Category: Bug of the Week (Page 164 of 219)

Bug of Week: Cicada Nymph

Here’s a bug you don’t see much this time of year.

My son dug up this pea-sized grub when trying to fix an irrigation leak.

When it is upside down you can see the beak it uses to feed on tree roots. It is so tiny, that is a bit of acacia flower next to it.

In this view you can see the claws on the front legs that it uses to dig through the soil.

Perhaps next summer it will crawl from the earth, attach to the side of a tree, emerge as an adult, and leave its exoskeleton behind like this one did.

For more information on cicadas:

Another sequence of cicada nymphs

Adult cicada

Cicada wasp with adult cicada photograph from this species

Bug of the Week: Chrysalises

This week all the caterpillars from the last two weeks have disappeared. But don’t be sad, because now they are chrysalises.

The queen butterfly forms within this delicate green structure with gold beading. It looks a lot like the monarch butterfly chrysalis.

I am happy to report the queen butterfly from this chrysalis successfully emerged and flew away.

The orange dog caterpillar formed a chrysalis that would be well camouflaged on the bark of the tree.

This one is still transforming inside.

What about the tobacco hornworm? It has formed a pupa, but it is hard to show you because hornworms pupate in the soil.

Related Activity:  Investigate where butterflies and moths spend the winter.

Different butterflies and moths may spend the winter as eggs, larvae, chrysalises, cocoons or adults. See if you can find some of these.

Bug of the Week: Tobacco Hornworm

Add another caterpillar to Caterpillar Central from last week.

We found this brave caterpillar is feeding on a jalapeno pepper plant.

It is the tobacco hornworm, Manduca sexta, often confused with the tomato hornworm (Manduca quinquemaculata). The tobacco hornworm has straight white lines on its sides. The tomato hornworm has V-shaped markings.

It gets its name “hornworm” from the thorn-like projection at the rear of the caterpillar. The horn is not dangerous in any way. The caterpillars are perfectly harmless, except to plants.

Notice its three pairs of true legs right next to the head. The rest are fleshy prolegs.

When it finishes eating, the larva will drop off the plant and dig into the soil to pupate. The adult moth is called a hawkmoth or sphinx moth. It flies at night and isn’t seen much during the day.

Tobacco hornworms are easy to raise and are great subjects for science activities with children.

The University of Arizona’s Manduca Project website has a wealth of information about the life cycle, techniques for rearing Manduca, lesson plans (including cool science projects) and videos. Go check it out!

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