Temnothorax | |
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Temnothorax affinis, Belgium | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Hymenoptera |
Family: | Formicidae |
Subfamily: | Myrmicinae |
Tribe: | Crematogastrini |
Genus: | Temnothorax Mayr, 1861 |
Type species | |
Temnothorax recedens Nylander, 1856 | |
Diversity [1] | |
380 species | |
Synonyms | |
AntillaemyrmexMann, 1920 Contents |
Temnothorax is a genus of ants in the subfamily Myrmicinae. It contains more than 380 species. [1]
The workers of Temnothorax species are generally small. Colonies are typically monogynous, although facultative polygyny has been documented in several species. Colony populations are usually quite small, often with less than 100 workers. However, several studies have found colonies of some species to be widely dispersed with several to many satellite nests. Many species are arboreal, living within hollow stems, old beetle or termite galleries, or in galls. Temnothorax species appear to be trophic generalists, feeding on a wide variety of scavenged items, including the elaiosomes of seeds. None have been documented to be active or aggressive predators. [4]
Recent molecular phylogenetic studies show that the genera Chalepoxenus, Myrmoxenus and Protomognathus are nested within Temnothorax, and that the latter is distinct from the more distantly related genera Formicoxenus , Leptothorax and Harpagoxenus . Species in these 'satellite' genera live as social parasites within the nests of other species of Temnothorax. [4]
As Temnothorax colonies are small and easy to maintain in a laboratory environment, they are often used to study social behaviour in ants. [1] Temnothorax have been used to show displays of social structures through communication, colony responsibility, and influence.
Communication among ants has been observed[ by whom? ] and assumed to be entirely influenced through substrate-bound odor cues. However, this previous determined social factor has been disproved among the Temnothorax as recorded in the study conducted by Sean R Bowens, Daniel P Glatt, and Stephen C Pratt. Their study observed the navigational influences during emigration. The study consisted of forcing emigration in a colony to a new nest and change the visual and odor cues to the old nest. The new nest was rotated 60 degrees around the old nest in order to keep the visual cues but expel odor cues. The ants were then observed by their success in finding their way back to the old nest. When the odor cues were obstructed but the visual cues were not the ants did not have a problem locating the old nest. The study then changed to remove both the odor and visual cues. When this was done the ants showed disoriented behavior when searching for the old nest. Lastly, the study observed the ants when the visual cue was obstructed but not the odor cues. It was discovered that when the visual cues were obstructed and the ant had only odor cues to use for navigation the ants continued to display disoriented behavior and not only could not find the old nest, they walked in the opposite direction from it. This has led the study to conclude that among Temnothorax this species relies on visual cues rather than odor cues, and it is now assumed that odor cues are simply used to mark territory. [5]
Among the Temnothorax it has been studied as to how effectively the queen of a colony can dominate the reproductive decisions of her workers. In a study completed by Elisabeth Brunner, Johannes Kroiss, Andreas Trindl, and Jürgen Heinze, the queens of different colonies among similar species were observed in their influence over the reproduction of male workers; and whether or not the queen was manipulating their reproduction through active suppression or by implanting an honest signal of pheromones to broadcast fertility status. The study looked at queens in a mixed-species colonies and in colonies of the same species and at the cast-specific patterns of the cuticular hydrocarbons present. In the mixed- species colonies the queens were not able to completely suppress the reproduction of the male workers. In the colonies consisting of the same species the queen was able to suppress the male workers. It could be that the chemical profiles of the cuticular hydrocarbons differentiated between the queens of separate species. However, since the queens were still able to suppress the male workers somewhat, this supports the hypothesis that queens use an honest signal to manipulate the reproduction of male workers. [6]
In a study completed by Anna Dornhaus, Jo-Anne Holley, and Nigel R. Franks, the communal responsibilities within the colonies of Temnothorax were observed to determine if the size of a colony influences the division of labor among workers. By studying 11 colonies of both large and small population sizes (a small colony to consist of 200 to 400 individuals and a large colony to consist of 500 to 700 individuals) with approximately less than 1100 individually marked worker ants the researchers were able to determine how tasks were divided and the proportion of how many workers were active or inactive in the completion of tasks. The researchers charted seven different task required to be done during the emigration process from an old nest to a new one: scouting, brood transport, adult transport, collection of food which was separated into two tasks for collecting dead flies (Drosophila) and collecting honey solution, collection of sand materials for wall building, and the actual task of wall building. It was observed that between the sizes of the large and small colonies the ratio of active and non-active works was consistent, with the larger colonies having a slightly higher ratio of active workers but not enough to be statistically significant. It was also observed that among active and inactive workers it was consistent that usually less than 25% and never more than 50% of the workers were active. This could be that the non-active workers were completing tasks that were not being observed. Specialization of tasks was also not determined by colony size. However of the active workers it was shown that there was a disproportion of the rate at which active workers complete tasks with typically a few individuals doing more of the work than the other active workers. These ratios were also consistent in times when either a high or low phase of activity was required to complete emigration to the new nest. [7]
Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from vespoid wasp ancestors in the Cretaceous period. More than 13,800 of an estimated total of 22,000 species have been classified. They are easily identified by their geniculate (elbowed) antennae and the distinctive node-like structure that forms their slender waists.
Solenopsis invicta, the fire ant, or red imported fire ant (RIFA), is a species of ant native to South America. A member of the genus Solenopsis in the subfamily Myrmicinae, it was described by Swiss entomologist Felix Santschi as a variant of S. saevissima in 1916. Its current specific name invicta was given to the ant in 1972 as a separate species. However, the variant and species were the same ant, and the name was preserved due to its wide use. Though South American in origin, the red imported fire ant has been accidentally introduced in Australia, New Zealand, several Asian and Caribbean countries, Europe and the United States. The red imported fire ant is polymorphic, as workers appear in different shapes and sizes. The ant's colours are red and somewhat yellowish with a brown or black gaster, but males are completely black. Red imported fire ants are dominant in altered areas and live in a wide variety of habitats. They can be found in rainforests, disturbed areas, deserts, grasslands, alongside roads and buildings, and in electrical equipment. Colonies form large mounds constructed from soil with no visible entrances because foraging tunnels are built and workers emerge far away from the nest.
Myrmecia is a genus of ants first established by Danish zoologist Johan Christian Fabricius in 1804. The genus is a member of the subfamily Myrmeciinae of the family Formicidae. Myrmecia is a large genus of ants, comprising at least 93 species that are found throughout Australia and its coastal islands, while a single species is only known from New Caledonia. One species has been introduced out of its natural distribution and was found in New Zealand in 1940, but the ant was last seen in 1981. These ants are commonly known as bull ants, bulldog ants or jack jumper ants, and are also associated with many other common names. They are characterized by their extreme aggressiveness, ferocity, and painful stings. Some species are known for the jumping behavior they exhibit when agitated.
Carpenter ants are large ants indigenous to many forested parts of the world.
Harpegnathos saltator, sometimes called the Indian jumping ant or Jerdon's jumping ant, is a species of ant found in India. They have long mandibles and have the ability to leap a few inches. They are large-eyed and active predators that hunt mainly in the early morning. The colonies are small and the difference between workers and queens is very slight.
Nothomyrmecia, also known as the dinosaur ant or dawn ant, is an extremely rare genus of ants consisting of a single species, Nothomyrmecia macrops. These ants live in South Australia, nesting in old-growth mallee woodland and Eucalyptus woodland. The full distribution of Nothomyrmecia has never been assessed, and it is unknown how widespread the species truly is; its potential range may be wider if it does favour old-growth mallee woodland. Possible threats to its survival include habitat destruction and climate change. Nothomyrmecia is most active when it is cold because workers encounter fewer competitors and predators such as Camponotus and Iridomyrmex, and it also increases hunting success. Thus, the increase of temperature may prevent them from foraging and very few areas would be suitable for the ant to live in. As a result, the IUCN lists the ant as Critically Endangered.
Mycocepurus smithii is a species of fungus-growing ant from Latin America. This species is widely distributed geographically and can be found from Mexico in the north to Argentina in the south, as well as on some Caribbean Islands. It lives in a variety of forested habitats and associated open areas. Two studies published in 2009 demonstrated that some populations of the species consist exclusively of females which reproduce via thelytokous parthenogenesis. A detailed study found evidence of sexual reproduction in some populations in the Brazilian Amazon. Accordingly, M. smithii consists of a mosaic of sexually and asexually reproducing populations. In asexual populations all ants in a single colony are female clones of the queen. Inside the colony, the ants cultivate a garden of fungus grown with pieces of dead vegetable matter, dead insects, and insect droppings.
Solenopsis saevissima, commonly known in Brazil as formiga de fogo, formiga-vermelha, or formiga-lava-pes, is one of more than 185 species in the genus Solenopsis. It, along with 13 other species, is also a member of the Solenopsis saevissima species group which are popularly known as fire ants.
Pogonomyrmex occidentalis, or the western harvester ant, is a species of ant that inhabits the deserts and arid grasslands of the American West at or below 6,300 feet (1,900 m). Like other harvester ants in the genus Pogonomyrmex, it is so called because of its habit of collecting edible seeds and other food items. The specific epithet "occidentalis", meaning "of the west", refers to the fact that it is characteristic of the interior of the Western United States; its mounds of gravel, surrounded by areas denuded of plant life, are a conspicuous feature of rangeland. When numerous, they may cause such loss of grazing plants and seeds, as to constitute both a severe ecological and economic burden. They have a painful and venomous sting.
Temnothorax albipennis, the rock ant is a species of small ant in the subfamily Myrmicinae. It occurs in Europe and builds simple nests in rock crevices.
Worker policing is a behavior seen in colonies of social hymenopterans whereby worker females eat or remove eggs that have been laid by other workers rather than those laid by a queen. Worker policing ensures that the offspring of the queen will predominate in the group. In certain species of bees, ants and wasps, workers or the queen may also act aggressively towards fertile workers. Worker policing has been suggested as a form of coercion to promote the evolution of altruistic behavior in eusocial insect societies.
Leptothorax acervorum is a small brown to yellow ant in the subfamily Myrmicinae. It was first described by Johan Christian Fabricius in 1793. L. acervorum is vastly distributed across the globe, most commonly found in the coniferous forests of Central, Western and Northern Europe. The morphology of L. acervorum is extremely similar to that of other Leptothorax ants. The difference arises in the two-toned appearance of L. acervorum, with the head and metasoma being darker than the mesosoma segment of the body, and hair across its body. Following Bergmann's rule—unusually, for ectothermic animals—body size increases with latitude.
Temnothorax unifasciatus is a species of ant in the subfamily Myrmicinae.
Slave-making ants or slaver ants are brood parasites that capture broods of other ant species to increase the worker force of their colony. After emerging in the slave-maker nest, slave workers work as if they were in their own colony, while parasite workers only concentrate on replenishing the labor force from neighboring host nests, a process called slave raiding.
An ergatoid is a permanently wingless reproductive adult ant or termite. The similar but somewhat ambiguous term ergatogyne refers to any intermediate form between workers and standard gynes. Ergatoid queens are distinct from other ergatogyne individuals in that they are morphologically consistent within a species and are always capable of mating, whereas inter caste individuals, another class of ergatogynes, often are not. Ergatoids can exhibit wide morphological differences between species, sometimes appearing almost identical to normal workers and other times being quite distinct from both workers and standard queens. In addition to morphological features, ergatoids among different species can exhibit a wide range of behaviors, with some ergatoids acting only as reproductives and others actively foraging. Ergatoid queens have developed among a large number of ant species, and their presence within colonies can often provide clues on the social structures of colonies and as to how new colonies are founded. Without wings, almost all species of ants that solely produce ergatoid queens establish new colonies by fission.
Polybia sericea is a social, tropical wasp of the family Vespidae that can be found in South America. It founds its colonies by swarming migrations, and feeds on nectar and arthropods.
Temnothorax nylanderi is a species of ant in the genus Temnothorax. The species is found in western Europe. It was first described by Förster (1850) based on a male from Germany.
Temnothorax rugatulus is a species of ant in the genus Temnothorax. It is found in North America. More specifically, it is found in the forests of the western United States. Colonies are either monogynous or polygynous. Queens in monogynous colonies are generally larger (marcogynes), about twice the size of conspecific workers; polygynous colonies have smaller queens (microgynes), typically slightly smaller than the workers. T. rugatulus ants are a subdominant ant group.
This is a glossary of terms used in the descriptions of ants.
Leptothorax muscorum is a species of ant of the genus Leptothorax that ranges through a variety of habitats throughout much of Europe, northern Asia, and North and Central America, with a particularly wide distribution in the palearctic. Capable of surviving in extreme Arctic-Alpine conditions, the species is perhaps the northernmost dwelling ant indigenous to the Western Hemisphere.
"Genus: Temnothorax". antweb.org. AntWeb . Retrieved 5 July 2014.