Australian ant (Nothomyrmecia macrops)

loading
Australian ant on branch
loading
Loading more images and videos...

Australian ant fact file

Australian ant description

KingdomAnimalia
PhylumArthropoda
ClassInsecta
OrderHymenoptera
FamilyFormicidae
GenusNothomyrmecia (1)

This ant of ancient lineage is described as a ‘living fossil.’ It is perhaps the most ‘primitive’ ant still alive today (3). Ants are social insects, which typically live in colonies within nests comprising a single reproductive `queen’ and a force of non-reproductive `workers’, of whom the queen is the mother. Unlike the workers, virgin queens possess wings that are used only once for flight in a mating swarm, following which the wings are shed and the now fertilised queens begin colony foundation, typically alone (2). Seasonally, nests include immatures: eggs, larvae and pupae. Males, which are winged and develop from unfertilised eggs, are present only periodically each year, prior to the breeding season (2). The individual workers typically perform different roles; a characteristic known as `polyethism’ or `division of labour’ (2). Minimally, there are individuals specialised as foragers, working outside the nests, and others, which seldom leave the nests but perform in-nest activities, such as brood care. In advanced species these worker `castes’ may be physically differentiated, often including large-headed `soldiers’ (2). Nothomyrmecia workers are pale yellow in colour and have large eyes, distinctively long mandibles and a powerful sting (4); there is no soldier caste (2). Unusually, the queens have extremely reduced wings that are unlikely to be functional for flight (3). Virgin queens probably mate with flying males on tree trunks or the ground; the function of the reduced wings is not known (2).

Also known as
The 'dinosaur' ant.
Size
Length: 8 - 12 mm (2)
Top

Australian ant biology

These and some other Australian ants (the `bulldog ants (Myrmeciinae)) belong to an ancient linage and have simpler social systems than other modern ants (2). Mature Nothomyrmecia colonies are generally small at 50 - 120 adults (3). The newly mated queens initiate colony foundation in groups of 2 or 3; the dominant female subsequently evicts the subordinate individuals from the nest once the first workers appear (5). The workers of the colony tend the brood and actively hunt for food on trees near the nests. They use their stings to stun prey, such as other invertebrates, which are returned without dissection (2). Unlike most species of ants, Nothomyrmecia workers are able to tolerate low temperatures and tend to forage after dusk when temperatures have dropped to 5 - 10 °C (3). It is thought that the low temperatures may assist foraging, making prey slower and therefore less likely to escape (3). Workers navigate between the nests and forage trees by using the silhouette of the tree canopy like a map (5).

The most significant and unique primitive features of Nothomyrmecia are behavioural (2). Unlike all other studied ants, there is virtually no evidence of worker division of labour within the nests, although some individuals spend extended periods near the queen, and some may act as guards within the nest entrances for up to several days (2). Field experiments involving the marking of foragers and later excavation of subject colonies, show that all but one or two workers may leave the nest to forage over a period of only 2 or 3 nights; the exceptions are believed to be the entrance guards (2). Thus the most elementary and minimal level of task specialisation seen in other ants (that between foragers and in-nest specialists) is absent. Otherwise the workers forage alone and show no evidence of cooperative behaviour, apart from living together in the nest (2). Nothomyrmecia has been referred to as the ‘least sociable’ of all ants (2).

Top

Australian ant range

Originally known from extreme southern Western Australia, this species was thought to be extinct until it was rediscovered near Poochera in South Australia in 1977 (5). Its known range has been recently extended to other areas of southwestern South Australia (2).

Top

Australian ant habitat

Colonies inhabit nests excavated in the soil (4), beneath eucalyptus trees (5).

Top

Australian ant status

Classified as Critically Endangered (CR - B1+2c) on the IUCN Red List 2002 (1).

IUCN Red List species status – Critically Endangered

Top

Australian ant threats

This species has a restricted distribution, and is known only from a small number of sites. Nothomyrmecia is closely associated with eucalyptus trees and is therefore extremely vulnerable to their removal or damage by fire. An underground telephone line was installed at the famous rediscovery site near Poochera, and this led to the almost complete destruction of the then only known population (5).

Top

Australian ant conservation

No conservation measures are currently in place.

View information on this species at the UNEP World Conservation Monitoring Centre.
Top

Authentication

Authenticated (16/6/03) by Dr R. Taylor.

Top

Glossary

Caste
In social insect colonies, a group of individuals that are structurally and/ or behaviourally distinct, performing certain tasks. Examples are the soldier caste of termites and ants, and the workers of bees.
Invertebrate
Animals with no backbone.
Larvae (plural)
Stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Pupa; pl. pupae
Stage in an insect’s development when huge changes occur, which reorganise the larval form into the adult form. In butterflies the pupa is also called a chrysalis.
Top

References

  1. IUCN Red List (October, 2002) www.redlist.org
  2. Taylor, R. (June, 2003) Pers. comm.
  3. Holldobler, B. and Wilson, E.O. (1990) The Ants. Springer-Verlag, Heidelburg.
  4. Australian Ants Online (August, 2002) http://www.ento.csiro.au/science/ants/nothomyrmeciinae/nothomyrmecia/nothomyrmecia.htm
  5. North, R. (1996) Ants. Whittet Books, London.
X
Close

Image credit

Australian ant on branch  
Australian ant on branch

© Densey Clyne / Auscape International

Auscape International
PO Box 1024,
Bowral
NSW
25a76
Australia
Tel: (+61) 2 4885 2245
Fax: (+61) 2 4885 2715
sales@auscape.com.au
http://www.auscape.com.au

X
Close

Link to this photo

ARKive species - Australian ant (Nothomyrmecia macrops) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

Help us share the wonders of the natural world. Donate today!

Blog