Ant identification: February 2012 Archives

Bas--

After a couple responses from two of our African ant experts--James Trager & Peter Hawke--we have confirmed that the ants from your picture are the savannah form of the southern African ant Camponotus fulvopilosus. One of our experts believes this could be an example of their known behavior of "tandem running". Unfortunately, there are no pictures on AntWeb currently, but one of our experts mentioned that he has some queued up for imaging, and thus will be up on the site sometime this year.

As an aside, the species is very aggressive, and the majors can inflict a painful bite! Apparently, their sting contains a 45% solution of formic acid, and have a tendency to do so after running up your legs! Beware!

Thanks for your question!

Max Winston & the AntAsk Team

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Last year I was in Namibia and near the Waterberg plateau I've seen these giant ants marching. Can anybody help me with identification? I don't have a clue. If suggestions could be mailed to b.brinkhof@uu.nl I would be very grateful,

Bas Brinkhof
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Dear AntAsk:

I have found several of these creatures that sort of look like ants, but I don't believe they are. DSC_0473.jpg
I live in mid Michigan. I do have firewood in the room where they were found. The bugs don't seem to have very big mandibles compared to their size of 1cm. They have distinctive markings on their backs. Do you have any idea what they might be?

Jim
Wacousta, Michigan


Hello Jim:

Sorry to take a few days to get back to you on this. I had to consult with a beetle expert colleague to make sure I was giving you the right information in this reply. Here's what he wrote: "They are cerambycid beetles - the first (0472 and 0473) are Cyrtophorus verrucosus, and the last (0474) is Euderces picipes. Yes, they are both ant-mimics (and a nice example of convergence as they are not particularly closely related to each other)." I would add that both of these beetles mature in dead wood, and no doubt were stimulated to emerge by the warmth inside your house.

We get quite a few inquiries about other critters that look more or less like ants. Some of these might be considered true ant mimics (other animals that look more definitely ant-like in appearance and outward behavior than other members of their respective taxonomic families), and others are not especially ant-like, but are perceived as such by folks having little experience with insects, generally. Here are a couple of relevant posts:
http://www.antweb.org/antblog/2010/07/if-it-looks-like-an-ant.html

http://www.antweb.org/antblog/2010/09/are-these-ants-torie-charleston-sc-usa.html

James C. Trager of the AntAsk Team



Dear AntAsk,

Last night my brother was stung by something that looked a lot like the Myrmecia piliventris. I didn't take a picture (I was too busy trying to kill it), but I found Alex Wild's photo on the internet, and the thing that bit my brother looked a lot like it.
I read on Wikipedia that these ants are mostly found in Australia, and since we live in Namibia, I was wondering what it could be? Any idea?

Thanks!
Corien


Dear Corien,

Next time, kill the ant more carefully! (or better yet, photograph it alive, like Alex Wild would). Without specific information about which parts of the ant reminded you of Myrmecia, it's hard to say what species it was. One thing I'm fairly certain of is that it is not Myrmecia piliventris. Unless you or one of your neighbors just came back from a trip to Australia, it's pretty unlikely that genus would show up anywhere outside of Australia, or the islands immediately next to it (Myrmecia is also native to New Caledonia). Members that genus have been reported by New Zealand quarantine officers, though, so it's not impossible that commerce will one day introduce a "bulldog" ant to some place beyond the land down under.

I'd say your best bet is to check our Ants of Kenya page. It's still not exactly Namibia, but the genera at least are much more likely to occur in both Kenya and Namibia than Australia and Namibia.

If it was the mouthparts (mandibles) of Myrmecia that reminded you of the ant that stung your brother, then some possibilities that leap to mind are the genera Leptogenys and Plectroctena. Plectroctena can grow quite large (with a headwidth of 4mm). Leptogenys are generally smaller, and look as if they are probably faster. Although they do have pretty noticeable stings, it would have been difficult to see the mandibles on most Leptogenys species I'm aware of without using a microscope, so I doubt it's that one.

Another noteworthy trait that Myrmecia has are their large eyes. In Africa, Asia, and Australia, the ants with some of the largest eyes relative to their head sizes belong to the genus Tetraponera. These ants (and their relatives in the Americas, Pseudomyrmex) have some of the largest eyes in the ant family, and their elongate bodies are similar in shape to the bodies of Myrmecia. While some Tetraponera can grow quite large and be rather aggressive, like the Southeast Asian Tetraponera rufonigra, I can't find evidence that there is a Tetraponera that big in West Africa.

In many parts of the world, especially in the tropics, if a medium-large ant has just painfully stung you, there's a good chance it belongs to the genera Pachycondyla or Odontomachus. These don't bear a specific resemblance to Myrmecia (Odontomachus does have elongate mandibles, but they are attached near the midline of their faces, rather than at the corners as in Myrmecia, Plectroctena, and Leptogenys), but they might be more common in some places than other genera mentioned in this post.

Good luck! Feel free to send us pictures if you see an ant like that again!
best,
Jesse Czekanski-Moir & the AntAsk Team

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