Category: Bug of the Week (Page 136 of 219)

Bug of the Week: Life Cycle of a Moth

It is easy to find photographs of butterfly life cycles because butterflies are bright, colorful and active during the day. People like them.

Moths, on the other hand, are commonly drab, secretive and fly mostly at night, so not as much is available.

This is what the typical adult moth looks like.

Some moths can be quite colorful, however, so color is not the only factor to consider. Another feature of moths is that their bodies are often thicker than that of butterflies, and the thorax area in particular may be covered with hair-like scales (illustration from Wikimedia). Therefore, moths look fuzzy.

The adult moths lay eggs. The size and shape will depend on the species of moth. These are silkworm eggs.

The yellow eggs on the leaf above were laid by an Io moth, Automeris io (Photograph by Gary Foster at Wikimedia).

The eggs hatch into larvae, commonly called caterpillars.

The caterpillar shown here is a type of cutworm. Moth larvae are essentially just like butterfly larvae.

Moth pupae, however, are quite different from butterfly pupae. Often moth larvae construct a bag made of silk, called a cocoon, and then pupate inside it. The pupa itself is plain reddish-brown.

Other moth larvae excavate underground chambers and pupate in the soil.

Butterfly pupae, in contrast, are called chrysalids and sometimes form colorful and elaborate shapes. They are often found attached to plants.

For another view of a moth life cycle, try this post about silkworms.

Although moths are often ignored, they are on the order of ten times more numerous than butterflies. That means that for every butterfly you see flitting about your yard, there may be ten species of moths hidden away. Something to think about…

Bug of the Week: Scorpions

Usually scorpions are active at night.

Once in awhile, however, you can spot one during the day.

This is a youngster. I can tell by its size.

Scorpions look very different from their relatives, the spiders.

(Line drawing from Wikimedia Commons)

The parts of a scorpion are not always easy to identify. For example, how many legs does a scorpion have? Does it have eight legs (as it should since it is supposed to be an arachnid), or does it have ten? What do you think after looking at the photographs and line drawing?

Answer:  Those two pincher-like appendages at the front are called pedipalps and are not considered to be legs. Therefore a scorpion does have eight legs.

Another feature of scorpions is that they don’t have distinctly separate body regions.

Perhaps this colored diagram will make it easier. In this case, the legs are colored  light green and the pedipalps are blue. The dark green area is the “head” region (called the cephalothorax). Do  you see the black dot that seems to be in the middle of the “head” region in the photographs above? Those are the median eyes, shown as red dots labelled “O” here. The scorpion also has lateral eyes on the front sides of its “head,” which you can see in the photographs. The darker blue appendages are the chelicerae, which are mouthparts.

The middle part of the scorpion is colored yellow and is called the mesosoma. The tail, colored in pink, is the metasoma. Finally, the business end is the bright red telson that contains the stinger.

Why do scientists identify and name the various parts? One important reason is to be able to describe characteristics of different species (and higher groups) accurately so that others are able to tell them apart, too.

Bet you didn’t think you would be looking this closely at a scorpion today. 🙂

Do scorpions occur where you live?

If you are interested in finding out more, try the middle-grade book Scorpions: Armored Stingers by Sandra Markle (link takes you to a review at Wrapped In Foil).

Reading level: Ages 9-12
School & Library Binding: 48 pages
Publisher: Lerner Pub Group (T) (March 2011)
Language: English
ISBN-10: 0761350373
ISBN-13: 978-0761350378

Scorpions: Armored Stingers (Arachnid World)

(Amazon affiliate link)

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