Myrmecia nigriceps | |
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Myrmecia nigriceps worker from Strangways, Victoria | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Hymenoptera |
Family: | Formicidae |
Subfamily: | Myrmeciinae |
Genus: | Myrmecia |
Species: | M. nigriceps |
Binomial name | |
Myrmecia nigriceps | |
Synonyms | |
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Myrmecia nigriceps, also known as the black-headed bull ant, is a species of ant endemic to Australia. A member of the genus Myrmecia in the subfamily Myrmeciinae, it was first described by Austrian entomologist Gustav Mayr in 1862. These ants are large, varying from 19 to 23 millimetres (0.75 to 0.91 in) in length. However, colonies contain workers that are much smaller, usually half the size of normal workers. The queens are the largest while the males are the smallest, which can be easily identified due to their small mandibles.
Mainly nocturnal M. nigriceps is found in hot hilly areas and woodland, nesting underground in mounds. The ant's diet consists of sweet liquids from flowering plants and invertebrate prey, which are fed to the carnivorous larvae. Spiders are known to eat these ants, and echidnas consume the larvae and pupae. Like other Myrmecia species, M. nigriceps ants possess a powerful and painful sting, and the venom is capable of inducing allergic reactions in sensitive people.
First identified by Gustav Mayr in 1862, Mayr provided the first description of M. nigriceps in his journal Myrmecologische Studien. The species was described under the binomial name Myrmecia nigriceps, based on syntype workers collected from Gayndah and Sydney. [2] In 1907, Swiss myrmecologist Auguste Forel treated M. nigriceps as a variant of M. vindex , but he eventually treated it as a synonym in 1910. [3] [4] M. nigriceps was revived as a full species in 1933 by American entomologist William Morton Wheeler, on the basis that it is distributed throughout Australia and its average size is greater than M. vindex. [5] Scottish born Australian entomologist John S. Clark published one synonym – Myrmecia fasciata, now considered a junior synonym. [6] M. nigriceps is a member of the genus Myrmecia, a part of the primitive subfamily Myrmeciinae; most ancestors of the genus are only found in fossils, with the exception of the dinosaur ant ( Nothomyrmecia macrops ). [7] [8]
Myrmecia nigriceps is a member of the M. gulosa species group, which is the largest species group of the nine groups described. [6] The specific name, nigriceps, is a combination of the Latin words niger, meaning "black", and caput, meaning "head". This references the distinctive black head of the ant. With this said, M. nigriceps is commonly known as the black-headed bull ant. [9]
The size of worker ants varies from 19 to 23 millimetres (0.75 to 0.91 in). However, colonies contain very small workers, usually less than half the size of normal sized workers. Despite this, it is not known if M. nigriceps is polymorphic, due to little differences in morphology between the workers in comparison to Formicinae ants and Pheidole , with soldiers having enormous heads. [10] The queens are the largest, measuring around 24 to 26 millimetres (0.94 to 1.02 in), and males being around similar sizes to worker ants at 18 to 20 millimetres (0.71 to 0.79 in). [11] The head and gaster are black, and the thorax, node, and postpetiole are either red or yellowish red, while the antennae and legs are either yellow or testaceous. The mandibles and clypeus are also yellow. [11] The hair is short and yellow in colour, erect on the body and suberect on the legs. The pubescence (short, fine, soft hair) is white and abundant all over the postpetiole and gaster. The head is almost as broad as its total length, and the mandibles are longer than the head with 13 teeth present. [11]
The queen is similar in appearance to the worker, but they are the largest members of the colony. The hair is more abundant, and the head is broader. The mandibles are shorter and broader, although they are still as long as the head. [11] The wings are yellowish in colour and translucent in appearance. Males are the smallest members of the colony and can be easily identifiable by their perceptibly smaller mandibles. The hairs on males are the longest and most abundant among the worker and queen castes, with a long and broad head. [11]
Myrmecia nigriceps is similar in appearance to M. vindex, but several morphological characters distinguish these two species from each other. For example, M. nigriceps is generally larger than M. vindex, and its head is either black or dark brown; the head is broader and more rectangular in workers. The thorax and pedicel are noticeably darker and brownish red. The nests and behaviour, however, of both ants are similar to each other. [5]
Myrmecia nigriceps is distributed throughout Australia, but the ant is absent from areas in central Australia and the northern Australian coast. [5] [12] The range of M. nigriceps extends from Queensland and down into New South Wales, the Australian Capital Territory and Victoria. [11] It is also found in South Australia and Western Australia. [5] Colonies are found in deserts, coastal areas, plateaus, woodland, native vegetation, hot hilly areas covered with scrubby vegetation and in rehabilitated sites, at elevations ranging from 300 to 460 metres (1,000 to 1,500 ft). [13] [14] [15] [16]
Myrmecia nigriceps is a mound constructing species, although colonies can be found under logs. [5] [17] Workers decorate the nest with a variety of items, including lateritic pebbles and soil crumbs, in a similar fashion of meat ant (Iridomyrmex purpureus) nests. [17] Other items used for nest decorating include small stones and plant material. [18]
Myrmecia nigriceps ants are crepuscular and nocturnal foragers, searching for food during the night. [19] [20] Workers are found foraging on Eucalyptus trees and is sympatric with many species. [21] Adults are nectarivores, feeding on sweet liquids from plants and the larvae are carnivorous, feeding on captured invertebrates and other ants such as Camponotus workers and males. [5] [18] [22] Cockroaches, such as Platyzosteria castanea and Platyzosteria ruficeps , can repel attacks by M. nigriceps by discharging a secretion that disorientates the attacking workers. [23] Workers begin to forage one hour before sunset, with peak activity occurring during the twilight hours. These ants have excellent vision, having the largest eye lenses and photoreceptors than any other Myrmecia ant. [20] These ants are capable of discriminating the distance and size of objects moving nearly a metre away, sensitive to motion and will rapidly charge towards any moving objects to attack it. [24]
These ants are preyed on by the short-beaked echidna (Tachyglossus aculeatus), and by spiders in the genus Zenodorus , particularly Zenodorus metallescens . [25] [26] Blindsnakes are known to consume the larvae and pupae of these ants. [27] Colonies are also a host for M. inquilina , a social parasite that lays its eggs inside the colony. [28]
Myrmecia nigriceps is an extremely aggressive ant, and larger colonies may rival other colonies of a different Myrmecia species (such as M. gulosa ) in terms of fierceness and pugnacity. [5] While the mandibles cause little to no pain in humans, the ant is equipped with a painful and powerful sting that is found at the end of the gaster. Like other ants, the sting is not barbed, and workers are able to sting multiple times without injuring themselves. [29] With a median lethal dose (LD50) of 7.3 mg/kg, the venom is relatively weak in comparison to other Myrmecia ants, whose LD50 is much lower. [lower-alpha 1] [31] However, in a 2011 study, at least one patient had an allergic reaction to M. nigriceps venom. This study also concluded that many other Myrmecia species can cause anaphylaxis, as well as the Green-head ant (Rhytidoponera metallica). [32] In the Starr sting pain scale, a scale which compares the overall pain of hymenopteran stings on a four-point scale, the sting of M. nigriceps was ranked as two in pain, described as "painful". [33] M. nigriceps ants are able to enter colonies they do not reside in without being attacked; this may be due to these ants failing to recognise foreigners, or the consequences of ignoring workers from other colonies is low. [34] [35]
Nuptial flight occurs after rain for several days, taking place between December and March. The males and virgin queens emerge from their nest, and unlike other species who mate on the ground or climb onto nearby trees or branches to fly off from, the reproductive alates will fly from the nest. Recorded nuptial flights usually took place on hilltops. [21] M. nigriceps queens are not known to seal up their entrance during colony foundation, unlike other Myrmecia species such as M. regularis . [36] Workers can live exceptionally long, with an average lifespan of 2.2 years; maximum longevity in workers varied from 2.1 to 2.4 years. [37] [38] [39]
Paraponera clavata, commonly known as the bullet ant, is a species of ant known for its extremely painful sting. It inhabits humid lowland rainforests in Central and South America.
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.
Myrmeciinae is a subfamily of the Formicidae, ants once found worldwide but now restricted to Australia and New Caledonia. This subfamily is one of several ant subfamilies which possess gamergates, female worker ants which are able to mate and reproduce, thus sustaining the colony after the loss of the queen. The Myrmeciinae subfamily was formerly composed of only one genus, Myrmecia, but the subfamily was redescribed by Ward & Brady in 2003 to include two tribes and four genera. An additional three genera, one form genus, and 9 species were described in 2006 from the Early Eocene of Denmark, Canada, and Washington. Subsequently an additional fossil genus was moved from the family Rhopalosomatidae in 2018, and a new genus was described in 2021.
The jack jumper ant, also known as the jack jumper, jumping jack, hopper ant, or jumper ant, is a species of venomous ant native to Australia. Most frequently found in Tasmania and southeast mainland Australia, it is a member of the genus Myrmecia, subfamily Myrmeciinae, and was formally described and named by British entomologist Frederick Smith in 1858. This species is known for its ability to jump long distances. These ants are large; workers and males are about the same size: 12 to 14 mm for workers, and 11 to 12 mm for males. The queen measures roughly 14 to 16 mm long and is similar in appearance to workers, whereas males are identifiable by their perceptibly smaller mandibles.
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.
Myrmecia gulosa, the red bull ant, also known as the giant bull ant or "hoppy joe", is a species of bulldog ant from the genus Myrmecia. It is abundant throughout Eastern Australia.
Myrmecia inquilina is a species of ant endemic to Australia in the subfamily Myrmeciinae, first discovered in 1955 and described by Athol Douglas and William Brown Jr. in 1959. These ants are large, measuring 21.4 millimetres (0.84 in). During the time of its discovery, Douglas and Brown announced M. inquilina as the first social parasite among the primitive subfamilies, and today it is one of the two known Myrmecia species to have no worker caste. Two host species are known, Myrmecia nigriceps and Myrmecia vindex. Aggression between M. inquilina and its host species does not occur, and colonies may only produce M. inquilina brood months after the inquiline queens begin to lay their eggs. Queens eat the colony brood or trophic eggs, and other Myrmecia species may kill M. inquilina queens if they reject them. Due to its restricted distribution and threats to its habitat, the ant is "vulnerable" according to the IUCN Red List.
The green-head ant is a species of ant that is endemic to Australia. It was described by British entomologist Frederick Smith in 1858 as a member of the genus Rhytidoponera in the subfamily Ectatomminae. These ants measure between 5 and 7 mm. The queens and workers look similar, differing only in size, with the males being the smallest. They are well known for their distinctive metallic appearance, which varies from green to purple or even reddish-violet. Among the most widespread of all insects in Australia, green-head ants are found in almost every Australian state, but are absent in Tasmania. They have also been introduced in New Zealand, where several populations have been established.
Prionomyrmex is an extinct genus of bulldog ants in the subfamily Myrmeciinae of the family Formicidae. It was first described by Gustav Mayr in 1868, after he collected a holotype worker of P. longiceps in Baltic amber. Three species are currently described, characterised by their long mandibles, slender bodies and large size. These ants are known from the Eocene and Late Oligocene, with fossil specimens only found around Europe. It is suggested that these ants preferred to live in jungles, with one species assumed to be an arboreal nesting species. These ants had a powerful stinger that was used to subdue prey. In 2000, it was suggested by Cesare Baroni Urbani that the living species Nothomyrmecia macrops and a species he described both belonged to Prionomyrmex, but this proposal has not been widely accepted by the entomological community. Instead, scientists still classify the two genera distinctive from each other, making Nothomyrmecia a valid genus.
Ochetellus glaber is a species of ant native to Australia. A member of the genus Ochetellus in the subfamily Dolichoderinae, it was described by Austrian entomologist Gustav Mayr in 1862. Aside from Australia, O. glaber has been introduced to a number of countries, including China, India, Japan, New Zealand, the Philippines and the United States, where it has established itself in Hawaii and Florida. It has been found on Lord Howe Island, New Caledonia, Norfolk Island, Réunion, New Zealand, and the Solomon Islands. Compared with other ants, O. glaber is a small species, with workers measuring 2–3 mm (0.079–0.118 in). Males are the smallest at 1.6 mm (0.063 in), while the queens measure 5.2–5.5 mm (0.20–0.22 in). The ant's colour ranges from brown to black.
Macabeemyrma is an extinct genus of bulldog ants in the subfamily Myrmeciinae containing the single species Macabeemyrma ovata, described in 2006 from Ypresian stage deposits of British Columbia, Canada. Only a single specimen is known; a holotype queen found preserved as a compression fossil. The specimen had no wings and small portions of its legs and eyes were faintly preserved. It was a large ant, reaching 25 millimetres (0.98 in) in length. This ants' behaviour would have been similar to that of extant Myrmeciinae ants, such as foraging singly in search for arthropod prey and nesting in soil or in trees. Macabeemyrma shows similarities to extinct ants in the genus Ypresiomyrma, and to the living Nothomyrmecia macrops, but has not been conclusively assigned to any tribe, instead generally regarded as incertae sedis within Myrmeciinae. However, the sole specimen lacks definitive traits, and its classification in Myrmeciinae, and even its identity as an ant, has been challenged.
Prionomyrmecini is an ant tribe belonging to the subfamily Myrmeciinae established by William Morton Wheeler in 1915. Two members are a part of this tribe, the extant Nothomyrmecia and the extinct Prionomyrmex. The tribe was once considered a subfamily due to the similarities between Nothomyrmecia and Prionomyrmex, but such reclassification was not widely accepted by the scientific community. These ants can be identified by their long slender bodies, powerful stingers and elongated mandibles. Fossil Prionomyrmecini ants were once found throughout Europe, possibly nesting in trees and preferring jungle habitats. Today, Prionomyrmecini is only found in Australia, preferring old-growth mallee woodland surrounded by Eucalyptus trees. Nothomyrmecia workers feed on nectar and arthropods, using their compound eyes for prey and navigational purposes. Owing to their primitive nature, they do not recruit others to food sources or create pheromone trails. Nothomyrmecia colonies are small, consisting of 50 to 100 individuals.
Myrmecia vindex is a species of Myrmecia which is endemic to Australia. As a subgroup of the Myrmecia gulosa species group, these ants are also commonly known as the Bull Ant. The Myrmecia vindex was collected and described by Frederick Smith in 1858.
Myrmecia pyriformis, also known as the bull ant or inch ant, is an Australian ant. Myrmecia pyriformis belongs to the genus Myrmecia. It is abundant in many major cities of Australia, but mostly spotted in the eastern states. The species is of a similar appearance to the Myrmecia forficata.
Myrmecia nigrocincta, commonly known as the jumper ant or jumping jack, is an ant of the genus Myrmecia. The species was first described by Frederick Smith in 1858. Colonies of this ant are abundant in eastern Australia. Ants of this species are known for their ability to jump up to 10 centimetres, and they also have a powerful, venomous sting. Rather than foraging on the ground, M. nigrocincta prefer to forage in trees where they are known to pollinate certain flowers.
Myrmecia regularis is a species of ant endemic to Australia. A member of the genus Myrmecia in the subfamily Myrmeciinae, it was first described by American entomologist Walter Cecil Crawley in 1925. These ants are medium to large in size, measuring 10 to 20 millimetres, and they are bright brownish-red in colour. Queens and workers share similar morphological features, but they can be distinguished by the noticeable size difference. Males also look similar, but collected specimens are too damaged to be examined properly.
Myrmecia maxima is an unidentifiable species of ant endemic to Australia. A member of the genus Myrmecia in the subfamily Myrmeciinae, M. maxima was first described by George Fletcher Moore in 1842. As no type specimen is available, M. maxima cannot be confidently identified, but the only description Moore had provided undoubtedly describes a large Myrmecia species, having long, sharp mandibles and a formidable sting. It is still classified as a valid species. The ant resides in the south-west regions of Western Australia. As other Myrmecia species have been identified in these regions, M. maxima is possibly a senior synonym of one of these ants. Its former name is recognised as an invalid name after it was suppressed under plenary powers in 1976.
Archimyrmex is an extinct genus of ant in the formicid subfamily Myrmeciinae, described by palaeoentomologist Theodore Cockerell in 1923. The genus contains four described species, Archimyrmex rostratus, Archimyrmex piatnitzkyi, Archimyrmex smekali and Archimyrmex wedmannae. Archimyrmex is known from a group of Middle Eocene fossils which were found in North America, South America, and Europe. The genus was initially placed in the subfamily Ponerinae, but it was later placed in Myrmeciinae; it is now believed to be the ancestor of the extant primitive genus Myrmecia from Australia. Despite this, Archimyrmex is not a member to any tribe and is regarded as incertae sedis within Myrmeciinae. However, some authors believe Archimyrmex should be assigned as incertae sedis within Formicidae. These ants can be characterised by their large mandibles and body length, ranging from 13.2 to 30 mm. They also have long, thin legs and an elongated mesosoma (thorax) and petiole.
The black-headed sugar ant, also known as the brown sugar ant, is a species of Formicinae ant endemic to Australia. Found throughout most states, the species is a member of the genus Camponotus, a cosmopolitan genus of ants commonly known as carpenter ants. It was formally described and named by British entomologist Frederick Smith in 1858. These ants are characterised by their black head, reddish-brown mesosoma and black gaster, which can change in colour.