Prionomyrmecini

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Prionomyrmecini
Nothomyrmecia macrops casent0172002 profile 1.jpg
Nothomyrmecia macrops
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmeciinae
Tribe: Prionomyrmecini
Wheeler, 1915
Genera
Synonyms [1]

Nothomyrmecii Clark, 1934

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.

Contents

Taxonomy

Prionomyrmecini was originally described in 1915 by American entomologist William Morton Wheeler in his journal article "The ants of the Baltic amber", who originally placed it in the subfamily Ponerinae. In the same journal, Wheeler assigned Prionomyrmex as the sole member of the tribe. [2] In 1954, William Brown Jr. moved the tribe to Myrmeciinae, noting similar morphological characteristics of Prionomyrmex and other genera such as Myrmecia and Nothomyrmecia . [3] In 2000, Cesare Baroni Urbani described a new fossil species from Baltic amber, which he named Prionomyrmex janzeni. After examining specimens of his newly described species and Nothomyrmecia, Baroni Urbani noted that Prionomyrmex is a paraphyletic relative to Nothomyrmecia, and the two genera were so morphologically similar that Nothomyrmecia must be synonymised. [4] Due to this, Baroni Urbani separated Prionomyrmex from Myrmeciinae and synonymised Nothomyrmecia, renaming Nothomyrmecia macrops as Prionomyrmex macrops. The tribe itself was later treated as a subfamily, known as Prionomyrmeciinae. In 2003, Dlussky & Perfilieva separated Nothomyrmecia from Prionomyrmex and both genera were moved to the subfamily Myrmeciinae, and Prionomyrmecini was treated as a tribe. [1] [5] In 2005 and 2008, Baroni Urbani provided additional evidence in favour of his proposed classification, but such proposal has been rejected by the entomological community. [6] [7] [8] [9] Nothomyrmecia macrops and the extinct Prionomyrmex are the only accepted members of the tribe. [10]

Description and distribution

Prionomyrmex longiceps from Europe Prionomyrmex longiceps dorsal view Mbi5827d1.jpg
Prionomyrmex longiceps from Europe

Members of Prionomyrmecini can be distinguished from other members by the reduced or lacking ocelli, and a lateral clypeal carina is present. [10] Prionomyrmex ants are characterised by their large size, slender bodies, elongated mandibles and powerful stingers. [3] [9] Lengths vary from 12 to 14 millimetres (0.47 to 0.55 in). Overall, the body structure of Prionomyrmex shows that it is more primitive than Myrmecia. Nothomyrmecia is smaller than Prionomyrmex species, measuring 9.7–11 mm (0.38–0.43 in). [11] The ant has a long stinger, the body is slender and, like Prionomyrmex, has elongated mandibles. The mandibles, however, are less specialised than Myrmecia and Prionomyrmex, elongated and triangular. [12] While Nothomyrmecia and Prionomyrmex are strikingly similar to each other, they can be distinguished from the shape of the node. [11]

Fossil Prionomyrmecini ants existed in Europe during the Eocene and Late Oligocene. Cesare Baroni Urbani collected Prionomyrmex janzeni in Baltic amber from Kaliningrad, Russia and Prionomyrmex wappleri in Germany. [4] [9] Austrian entomologist Gustav Mayr collected Prionomyrmex longiceps in Baltic amber from the Eocene, but the exact location of its discovery is unclear, due to the lost type material. [13] P. longiceps were an arboreal nesting species, living in trees instead of the ground. William Morton Wheeler assumed this due to its long legs, sharp claws and elongated mandibles. Prionomyrmex may have preferred a jungle habitat at low elevations. [2] [3]

Nothomyrmecia is only found in Australia. Until its rediscovery, the genus was only known from the original specimens collected in Western Australia by Amy Crocker in December 1931. [12] Entomologist Robert W. Taylor expressed doubt about the type locality of the ant, but said that the specimens were probably collected from the western end of the Great Australian Bight, south from Balladonia. Entomologists feared that Nothomyrmecia was extinct, as notable biologists such as E.O. Wilson made attempts to find the ant but failed to do so. [14] In 1977, Taylor rediscovered Nothomyrmecia in Poochera, 1300 km (800 mi) away from the original collection site. [12] Colonies are found in old growth mallee woodland with many Eucalyptus species such as Eucalyptus brachycalyx , Eucalyptus oleosa and Eucalyptus gracilis abundant. Only a few small colonies are known in its restricted distribution, listing it as Critically Endangered by the International Union for Conservation of Nature. [15] [16]

Behaviour and ecology

Nothomyrmecia queens with stubby wings, as well as pupae and a worker (left) CSIRO ScienceImage 347 Dinosaur or Fossil Ants INothomyrmecia macropsI.jpg
Nothomyrmecia queens with stubby wings, as well as pupae and a worker (left)

Nothomyrmecia and Prionomyrmex share similar behaviours with other Myrmeciinae relatives. [17] Prionomyrmex may have foraged on the ground or onto trees and low vegetation, feeding on nectar and arthropods. Nothomyrmecia workers, however, drink hemolymph from the insects they capture, and the larvae are carnivorous. [12] It is not known if the ants were active during the day or night, but Nothomyrmecia is a nocturnal ground forager that prefers very cold nights. [18] Both ants have large compound eyes, relying on their vision for prey and navigational purposes. Due to their primitive and simplified social life, workers of both genera do not recruit others to food sources or leave down trail pheromones, suggesting that both these ants are solitary foragers. [12] [17] Prionomyrmex ants were hosts to female stylopid parasites. [19] Predators are unknown for both ants.

Nothomyrmecia queens are brachypterous, meaning that they have stubby rudimentary wings that render them flightless. This may correlate with population structure, possibly as an adaptation in small populated colonies or by unusual ecological requirements. [12] The alates may begin to emerge in late summer and early autumn (March or April), and colony-founding queens excavate to considerable depths underground; queens start to lay eggs by spring. Queens are univoltine and only produce a single generation of ants annually, and eggs may take 12 months to fully develop. [20] When a colony is mature, only 50 to 100 individuals are present in each nest. [21] In some colonies, colony founding can occur within a colony itself when a queen dies, taken over by one of her daughters. This method of colony founding may render a nest immortal. [22]

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<i>Sphecomyrma</i> Extinct genus of ants

Sphecomyrma is an extinct genus of ants which existed in the Cretaceous approximately 79 to 92 million years ago. The first specimens were collected in 1966, found embedded in amber which had been exposed in the cliffs of Cliffwood, New Jersey, by Edmund Frey and his wife. In 1967, zoologists E. O. Wilson, Frank Carpenter and William L. Brown, Jr. published a paper describing and naming Sphecomyrma freyi. They described an ant with a mosaic of features—a mix of characteristics from modern ants and aculeate wasps. It possessed a metapleural gland, a feature unique to ants. Furthermore, it was wingless and had a petiole which was ant-like in form. The mandibles were short and wasp-like with only two teeth, the gaster was constricted, and the middle and hind legs had double tibial spurs. The antennae were, in form, midway between the wasps and ants, having a short first segment but a long flexible funiculus. Three additional species, S. canadensis, S. mesaki and S. nexa, were described in 1985, 2005, and 2024, respectively.

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<i>Prionomyrmex</i> Extinct genus of ants

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<i>Archimyrmex</i> Extinct genus of ants

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.

<i>Yantaromyrmex</i> Genus of ants

Yantaromyrmex is an extinct genus of ants first described in 2013. Members of this genus are in the subfamily Dolichoderinae of the family Formicidae, known from Middle Eocene to Early Oligocene fossils found in Europe. The genus currently contains five described species, Y. constrictus, Y. geinitzi, Y. intermedius, Y. mayrianum and Y. samlandicus. The first specimens were collected in 1868 and studied by Austrian entomologist Gustav Mayr, who originally placed the fossils in other ant genera until the fossils were reviewed and subsequently placed into their own genus. These ants are small, measuring from 4 to 6 mm in length and can be characterized by their trapezoidal shaped head-capsules and oval compound eyes that are located slightly to the rear of the capsules midpoint, with no known ocelli present.

<i>Bradoponera</i> Extinct genus of ants

Bradoponera is an extinct genus of ant in the Formicidae subfamily Proceratiinae, and is one of four genera of the subfamily. The genus contains four described species Bradoponera electrina, Bradoponera meieri, Bradoponera similis, and Bradoponera wunderlichi. The species are known from several Middle Eocene amber fossils which were found in Europe.

References

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  14. ↑ Hoyt, Erich (1997). The earth dwellers: adventures in the land of ants (1st ed.). New York: Touchstone. p. 108. ISBN   978-0-684-83045-2.
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