A wood ant, which is one of a number of Palearctic Formica species that build complexes of large mound nests, have large numbers of workers and collect honeydew.
|At a Glance||• Polygynous • Supercolonies • Diploid male|
- 1 Photo Gallery
- 2 Identification
- 3 Distribution
- 4 Biology
- 5 Castes
- 6 Nomenclature
- 7 References
- 8 References based on Global Ant Biodiversity Informatics
Erect hairs on head and mesosoma very sparse and short or absent, except on posterior margins of mesopleura. Gula hairs, if present, are restricted to one or two very weak hairs. Microsculpture is usually slightly coarser than in F. rufa but punctures and micropunctures are widely spaced as in that species. Length: 4.0-8.5 mm (Collingwood 1979).
Keys including this Species
Spain to Siberia, Italian Alps to latitude 60º in Sweden (Collingwood 1979).
Distribution based on Regional Taxon Lists
Oriental Region: India.
Palaearctic Region: Albania, Andorra, Austria, Belarus, Belgium, Bulgaria, China, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany (type locality), Greece, Hungary, Iberian Peninsula, Italy, Kazakhstan, Latvia, Lithuania, Luxembourg, Montenegro, Netherlands, Norway, Poland, Republic of Moldova, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine.
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
Collingwood (1979) - This is accepted as a good species by most European authors, eg. Betrem (1960), Dlussky (1967), Kutter (1977). Some samples of Formica rufa tend to approach the hairless condition of F. polyctena however, making certain determination sometimes difficult. Elton (priv. communication) found that F. polyctena in its most typical form readily accepted fertile queens and pupae from other distant nests of the same species but were always antagonistic to and rejected such from both polygonous and monogynous colonies of F. rufa. This is usually found in a group of nests and always has many queens, sometimes up to 1,000 or more.
This is a relatively well studied species and one that had long confounded myrmecologists in regards to its specific taxonomic identity. Collingwood's statements above are indicative of these problems. What follows is a more recent summary that provides insight into our latest understanding of this ant. This is taken from Siefert et al (2011). The details for the cited works are given in the original publication.
The wood ant species Formica polyctena and Formica rufa are important elements of temperate forest ecosystems of the West Palaearctic. They are considered to give protection against a number of pest insects in natural and secondary, managed forests (reviewed by Otto 1967) and are a symbol and main target of nature conservation in many countries of Europe. Yarrow (1955) and Betrem (1960) considered F. polyctena and F. rufa as clearly different species and this view had been generally adopted for 35 years. The situation changed when Seifert (1991) published a comprehensive study on external morphology and biological parameters of 430 nests collected in different regions of Central, East and North Europe. In addition to the typical F. polyctena and F. rufa, he found a third entity which was intermediate in each investigated phenotypic or biological character: body size, eight size-corrected pilosity characters, monogyny frequency, size of nest populations, diameter of nest mounds and infestation rate with epizootic fungi. He concluded that the third entity was a fertile hybrid between F. polyctena and F. rufa.
Formica polyctena collect large quantities of honeydew.
Novgorodova (2015b) investigated ant-aphid interactions of a dozen honeydew collecting ant species in Western Siberia pine and aspen-birch-pine forests (54°7´N, 83°06´E, 200 m, Novosibirsk) and mixed-grass-cereal steppes with aspen-birch groves (53°44´N, 78°02´E, 110 m, near Karasuk) in the Novosibirsk Region and coniferous forests in the northeastern Altai (north end of Lake Teletskoe, 51°48´N, 87°17´E, 434 m). All of the ants studied had workers that showed high fidelity to attending particular aphid colonies, i.e, individual ants tend to return to the same location, and group of aphids, every time they leave the nest. F. polyctena's honeydew collecting activities were highly coordinated during the summer months when the aphids and ants were most active. Individual foragers specialized on specific tasks and could be classified as shepherds (collect honeydew), guards (protect aphids from competitors), scouts (search for new aphid colonies) and transporters (transport honeydew to the nest). Individuals performed the same type of work day after day, with groups of the same workers, thereby forming teams. In cooler months when aphids were still active foragers were less specialized: some ants were "on duty" (constantly present in a particular aphid colony, collecting honeydew and /or protecting aphids from various competitors) and others that showed no specialization. F. polyctena tended: Symydobius oblongus (Heyden), Chaitophorus populeti (Panzer), Aphis jacobaeae Schrank and A. grossulariae Kaltenbach.
Formica polyctena often forms huge supercolonies with several hundred nests. Nests can be vary large, particularly in coniferous forests.
Rybnikova and Kuznetsov (2015) studied nest complexes of wood ants in the Darwin Nature Reserve (Rybinsk Reservoir basin, Vologda and Yaroslavl Provinces, Russia). Their work assessed, in part, how wild boars and seasonal flooding may influence the survival and viability of wood ant colonies.
A complex of raised and transitional sphagnum bogs is developed in the central part of the peninsula. The better drained areas near the shores are occupied by a strip of upland forests from 1 to 5 km wide, mostly represented by green moss, tall moss, and complex pine forests blending into sphagnum pine forests closer to the bogs. Small patches of lichen pine forests are present in the raised areas. The biotic complex of the reserve is affected by the water level fluctuations in the reservoir, due to which its vast shallow peripheral areas are annually flooded and exposed. However, the water level not only changes seasonally within one year but also varies from year to year, so that high-water and low-water years occur. The destruction of mature ant nests by boars leads to complete elimination of many colonies and stimulates fragmentation of the surviving colonies in spring. The results of exogenous fragmentation of the damaged nests include a decrease in the number of large nests, loss of their growth potentials, depopulation, and degradation. Regular and largescale destruction of ant nests by boars leads to rapid degradation and dying off of whole nest complexes (Dyachenko, 1999; Efremov, 2013).
Observations of the ants have been carried out since 1997. The parameters recorded were the number of inhabited nests in the complexes (n), the basal diameter of the nest dome (d), and the diameter of the nest mound (D).
The Eastern complex (Formica polyctena) is located in a maturing green moss pine forest with admixture of spruce and birch in the first layer, the second layer of spruce, and undergrowth of rowan and juniper. In 2001–2004, the complex comprised 30 nests with the mean basal diameter of 130 ± 38 cm and the mean dome height of 45 ± 16 cm. In 2005, the number of nests started to decline, and only 15 nests remained by 2010. The mean dome base diameter decreased nearly twofold, to 70 ± 31 cm, but the dome height was only insignificantly reduced, to 30 ± 16 cm.
The Southern complex (Formica polyctena) is located in a maturing green moss pine forest. In 1997 the complex included 11 inhabited nests, and in 2004, of 14 nests. The largest nest was fragmented after being destroyed by a wild boar in the winter of 1995, and in 1997 it consisted of three domes on a common mound. It also gave rise to several secondary nests which were built inside an area fenced off with mesh. These nests were never destroyed by boars; they are still quite viable and have distinctly conical domes. The size of the three fenced-off nests practically did not change since 1997. The mean basal diameter (d) of all the nests of the complex only slightly changed since the end of the 1990s: it was 150 ± 40 cm (n = 14) in 1998 and 135 ± 50 cm (n = 8) in 2010. At the same time, the dome height (h) decreased almost twofold, from 85 ± 28 cm (n = 14) in 1998 to 45 ± 40 cm (n = 8) in 2010, due to annual destruction of most nests by wild boars.
Silon Island is a tall ridge of glacial origin. The ant communities of the island were studied in the late 1990s (Rybnikova and Kuznetsov, 1998). The greatest part of the island is occupied by a lichen pine forest which provides little food for red wood ants; therefore, foraging mostly takes place in the riparian zone.
The complex of Silon Island—South. A small complex of F. polyctena exists under the above conditions in the southern part of the island. In 1997, the complex included 18 inhabited nests, which were large, conical, and connected with distinct trails. Some of them reached 70 cm in height (h) and 150–200 cm in dome diameter (d). All the nests were positioned along the shore. The foraging trails extended into the temporary inundation zone, where at a low water level the abundant periaquatic vegetation supported numerous aphid colonies. Since 2003 until now, the water level in the reservoir has remained high, and periaquatic vegetation has been reduced to a narrow stripe of sedges where ants cannot forage. As a result, only three nests have remained there by 2010, all of them being annually destroyed by bears and, less frequently, by boars. The complex is now declining due to a profound reduction of the trophic resources and repeated nest destruction.
Mabelis (1979a) - 1. In the red wood ant, nest splitting is accompanied by the formation of one or more daughter nests. During this process, which can last a week, a month or even longer, transport of workers, queens and brood from the mother to the daughter nest occurs and often in the opposite direction as well. 2. Transpor t of congeners can occur throughout the season in which the red wood ant is active. 3. Transport between a mother nest and a daughter nest can be the result of: a. a difference in the accessibility of the main source of food, b. an attack by the population of a neighbouring nest and/or c. a change in the condition of the nest itself. The predominant direction in which transport occurs can be interred from the environmental conditions of the nests. 4. For removals, transport occurs in only one direction. Some of the ants transported during a removal were observed to return to the nest from which they had been taken. This prolonged the removal. 5. The number of transporters increased during the removal process. This increase is shown to be ascribable to a considerable extent to the transmission of information; in other words, other ants in the nest are in some way stimulated by the transporters to start to participate in the transport.
Holecová et al. (2016) found Formica polyctena to exhibit higher foraging activity between mid-November and mid-March in Slovakia.
Wood Ant Wars
Mabelis (1979b) - In a dune area near The Hague (The Netherlands) nest populations of Formica polyctena are common. The number of nests was counted over a period of five years. The number of the inhabited nests remained almost constant in this period (ca. 23 nests per 4 ha.). Nest populations of Formica polyctena give rise to new nests by means of nest splitting. In the study area 17 viable daughter nests were established in a period of five years.
This means that nest populations merged and/or died off. Ten mergers were observed in this period (all of them between mother and daughter nests), and seven populations died off. Since there was a surplus of suitable nest sites, the question was raised as to whether the disappearance of populations could be due to intra- specific competition for food or even to intraspecific aggression. To find out whether, and if so how, aggression is related to the food requirements of a population, the aggressive behaviour as well as the food supply of nest populations were investigated.
In the spring, after hibernation, increasing numbers of wood ant workers swarm out from the nest into the surrounding area. Many of them move in the direction of the most important food sources of the preceding year: trees and bushes with many aphids. The observations indicated that the workers can remember throughout the winter period the direction in which major food sources were located in the preceding year. Some of the workers travel farther from the nest, especially on warm days; and consequently the frequency of meetings between workers from neighbouring nests increases. Since new nests usually arise by splitting off from existing nests, neighbouring nests are generally of the same origin. Meetings between their workers can result in voluntary transport or in an aggressive encounter. The longer two nests are isolated from each other, the more the number of transported ants declines and the number of victims increases as the result of meetings. An increasing difference in odour between the populations may be responsible for this pattern. Experiments have shown that, when given a different diet, isolated populations of the same origin behaved more aggressively toward each other the longer the separation had lasted.
Locally, the number of fighting ants can increase rapidly due to storage and transfer of information about the battle: ants can remember the location of the battlefield for a long time, and they can attract the attention of other workers by means of scent substances and conspicuous behaviour. As a result, a war can develop to a point at which thousands of ants are involved.
The casualties (thousands per day) are dragged to the warring nests. A few days later (marked) casualties were found on the dumping ground, i.e. a place situated a few metres from the nest to which remnants of prey and dead ants are brought from the nest. The ant bodies brought from the nest to the dumping ground were found to be about half as heavy as those brought from the battlefield to the nest. The findings showed that the workers in the nest are responsible for the loss in bodyweight; in other words, casualties are consumed in the nest by the workers. The majority of the former are aliens; these function as prey. It is assumed that ants seeking for prey are more easily recruited for a war than aphid milkers, because predators have a weaker route- and task-fidelity than do aphid milkers and are also more aggressive.
Almost all wars break out in early spring, especially on warm days. At night, the number of ants on a war track drops sharply, in contrast to the number on tracks leading to aphid trees, which remains nearly constant. This means that most of the workers involved in a battle during the day stay in the nest during the night. They leave the nest early in the morning and go straight to the battlefield of the preceding day, thus contributing to the heavy traffic observed during a short period in the morning.
Early in a war there is a strong positive correlation between the temperature and the number of casualties. This is explained by the fact that when temper- ature rises, the number of foragers increases as well as their aggressiveness. However, at a certain moment in the spring the effect of temperature on the number of casualties disappears. After that, the daily number of casualties declines and the war comes to an end. At the last, the density of foragers on the now peaceful battlefield becomes so low that we can speak of a "no-man's-land" between the foraging areas of populations.
As a result, the frequency of meetings between workers from neighbouring nests is low at such times, i.e. during the summer. Meetings which do occur lead less often to casualties, because the readiness of workers to attack congeners in the border area between nests is lower than it was early in the spring, and under these con- ditions there is a greater chance of reaching home safely by resorting to fleeing or appeasement behaviour. Nevertheless, ants from different nests are still hostile to each other: when they were lured to the same place (by means of prey items) war- fare revived. However, when this occurs, there are fewer casualties and the duration of the battle is shorter than in the beginning of the year. During the spring and summer each nest has its own territory, i.e. an area around the nest where intruders belonging to neighbouring nests are attacked (Figs. 5 and 6, see back fold).
One of the functions of intraspecific aggression may be defence and enlargement of the territory, to secure as large a food supply as possible for the nest population. Changes in territory size occur mainly during wartime in the spring. Large populations have the advantage here over small ones, because the more workers a population sends into battle, the more bodies the nest will acquire and the greater the chance of enlarging its territory. As a result, large populations generally possess larger territories than small populations do. In autumn, the number of ants in some parts of the border area increases again, but the neighbours are no longer hostile toward each other and the foraging areas of their nests show an overlap. Thus, intraspecific aggression is strongest in the spring, at the start of the reproduction period, when the protein requirement of the nest is high and the prey density in the field is low. The hypo- thesis is put forward that wars occur in periods when the prey requirement is higher than the supply. Experimental evidence supporting this hypothesis was provided by experiments performed in the laboratory: populations given a prey-poor diet became more aggressive after a few weeks than did sister populations which received a prey- rich diet.
Because war casualties are consumed for the benefit of the queens and the growing larvae, the main function of warfare may be the reduction of the risk that maturing larvae will receive too little protein-rich food at times when there is a low prey density. The casualties in a war are workers belonging to the oldest generation. The toll taken by war thus concerns individuals which will die soon anyway, and whose task (i.e.predation) cannot be fulfilled maximally because of lack of prey. Every population sacrifices, as it were, a proportion of its workers in times of food scarcity for the sake of the food supply for the first stages of the new generation, which will finally mature in a time when food is abundant in the field.
There are striking similarities between the behaviour of workers with respect to prey and foreign congeners:
a. descriptively, predatory and aggressive behaviour are similar;
b. for a worker, a prey and a non-nestmate have qualitatively the same value as external stimulus; and
c. the motivations for these two kinds of behaviour cannot be distinguished from each other.
There seem to be no essential differences between predatory and aggressive behaviour. Experimental evidence supporting this hypothesis was obtained by offering prey items to warrior ants. Where a large number of prey items were set out among battling ants on a battlefield, the number of war casualties temporarily decreased, and where prey items were set out on the track to the battlefield at night, the daily resumption of a war could be delayed; the warriors reacted immediately to the prey, which they dragged to the nest. It is therefore concluded that warfare in the red wood ant can be considered a form of mutual predation.
Milar et al. (2017) found in an experimental test, simulating being threatened with entrapment in sand (as might happen if falling in an ant lion pit or if subjected to a collapse of a ground nest), that this species did exhibit rescue behaviour. This was in agreement with their hypothesis that species that could face entrapment situations would show such a response. Formica polyctena occur in forest situations. While they have not evolved with ant lion predation they do face possible dangers from being stuck in clay, organic debris or plant secretions. Milar et al. suggested this species had developed a general rescue cue and response that applied even when threatened with an ant lion, which was a novel threat.
Associations with other Organisms
Zingg et al. (2018) found that F. polyctena were negatively correlated with the abundance of ticks in a field study conducted in the forests of the Jura Mountains, northwestern Switzerland. They examined the abundance of nymph and adult ticks in paired sites with and without F. polycenta. They found: the presence of red wood ants was negatively associated with the number of questing Ixodes ticks. Ant nest volume was the most important ant related variable and had a strong negative effect on tick abundance. The mechanisms that drive the negative relationship between wood ants and ticks remain unknown.Possible mechanisms include the repellent effect of ant formic acid, and the predatory behavior of the wood ants.
This taxon is a host for the fungi Aegeritella superficialis (Pascovici, 1983; Espadaler & Santamaria, 2012), Ophiocordyceps myrmecophila (Shrestha et al., 2017) and Pandora myrmecophaga (Csata et al., 2013).
Nielson et al (2018) showed how colonies of this species could be usefully moved into cultivated areas in Denmark to help control pest species.
Life History Traits
- Queen number: polygynous (Rissing and Pollock, 1988; Frumhoff & Ward, 1992)
- Queen type: winged (Rissing and Pollock, 1988; Frumhoff & Ward, 1992) (queen-right worker reproduction)
- Colony type: supercolony
- Mean colony size: 450,000 (Rosengren, 1971; Kruk-de-Bruin et al., 1977; Horstmann, 1982; Beckers et al., 1989)
- Nest site: thatch mound
- Foraging behaviour: trunk trail (Rosengren, 1971; Kruk-de-Bruin et al., 1977; Horstmann, 1982; Beckers et al., 1989)
Diploid males are known to occur in this species (found in 6.9% of 72 examined nests) (Pamilo et al., 1994; Cournault & Aron, 2009).
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- major. Formica major Nylander, 1849: 29 (w.) FINLAND. Junior synonym of rufa: Emery & Forel, 1879: 450. Revived from synonymy: Betrem, 1926: 213. Senior synonym of piniphila: Betrem, 1953: 325. Junior synonym of rufa: Yarrow, 1955a: 3; Betrem, 1960b: 76; Kutter, 1977c: 273; of polyctena: Radchenko, 2007: 37 (major is best regarded as a nomen oblitum, therefore polyctena takes priority).
- polyctena. Formica polyctena Foerster, 1850a: 15 (w.q.m.) GERMANY. Junior synonym of rufa: Nylander, 1856b: 60; Emery & Forel, 1879: 450; Dalla Torre, 1893: 208; Yarrow, 1955a: 3. Subspecies of rufa: Forel, 1915d: 58; Emery, 1925b: 253; Stitz, 1939: 339; Boven, 1947: 189. Status as species: Bondroit, 1917a: 174; Müller, 1923: 144; Betrem, 1926: 212; Betrem, 1960b: 64; Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187; Kutter, 1977c: 272; Collingwood, 1979: 144. Senior synonym of minor: Betrem, 1960b: 64; Dlussky, 1967a: 93; of nuda: Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187; of major: Radchenko, 2007: 37 (major is best regarded as a nomen oblitum, therefore polyctena takes priority). See also: Mabelis, 1979: 451; Gösswald, 1989: 18; Atanassov & Dlussky, 1992: 279; Czechowski & Douwes, 1996: 125.
- nuda. Formica (Formica) rufa var. nuda Karavaiev, 1930b: 148 (w.) SWEDEN. [Unresolved junior primary homonym of nuda Ruzsky, above.] Junior synonym of rufa: Karavaiev, 1936: 240; Yarrow, 1955a: 4; of polyctena: Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187.
- minor. Formica minor Gösswald, 1951: 436 (w.q.) GERMANY. [First available use of Formica rufa subsp. pratensis var. minor Gösswald, 1941: 78; unavailable name.] Junior synonym of polyctena: Betrem, 1960b: 64; Dlussky, 1967a: 93.
- n = 26, 2n = 52 (Finland; Switzerland) (Hauschteck-Jungen & Jungen, 1976; Rosengren et al., 1980).
- Alexandrovna, K.A. 2020. Red wood ants (Formica s. str.) as a method of biological protection in phytocenoses of the Mordovia Republic. In: Vavilov Readings - 2020: a collection of articles of the International Scientific and Practical Conference dedicated to the 100th anniversary of the discovery of the law of homological series and the 133rd anniversary of the birth of Academician NI Vavilov, November 24-25, 2020.
- Atanassov, N.; Dlussky, G. M. 1992. Fauna of Bulgaria. Hymenoptera, Formicidae. Fauna Bûlg. 22: 1-310 (page 279, see also)
- Beckers R., Goss, S., Deneubourg, J.L., Pasteels, J.M. 1989. Colony size, communication and ant foraging Strategy. Psyche 96: 239-256 (doi:10.1155/1989/94279).
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- Betrem, J. G. 1926. De mierenfauna van Meijendel. Levende Nat. 31: 211-220 (page 212, Status as species)
- Betrem, J. G. 1960b. Ueber die Systematik der Formica rufa-gruppe. Tijdschr. Entomol. 103: 51-81 (page 64, Status as species, Senior synonym of minor)
- Bondroit, J. 1917a. Notes sur quelques Formicidae de France (Hym.). Bull. Soc. Entomol. Fr. 1917: 174-177 (page 174, Status as species)
- Boulay, R., Quagebeur, M., Godzinska, E.J., Lenoir, A. 1999. Social isolation in ants: Evidence of its impact on survivorship and behavior in Camponotus fellah (Hymenoptera, Formicidae).
- Boven, J. K. A. van. 1947b. Liste de détermination des principales espèces de fourmis belges (Hymenoptera Formicidae). Bull. Ann. Soc. Entomol. Belg. 83: 163-190 (page 189, Variety/subspecies of rufa)
- Collingwood, C. A. 1979. The Formicidae (Hymenoptera) of Fennoscandia and Denmark. Fauna Entomol. Scand. 8: 1-174 (page 144, Status as species)
- Cournault, L., Aron, S. 2009. Diploid males, diploid sperm production, and triploid females in the ant Tapinoma erraticum. Naturwissenschaften 96: 1393–1400 (doi:10.1007/s00114-009-0590-1).
- Csata, E., Czekes, Z., Eros, K., Nemet, E., Hughes, M., Csosz, S., Marko, B. 2013. Comprehensive survey of Romanian myrmecoparasitic fungi: new species, biology and distribution. North-western Journal of Zoology 9: 23-29.
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- Czechowski, W.; Douwes, P. 1996. Morphometric characteristics of Formica polyctena Foerst. and Formica rufa L. (Hymenoptera, Formicidae) from the Gorce Mts; interspecific and intraspecific variations. Ann. Zool. (Warsaw) 46: 125-141 (page 125, see also)
- Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 208, Junior synonym of rufa)
- Dekoninck, W., Maebe, K., Breyne, P., Hendrickx, F. 2014. Polygyny and strong genetic structuring within an isolated population of the wood ant Formica rufa. Journal of Hymenoptera Research 41, 95–111 (doi:10.3897/jhr.41.8191).
- Dlussky, G. M. 1967a. Ants of the genus Formica (Hymenoptera, Formicidae, g. Formica). Moskva: Nauka Publishing House, 236 pp. (page 93, Status as species, Senior synonym of minor, Senior synonym of nuda)
- Dlussky, G. M.; Pisarski, B. 1971. Rewizja polskich gatunków mrówek (Hymenoptera: Formicidae) z rodzaju Formica L. Fragm. Faun. (Warsaw) 16: 145-224 (page 187, Status as species, Senior synonym of nuda)
- Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 253, Variety/subspecies of rufa)
- Emery, C.; Forel, A. 1879. Catalogue des Formicides d'Europe. Mitt. Schweiz. Entomol. Ges. 5: 441-481 (page 450, Junior synonym of rufa)
- Espadaler, X., Santamaria, S. 2012. Ecto- and Endoparasitic Fungi on Ants from the Holarctic Region. Psyche Article ID 168478, 10 pages (doi:10.1155/2012/168478).
- Foerster, A. 1850a. Hymenopterologische Studien. 1. Formicariae. Aachen: Ernst Ter Meer, 74 pp. (page 15, worker, queen, male described)
- Forel, A. 1915d. Fauna insectorum helvetiae. Hymenoptera. Formicidae. Die Ameisen der Schweiz. Mitt. Schweiz. Entomol. Ges. 12(B Beilage: 1-77 (page 58, Variety/subspecies of rufa)
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- Goropashnaya, Anna V.; Fedorov, Vadim B.; Pamilo, Pekka 2004. Recent speciation in the Formica rufa group ants (Hymenoptera, Formicidae): inference from mitochondrial DNA phylogeny. Molecular Phylogenetics and Evolution 32(1): 198-206 (mtDNA sequence data)
- Gösswald, K. 1989. Die Waldameise. Band 1. Biologische Grundlagen, Ökologie und Verhalten. Wiesbaden: AULA-Verlag, xi + 660 pp. (page 18, see also)
- Haelewaters, D., Boer, P., Noordijk, J. 2015. Studies of Laboulbeniales (Fungi, Ascomycota) on Myrmica ants: Rickia wasmannii in the Netherlands. Journal of Hymenoptera Research 44, 39–47 (doi:10.3897/jhr.44.4951).
- Holecová, M., Klesniaková, M., Hollá, K. & Šestaková, A. (2016). Winter activity of ants in scots pine canopies in Borska Nizina lowland (SW Slovakia). Folia faunistica Slovaca, 21: 239–243.
- Juhász, O., Bátori, Z., Trigos-Peral, G., Lőrinczi, G., Módra, G., Bóni, I., Kiss, P., Aguilon, D., Tenyér, A., Maák, I. 2020. Large- and Small-Scale Environmental Factors Drive Distributions of Ant Mound Size Across a Latitudinal Gradient. Insects 11, 350 (doi:10.3390/INSECTS11060350).
- Kutter, H. 1977c. Hymenoptera, Formicidae. Insecta Helv. Fauna 6: 1-298 (page 272, Status as species)
- Maák, I., Tóth, E., Lenda, M., Lőrinczi, G., Kiss, A., Juhász, O., Czechowski, W., Torma, A. 2020. Behaviours indicating cannibalistic necrophagy in ants are modulated by the perception of pathogen infection level. Scientific Reports 10, 17906 (doi:10.1038/s41598-020-74870-8).
- Mabelis, A. 1984a. Aggression in wood ants (Formica polyctena Foerst., Hymenoptera, Formicidae). Aggressive Behavior. 10:47-53.
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