Brown Crazy Ant
Nylanderia vaga
Species Info General
Other common names include: (none
The Brown Crazy Ant is a close cousin of the Robust Crazy Ant (Nylanderia bourbonica), but surprisingly little has been written about this ant. Huddleston & Fluker (1968) wrote, “Occurs sympatrically with [Nylanderia] bourbonica in many habitats, almost as widely distributed with apparently favoring the same ecological conditions”. It is probably safe to assume that this species habits are not too unlike those of bourbonica. Like bourbonica, the Brown Crazy Ant does not sting but is known to bite on occasion. Likewise, this ant seems to be more common on the windward side of the island. In Fiji, Brown Crazy Ants have been found from sea level up to at least 3300 feet elevation, and “In addition to occurring in even the most disturbed of human landscapes, the species also frequently penetrates into interior forest habitats” (Sarnat & Economo 2012).
This species is one of four widespread ants in Hawaiʻi that share the common name adjective “crazy”, the others being Yellow Crazy Ant, Longhorn Crazy Ant and the aforementioned Robust Crazy Ant. This unofficial term in an ant’s common name refers to its habit of moving around in a speedy, erratic manner.
aries of many plants.”
Identification/Description
Hawaiʻi has numerous medium-sized, chunky dark ants, and this is one of them. Several of these species are quite black, but Brown Crazy Ants rarely get that dark. Brown Crazy Ants can vary significantly in color from dirty yellow to very dark brown, but most individuals seem to be a smoky honey color with a gaster that is usually a darker shade than the rest of the body. It is a fast moving ant, often moving about erratically, but it does not seem to present itself in large numbers in the same way that its close relative, Nylanderia bourbonica or Robust Crazy Ant, does. Brown Crazy Ants are slightly smaller than Robust Crazy Ants, but this may not be obvious to the naked eye.
Impacts
- Like many ants, Brown Crazy Ants have been seen tending homopterous insects that are agricultural pests, but data is lacking as to whether this ant is a serious problem for either agriculture or biodiversity.
History
- Brown Crazy Ants were detected on Oʻahu in the late 1800s. By the 1960s they could be found on the four other largest islands, and seem to have shown up on Lānaʻi sometime in the 1980s. This ant has not yet been recorded on Kahoʻolawe.
Resources/References
- Nylanderia vaga – AntWiki
- Huddleston, E. W. & Fluker, S. S. 1968. Distribution of Ant Species of Hawaii. Proceedings of the Hawaiian Entomological Society 20(1): 45–69.
- Sarnat, E. & Economo, E. P. 2012. The Ants of Fiji. University of California Press, Berkeley & Los Angeles, California. 384 pp.
