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« 2010 Insect Fear Film Festival: Prehistoric Insects
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The eggs that weren’t

January 28, 2010 by myrmecos

I did not expect everyone to nearly instantaneously solve yesterday’s termite ball mystery.  I’m either going to have to post more difficult challenges (from now on, nothing will be in focus!) or attract a slower class of reader.

Cuckoo fungus grows in a termite nest.

As you surmised, those little orange balls are an egg-mimicking fungus. It is related to free-living soil fungi, but this one has adopted a novel growth form that is similar in diameter, texture, and surface chemistry to the eggs of Reticulitermes termites. These hardened sclerotia are carried about the termite nest as if they were the termite’s own offspring, earning them the title “Cuckoo fungus”. Since termites are blind there is no advantage to the fungus in visually looking like an egg, though, so we sighted creatures can tell the difference at a glance.

For more about the Cuckoo fungus, check out the publications of Kenji Matsuura. Matsuura first identified the balls as a fungus ten years ago, as a graduate student, and has been working on them ever since.

Termites can't tell the difference between their own eggs (white) and the fungal sclerotia (orange).

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Posted in Nature, Science | Tagged ecology, Evolution, fungus, mycology, Parasites, termites | 4 Comments

4 Responses

  1. on January 28, 2010 at 1:43 pm wildwoodflwr

    If it makes you feel any better, I had no clue.


  2. on January 28, 2010 at 6:49 pm JasonC.

    Well, if they’re only mimicking eggs, what are they going to eat and how would they reproduce?


  3. on January 29, 2010 at 10:47 am jason

    I’m with wildwoodflwr: I didn’t have a clue what they were.


  4. on January 30, 2010 at 7:17 pm The Geek In Question

    Me three…I had no idea…

    but I’ll never forget now! What a cool story!!!



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