Springer. p. 615. ISBN 978-1-4020-6242-1.
  5. Baroni Urbani, C. (1994). "The identity of the Dominican Paraponera. (Amber Collection Stuttgart: Hymenoptera, Formicidae. V: Ponerinae, partim.)" (PDF). Stuttgarter Beiträge zur Naturkunde. 197: 1–9. doi:10.5281/zenodo.26804.
  6. Schmidt, J.O. (2016). The Sting of the Wild. Baltimore: Johns Hopkins University Press. p. 179. ISBN 978-1-4214-1928-2.
  7. Henderson, C.L. (2010). Butterflies, Moths, and Other Invertebrates of Costa Rica: A Field Guide. 65. Austin: University of Texas Press. p. 137. ISBN 978-0-292-77943-3.
  8. Gough, Z. (13 March 2015). "The World's Most Painful Insect Sting". BBC Earth. Retrieved 8 October 2016.
  9. Gerritsen, V.B. (2001). "Princess Bala's sting" (PDF). Protein Spotlight (14): 1–2. ISSN 1424-4721.
  10. Hogue, C.L. (1993). Latin American Insects and Entomology. University of California Press. p. 439. ISBN 978-0-520-07849-9.
  11. Fabricius, J.C. (1775). Systema Entomologiae, Sistens Insectorum Classes, Ordines, Genera, Species, Adiectis Synonymis, Locis, Descriptionibus, Observationibus. Flensburgi et Lipsiae: Libraria Kortii. p. 395.
  12. Latreille, P.A. (1804). "Tableau méthodique des insectes. Classe huitième. Insectes, Insecta" (PDF). Nouveau Dictionnaire d'Histoire Naturelle. 24: 129–200.
  13. Smith, F. (1858). Catalogue of hymenopterous insects in the collection of the British Museum part VI. Formicidae (PDF). London: British Museum. p. 100.
  14. G., Mayr (1863). "Formicidarum index synonymicus" (PDF). Verhandlungen der Zoologisch-Botanischen Gesellschaft in Wien. 13: 385–460. doi:10.5281/zenodo.25913.
  15. Emery, C. (1911). "Hymenoptera. Fam. Formicidae. Subfam. Ponerinae" (PDF). Genera Insectorum. 118: 1–125.
  16. Emery, C. (1901). "Notes sur les sous-familles des dorylines et ponérines (famille des Formicides)" (PDF). Annales de la Société Entomologique de Belgique. 45: 32–54. doi:10.5281/zenodo.25489.
  17. Brown, W.L. (1958). "Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera)". Bulletin of the Museum of Comparative Zoology. 118: 175–362. doi:10.5281/zenodo.26958.
  18. Lattke, J.E. (1994). "Phylogenetic relationships and classification of ectatommine ants (Hymenoptera: Formicidae)". Insect Systematics & Evolution. 25 (1): 105–119. doi:10.1163/187631294X00063.
  19. Bolton, B. (2003). "Synopsis and classification of Formicidae" (PDF). Memoirs of the American Entomological Institute. 71: 1–370.
  20. Bolton, B. (2016). "Paraponera clavata". AntCat. Retrieved 8 October 2016.
  21. Wilson, E.O. (1985). "Ants of the Dominican amber (Hymenoptera: Formicidae) 4. A giant ponerine in the genus Paraponera" (PDF). Israel Journal of Entomology. 19: 197–200.
  22. Brown, B. V.; Feener, D. H. (1991). "Behavior and Host Location Cues of Apocephalus paraponerae (Diptera: Phoridae), a Parasitoid of the Giant Tropical Ant, Paraponera clavata (Hymenoptera: Formicidae)". Biotropica. 23 (2): 182–187. doi:10.2307/2388304. JSTOR 2388304.
  23. Morgan, Randy C. "Giant Tropical Bullet Ant, Paraponera clavata, Natural History and Captive Management". Sonoran Arthropod Studies Institute. Archived from the original on March 23, 2009. Retrieved June 10, 2014.
  24. Haddad, Vidal (2005). "Description of an injury in a human caused by a false tocandira (Dinoponera gigantea, Perty, 1833) with a revision on folkloric, pharmacological and clinical aspects of the giant ants of the genera Paraponera and Dinoponera (sub-family Ponerinae)". SciELO. 47 (4). ISSN 1678-9946.
  25. AntWeb. "Species: Paraponera clavata (Fabricius, 1775)". The California Academy of Sciences. Retrieved 2 September 2015.
  26. Murphy, CM; Breed, MD (2007). "A predictive distribution map for the giant tropical ant, Paraponera clavata". Journal of Insect Science. 7 (8): 1–10. doi:10.1673/031.007.0801. PMC 2999403. PMID 20334591.
  27. Belk, M. C.; Black, H. L.; Jorgensen, C. D.; Hubbell, S. P.; Foster, R. B. (1989). "Nest Tree Selectivity by the Tropical Ant, Paraponera clavata". Biotropica. 21 (2): 173–177. doi:10.2307/2388707. JSTOR 2388707.
  28. Shellee Morehead; Jon Seger; Don Feener; Brian Brown. "A cryptic species complex in the ant parasitoid Apocephalus paraponerae (Diptera: Phoridae)". Archived from the original on 2010-04-07.
  29. Szolajska, Ewa (June 2004). "Poneratoxin, a neurotoxin from ant venom: Structure and expression in insect cells and construction of a bio-insecticide". European Journal of Biochemistry. 271 (11): 2127–36. doi:10.1111/j.1432-1033.2004.04128.x. PMID 15153103.
  30. Backshall, Steve (6 January 2008). "Bitten by the Amazon". The Sunday Times. London. Retrieved 13 July 2013.
  31. "Initiation With Ants". National Geographic. National Geographic. Retrieved 13 February 2014. Video of initiation rite by National Geographic, showing preparation of glove and its use.

Further reading
  • Bequaert, J.C. (1926). Medical Report of the Hamilton Rice 7th. Expedition to the Amazon. Harvard University Press. pp. 250–253.
  • Weber, N. A. (1939). "The sting of the ant, Paraponera clavata". Science. 89 (2302): 127–128. doi:10.1126/science.89.2302.127-a. PMID 17781198.
  • Lattke, JE (2003) - Subfamilia Ponerinae in Introducción a las Hormigas de la Région Neotropical - Von Humboldt Institute, Bogota, Colombia.
  • Breed, M. D.; Bennett, B. (1985). "Mass recruitment to nectar sources in Paraponera clavata: A field study". Insectes Sociaux. 32 (2): 198. doi:10.1007/BF02224233.

Jandt, Jennifer; Larson, Hannah; Tellez, Peter; McGlynn, Terrence (December 2013). "To drink or grasp? How bullet ants (Paraponera clavata) differentiate between sugars and proteins in liquids". Naturwissenschaften. 100 (12): 1109–14. doi:10.1007/s00114-013-1109-3. PMID 24193251.

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