Exaireta spinigera has been described by many sources as having an elongated abdomen with four yellow-tipped spikes that protrude from the scutellum, found near the thorax.

Exaireta spinigera is native to Australia but has been introduced to many different countries like New Zealand, Hawaii,[12] North America, Europe,[13] and Russia.

[7] The larvae of Exaireta spinigera prefer living in decaying organic matter[14] and are commonly associated with residential compost bins.

[15] Exaireta spinigera has been noticed in Australia to have a seasonal pattern where activity and sightings peak in Autumn and Spring.

[5] There is a preference for eggs to be laid directly into substrate such as decaying organic matter but not much is known about the rearing, lifecycle and mating behaviour of Exaireta spinigera.

[8] It was assumed that when conditions were too moist the larvae of Exaireta spinigera sought out drier locations to pupate but were not able to be observed.

[4] Predators of Exaireta spinigera include Vespula germanica, the German wasp,[16] Trite planiceps, and the black-headed jumping spider.