An Introduction to the

World of Invertebrat

es

I CAN & Focus Question

I CAN Statement: I CAN identify characteristics of invertebrates through an observational gallery walk.

Focus Question: How can we classify invertebrate animals?

Brainstorm/Warm-up

Today we will continue to learn how to classify animals. Just to get your minds going, you’ll have one minute to write down as many animals as you can think of on the index card.

Ask Scholars: (after recorded answers on T Chart) What does it mean to classify? What was the criterion for grouping the animals? What is the key difference between vertebrates and

invertebrates? What are the five major vertebrate groups? What are some examples of each group?

Vertebrates vs. Invertebrates

Invertebrates Vertebrates0

20

40

60

80

100Percent of animals in the world

Percent of ani-mals in the world

*Are there more vertebrates or invertebrates in the world?

*About 95% of the animals on earth are invertebrates and only 5% are vertebrates.

*If there are more invertebrates in the world, why do you think we wrote down mostly vertebrates?

Invertebrate Basics!

Invertebrates do not have a backbone or spine.

All invertebrates are cold-blooded

6 major groups: Porifera Cnidarians (c is silent) Worms (not scientific name) Mollusks Echinoderms Arthropods.

What’s in the Invertebrate Gallery?

In a moment, you will participate in a Gallery Walk for Invertebrates!

There are six stations setup in the classroom (porifera, cnidarian, worms, mollusks, echinoderms, and arthropods).

Each station contains pictures of various animals classified under each invertebrate group.

Your Task: Is to rotate through each center, observe different invertebrates and record your observations on your chart.

You will have 3 minutes at each station.

 

Ask Scholars: *What were some animals that you saw in each phyla/class? *What were some observations of each phyla/class? ?

Closure: Exit ticket

OPTIONAL STUDYJAM

SCHOLARS WILL WRITE3 things you discovered

2 interesting things1 question you still have

http://studyjams.scholastic.com/studyjams/jams/science/animals/invertebrates.htm

I CAN & Focus Question

I CAN Statement: I CAN identify characteristics of invertebrate animals and classify them into six major groups.

Focus Question: How can we classify invertebrate animals?

SCHOLARS Copy I CAN statement and Focus Question to

notebook.

Symmetry

Asymmetrical(No symmetry)

Radial(round or circular shape)

Bilateral(even on both sides)

Poriferans

No tissues or organs: simplest animals

Most live in salt water attached to sand or rocks.

Their bodies are full of pores and have canals which water flows through giving it nutrients and oxygen.

Do not move around, stay fixed in one place: SESSILE

Asymmetrical (No symmetry)

Examples: Sponges

Cnidarians

Cold-Blooded Invertebrates

More complex than sponges: tissues, a gut for digesting food, and a nervous system BUT no organs.

Tentacles with stinging cells called NEMATOCYSTS used to feed on animal.

They come in two body shapes:

Polyp: sessile and vase-shaped

Medusa: free-swimming and bell-shaped

Radial symmetry

Examples: Corals, Hydras, Jellyfish

Poriferans and Cnidarians

Watch Video: (11mts)

Watch Video: (3:30-5:12)

https://www.youtube.com/watch?v=DuQcmpHZ9tQ#t=436

http://www.ghanatubes.com/view/104/animals-around-us-invertebrates-what-are-they/

T Chart: Poriferans and Cnidarians

 

Poriferans Cnidarians

Closure: Lab Notebook

SCHOLARSIn a few sentences, write what you learned

about Poriferans and Cnidarians in your lab notebook.

I CAN & Focus Question

I CAN Statement: I CAN identify the characteristics of annelids and arthropods.

Focus Question: What are the characteristics of annelids and arthropods?

SCHOLARSCopy I CAN statement and Focus Question to

notebook.

AnnelidsAnnelids are segmented worms that do not have

legs.

They have long tube-shaped bodies that are divided into a series of rings.

Earthworms burrow through and live in wet soil or water and eat vegetation.

Leeches are parasites that feed on small invertebrates (earthworms) or human blood.

Bilateral symmetry

Examples: Earthworms, Leeches, Clam worms

Arthropods

• They have jointed legs and a segmented body.

• Their body is divided into three parts: head, thorax, and abdomen.

• Largest group of animals on earth: insects

Examples: Insects, Arachnids, Lobsters, Shrimp, Centipedes, Millipedes

Arthropods cont….

• Arthropods bodies are protected by a hard outside covering which sheds as they grow: EXOSKELETON

• They have digestive and nervous system

• Some arthropods use camouflage to blend into their habitat

• Bilateral symmetry

Annelids and Arthropods

Watch Video: annelids

Watch Video: arthropods

https://www.youtube.com/watch?v=Xmtdm-tfnCA#t=55

https://www.youtube.com/watch?v=2bBHKHhgjeM

T Chart:

 

Annelids Arthropods

Closure: Lab Notebook

SCHOLARSIn a few sentences, write what you learned

about Annelids and Arthropods in your lab notebook.

I CAN & Focus Question

I CAN Statement: I CAN identify the characteristics of mollusks and echinoderms.

Focus Question: What are the characteristics of mollusks and echinoderms?

SCHOLARS Copy I CAN statement and Focus Question to

notebook.

Mollusks

Soft bodies which is sometimes protected with hard shells. (Octopus does not have shell)

They breath through lungs or gills and have organs

Some with tentacles or arms with suction cups

They live on land and in water

Bilateral symmetry

Examples: Snail, Oyster, Clam, Squid, Octopus, Slug

Echinoderms

• Bodies covered with spiny skin outer covering

• They have bodies with at least 5 sections

• They have suction cup tube feet to walk

• Radial symmetry

Examples: Starfish, Sea Urchins, Sea Cucumbers, Sea Dollars

Mollusks and Echinoderms

Watch Video: (6:20-8:20)

Watch Video: Mollusks

Watch Video: Echinoderms

http://www.ghanatubes.com/view/104/animals-around-us-invertebrates-what-are-they/

http://www.ghanatubes.com/view/104/animals-around-us-invertebrates-what-are-they/

http://www.schooltube.com/video/f880c67b5ec743e5ac41/Mollusks%207

T Chart: Mollusks and Cnidarians

 

Mollusks Echinoderms

Closure: Lab Notebook

SCHOLARSIn a few sentences, write what you learned about Mollusks and Echinoderms in your lab

notebook.

I CAN & Focus Question

I CAN Statement: I CAN demonstrate my understanding of classifying invertebrate animals into six groups.

SCHOLARSCopy I CAN statement to notebook.

Invertebrate Animal Groups Poster Activity

MATERIALS½ sheet of chart paperMarkers, crayons

PROCEDURESDivide class into 6 groups and assign each group one of

the animal groups.Have members in each group make a poster that list

the characteristics of their animal group. Then have members of each group draw and color

illustrations of animals in their animal group.Have each group present their poster to the class and

discuss ways the animals are alike and different.

Closure: Lab Notebook

SCHOLARSIn several sentences, write what you have

learned about classifying invertebrate animals.