1t Bricks chapter 4 invertebrates: arthropods

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Kingdom of the Animals

Part 2: Myriapods, Crustaceans, Arachnids, Insects

Welcome to this lesson!

• Today, we will discuss 4 new animal groups in the kingdom of animals
• We will also look back on the groups from
  last week
• In the next few slides, you will find some 
  questions about last weeks lesson

What do sponges do to catch food?

1. They swim after it
2. They filter water
3. They wait for it to swim by and grab it
4. They have specialized cells with electric pulses

What type of skeleton do Cnidarians have? Explain a bit about how it works

What type of skeleton do molluscs have?

1. a kind of a shell
2. Endoskeleton
3. Hydroskeleton
4. Exoskeleton

How do Echinoderms move around?

And now the arthropods!

• Myriapods, 
• Crustaceans, 
• Arachnids 
• Insects

Arthropods

• Arthropods are invertebrates
• They have an exoskeleton
• They have segmented bodies and legs 
• Some of them have antennae on their heads
• Because of the exoskeleton, they cannot grow easily (since the exoskeleton does not grow)
• For this reason, they have to get rid of the exoskeleton and then develop a new, bigger one. We call this moulting or shedding

Segmented: this means that their body is divided into different parts. Most often, you can very clearly see the different parts.

Myriapods

• 10 or more pairs of legs
• Very segmented (each segment has 1 or 2 pairs of legs)
• Centipedes: pair of poison fangs, carnivores
• Millipedes: herbivores

Myria = many

Pods = legs

So, Myriapods means 'many-legged'

In Dutch, we call them 'veelpotigen'

Crustaceans

• Between 4 and 20 pairs of legs
• Live in water, but can come onto land (they have gills)
• Often, their legs look very different from each other (front vs back legs)

In Dutch, we call them 'Kreeftachtigen'

Arachnids

• 2 main body parts
• 4 pairs of legs attached to front part
• Spiders, ticks, mites and scorpions
• Can be venomous!

Insects

• 3 main body parts: head, thorax, abdomen
• 3 pairs of legs + 1 or 2 pairs of wings attached to thorax
• Can have antennae

Insects

Insects perform metamorphosis, which means that they have 2 stages during life:

1. Larvae or nymphs

2 Adult stage

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Why do we need bees? (and other insects)

• I can imagine why you would find insects annoying, creepy, or ugly
• However, they do have a very important job
• See the next video for that!