Category: Bug of the Week (Page 184 of 218)

Rocks Flipped in Sonoran Desert

Because we were eager to participate in International Rock Flipping Day, we peeked under some rocks in our yard this morning.

Flipping rocks was somewhat disappointing at first. It has been the third driest summer on record in central Arizona, and because the summer is when we normally get most of our precipitation, we are really dry. The terms dry as a bone, parched, and desiccated come to mind.  Most of the rocks we looked under would normally have isopods (rolypolies), ants or earwigs, but we didn’t see any of those. Occasionally we might see a scorpion. We didn’t see any of those either.

What we did find was this:

Any ideas what might cause these white tunnels? I’ll give you a hint:  it isn’t a type of spider, although it is made of silk.

In fact, the tunnels are made by an insect. Here are some photos I took of one earlier this summer.

Does anyone remember what it was?

(If you want to find out the answer, check this previous post.)

All in all, we saw something we wouldn’t have otherwise seen, and realized how much the lack of rain is changing the environment for even tiny things that live under rocks. And best of all, we got outside and had some fun.

What did you find?

Bug of the Week: Cixiids

Did anyone figure out why the cricket was pale in color in last week’s post? The answer was that it had just shed its skin or molted. Newly molted insects are often pale in color until their exoskeleton hardens up.

This week’s insect is a bit mysterious as well.

When I worked for The University of Arizona, part of my job was answering questions about insects and plants. I was always getting the question, “What’s this white fuzz on my plants?”

cixiidae eggs

The answer is that a tiny insect called a cixiid (family Cixiidae, pronounced roughly six-ee-iday) in the planthopper group has laid its eggs here. The female insect inserts her eggs and then covers them with a whitish waxy fuzz.

Invariably I would get puzzled looks because no one had ever seen one or even ever heard of these insects before. And why hadn’t they ever seen the immature insects that hatched out? Wouldn’t they be on the plant too? Some people probably thought I was making this up 🙂

The reason you don’t see the immatures is because they fall to the soil when they hatch from the eggs. The nymphs burrow into the soil where they feed on plant roots. Does this sound familiar? Their life cycle is similar to that of cicadas.

In fact the adult insects look a little like tiny cicadas, although they also might be mistaken for flies. After trying to get a photograph of one for a long time, yesterday I finally succeeded.

cixiidae

So, have you ever seen a cixiid?

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