Tag: Bug of the Week (Page 5 of 11)

Bug of the Week: Discoveries

Bug of the week this week shows what you can discover if you only look.

I started out looking at some old agave flower stalks we had saved in the back yard. (It is a cloudy day today, so some of the photographs turned out a bit dark.)

agave flower stalk

Then I noticed a hole under one of the branches.

carpenter bee entrance hole

It an entrance hole. Inside is where a female carpenter bee had made her nest. I knew the bees were long gone and I was curious so I peeked inside.

carpenter bee nest

It was surprisingly clean inside, although you can see the brown marks where the nest chambers had been.

carpenter bee nest

More tunnels.

The female carpenter bee that excavated these tunnels might have looked like this one from a photograph I took earlier this year:

carpenter bee

Carpenter bees collect nectar and pollen from flowers to make into a mixture called beebread. The female bee places the beebread within the chambers within the agave stalk and then lays an egg on it. The bee grub hatches and feeds on the beebread within the protected nest.

Now the chambers are home to some other insects, however.

While I was taking photographs I noticed this caterpillar.

caterpillar

It looks a bit strange because it is nearly ready to pupate. I found two pupae nearby.

pupa

I am not sure what kind of moth it is.

When I was looking at the photos I noticed another insect, too. Can you spot it in front of the caterpillar?

pink caterpillar

Here is a closer look.

book louse

This tiny little insect is called a psocopteran, or more commonly a barklouse. You don’t see them very often because they are small, and spend much of the time in cracks and crevices of bark, or under rocks in the soil.

Isn’t it amazing what you can find with just a few minutes and a camera?

Bug of the Week: Ants Visiting Extrafloral Nectaries

It is cold (for us) and windy this morning, and I wasn’t sure I’d be able to find a bug of the week. No fear, there’s always something going on in the insect world.

barrel cactus

First I checked our barrel cactus, which is covered with yellow fruit.

barrel cactus

As I got closer, I spotted a beige patch near the base of one of the fruit towards the right/center of the photograph. You’ll be able to see it more clearly in the next photograph.

cactus

The biege patch looked soft and furry, with some yellow and orangish bumps.

ants at extrafloral nectaries

Ants were visiting those bumps in a purposeful way. First they would arrive looking slender.

ants at extrafloral nectaries

After spending some time with their heads near the bumps their hind portion, called a gaster in ants, would start to swell up.

ants at extrafloral nectaries

These ants are feeding at the extrafloral nectaries of the cactus. Nectaries are parts of a plant that produce the sweet juicy nectar. Many are found inside the flower of the plant. These structures are called extrafloral because they are outside of the flower.

Why does a cactus supply liquid sweets in the form of nectar to ants, especially in the desert where water is in short supply? There are several theories, including that ants increase the fertility of the soil around their mounds and ants are more likely to nest nearby when food is available, and/or that ants feed on insect pests while on the cactus. In any case, it is a fascinating example of just one of the complex relationships between ants and plants.

Thinking of sweets makes me want to have a cup of hot chocolate…

Ant Mandibles

A question just came in about what ant mandibles look like. Now this might not be something you think about every day, but it really is an interesting topic. I remembered a wonderful website that discusses all the things that ants do with their mandibles and shows some fantastic close up photographs of different species. I do have to warn you, however, it is written for adult scientists. The site is called Diversity of Ant Mandibles.

For a more child-friendly general discussionof insect mouthparts, check my recent post on the topic.

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