OOCERAEA BIROI, the CLONAL RAIDER ANT, is a queenless clonal ant in the genus Ooceraea (recently transferred from the genus Cerapachys ). Native to the Asian mainland, this species has become invasive on tropical and subtropical islands throughout the world. Unlike most ants, which have reproductive queens and mostly nonreproductive workers, all individuals in a O. biroi colony reproduce clonally via thelytokous parthenogenesis . Like most dorylines , O. biroi are obligate myrmecophages and raid nests of other ant species to feed on the brood.
* 1 Description * 2 Cyclic life history * 3 Genetics and genomics * 4 References * 5 External links
Clonal raider ants are small, about 2 mm long, but relatively stocky. Like many former cerapachyines, O. biroi is heavily armored, with the short, thick antennae which give the old subfamily its name (from Greek, keras/κέρας, meaning horn and pachys/παχυς, meaning thick). The other defining characteristic of the former Cerapachyinae, a row of teeth over the pygidium (last visible abdominal segment), is very small in O. biroi and difficult to see. O. biroi can be distinguished from many other former cerapachyines by the combination of highly reduced or nonexistent eyes, rectangular head, and a distinct postpetiole.
CYCLIC LIFE HISTORY
Like many myrmecophagous ants, O. biroi exhibits synchronized oviposition and cyclic behavior, shifting between a reproductive phase and a foraging phase. The reproductive phase begins when a cohort of larvae pupate and all the adults in the colony activate their ovaries. Thelytokously produced eggs are then laid synchronously after about four days and develop for roughly 10 days while the adults remain within the nest, cleaning and tending the eggs and pupae. Eggs hatch roughly two weeks into the reproductive phase, and then a few days later, the foraging phase begins with emergence of new adults from the pupae. Adults forage for the next two weeks, raiding the nests of other ant species to bring back food for the larvae. The cycle completes with the pupation of the new larval cohort and the resumption of the reproductive phase.
GENETICS AND GENOMICS
The effects of central fusion and terminal fusion on heterozygosity
Parthenogenesis is a natural form of reproduction in which growth and
development of embryos occur without fertilisation .