|Junior synonym of Temnothorax unifasciatus: Nylander, 1856b PDF: 92; of Temnothorax nylanderi: Smith, 1858a PDF: 120; of Temnothorax tuberum: Emery, 1924f PDF: 256.|
This species has the typical ant body pattern of head, mesosoma and metasoma, with the first two segments of the metasoma forming a distinct waist. It is light brown and has a few short pale coloured hairs. The antennae are elbowed and there are a pair of compound eyes and three ocelli.
As with other ants, there is a single, relatively large queen that lays eggs in the nest and a large number of workers. These are all non-breeding females and leave the nest to forage and collect building materials for its construction and repair.
T. albipennis builds simple nests in cracks in rocks, enclosed by walls built from tiny pebbles and grains of sand. In an experiment where two sizes of sand grain were offered to ants that were foraging for building materials, the ants always chose the smaller grains although this was wasteful in terms of building efficiency. Another experiment examined the division of labour in ant colonies and found that there tended to be a few high performance workers in small colonies which performed tasks considerably more efficiently than the other workers. This was not the case in larger colonies, and in both cases, there were a high proportion of inactive workers.
Ants are one of the most successful insects on the planet and there is a long-held view that this is because of the division of labour and the way certain workers specialise in certain tasks. Another experiment examined whether these specialist ants actually performed the task better than other workers. The ants were marked with drops of paint and then were videotaped while they performed such tasks as foraging, transporting the brood and nest building. The conclusions were that, though some ants performed a range of jobs and others specialised in a single task, the latter were found not to be any more efficient at their selected tasks than were the generalists. However the specialists did put in more time on the job than the other ants so the colony overall benefited from their specialisation.
Ants of this species have been observed teaching each other through a process known as tandem running. An experienced forager leads a naive nest-mate to a newly discovered food source. The follower obtains knowledge of the route by following in the footsteps of the tutor, maintaining contact with its antennae. Both leader and follower are aware of the progress made by the other with the leader slowing when the follower lags and speeding up when the follower gets too close.
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- Franks NR, Richardson T (2006). "Teaching in tandem-running ants". Nature 439 (7073): 153. doi:10.1038/439153a. PMID 16407943.