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Invertebrates

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Information about Invertebrates
Education

Published on February 25, 2011

Author: jrabuin

Source: slideshare.net

Description

Presentation for scholars of secondary school about invertebrates, including the main groups and characteristics. For CLIL.
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INVERTEBRATES Small animals which live with us

Porifera The body is like a sack full of pores and channels. Water circulates through it, and the cells get the small plancton. Porifera don’t have one skeleton. Instead, they have a lot of small and tough pieces, called spicules. They live attached to a surface

The body is like a sack full of pores and channels.

Water circulates through it, and the cells get the small plancton.

Porifera don’t have one skeleton. Instead, they have a lot of small and tough pieces, called spicules.

They live attached to a surface

 

 

Cnidaria They have a soft body and a mouth surrounded by tentacles. There are two body types: polyps and medusae (jellyfish). Polyps live attached to a surface.

They have a soft body and a mouth surrounded by tentacles.

There are two body types: polyps and medusae (jellyfish).

Polyps live attached to a surface.

Jellyfish float in the sea

 

They have a complex life cycle, while you can see in this picture…

They have a complex life cycle, while you can see in this picture…

 

Worms There are many types of true worms. This is not a worm

There are many types of true worms.

This is not a worm

Nor this.

Nor this.

 

All these animals are larvae of insects…

All these animals are larvae of insects…

These , instead, are really worms

These , instead, are really worms

 

They have a soft body and no skeleton.

They have a soft body and no skeleton.

Platyhelminthes They have long, flat and soft bodies…

They have long, flat and soft bodies…

Some of them are parasitic… Not all.

Some of them are parasitic…

Not all.

Nematodes They have cylindrical bodies, not divided into segments, …

They have cylindrical bodies,

not

divided into segments, …

Not like this…

Not like this…

Annelids They have a soft, cylindrical body, but divided into segments, …

They have a soft, cylindrical body,

but

divided into segments, …

This group have three small groups a bit differents: Leeches, With no hairs or chetae in its skin…

This group have three small groups a bit differents:

Leeches,

With no hairs or chetae in its skin…

 

Oligochaeta, worms with small groups of chetae or hairs over its skin, like the earthworm

Oligochaeta,

worms with small groups of chetae or hairs over its skin,

like the earthworm

 

And polychaetes, sea worms with a lot of hairs, usually at the top of small limbs

And polychaetes,

sea worms

with a lot of hairs, usually at the top of small limbs

Molluscs They have a soft body divided into three parts: head , body mass and foot.

They have a soft body divided into three parts: head , body mass and foot.

They breathe through gills… (Aquatic)

They breathe through gills…

(Aquatic)

But some breathe through lungs… (terrestrial)

But some breathe through lungs…

(terrestrial)

And they go through metamorphosis

And they go through metamorphosis

 

There are three main groups of molluscs: Gasthropoda, without or with a spiral shell, terrestrial or aquatic

There are three main groups of molluscs:

Gasthropoda, without or with a spiral shell, terrestrial or aquatic

 

Bivalves, with a shell, with two valves, ever aquatic

Bivalves, with a shell, with two valves, ever aquatic

 

Cephalopods, with an internal shell, or without it, and the foot divided into tentacles

Cephalopods, with an internal shell, or without it, and the foot divided into tentacles

 

Arthropods They have jointed legs and an external skeleton. Their bodies are divided into three parts: head, thorax and abdomen.

They have jointed legs and an external skeleton.

Their bodies are divided into three parts: head, thorax and abdomen.

And they can undergo metamorphosis

And they can undergo metamorphosis

 

Some have the head join to the thorax forming a cephalothorax Like the crustaceans and the arachnids …

Some have the head join to the thorax forming a cephalothorax

Like the crustaceans and the arachnids …

Arthropods The Crustaceans live in the sea. Some form one important part of the zooplancton, that feed the fisheries.

The Crustaceans live in the sea.

Some form one important part of the zooplancton, that feed the fisheries.

 

The arachnids are not ever like this animal …

The arachnids are not ever like this animal …

 

Others had only the head and the trunk… The myriapoda

Others had only the head and the trunk…

The myriapoda

 

Finally, we have in this group the most beautiful arthropods.

Finally, we have in this group the most beautiful arthropods.

The insects

Some undergo metamorphosis, Others not. Some have wings, Others not. Some are common, Some are strange…

Some undergo metamorphosis,

Others not.

Some have wings,

Others not.

Some are common,

Some are strange…

 

Echinoderms They have an internal skeleton made up of plaques under their skin. They breathe through their skin, using the ambulacral apparatus. They undergo metamorphosis.

They have an internal skeleton made up of plaques under their skin.

They breathe through their skin, using the ambulacral apparatus.

They undergo metamorphosis.

 

There are five groups of echinoderms. It could be that you know two of them… The starfish or asteroidea…

There are five groups of echinoderms.

It could be that you know two of them…

The starfish or asteroidea…

The Sea urchins or echinoidea

But in this group we have too,… the ophiuroidea or brittle stars

The Sea lilies or crinoidea

And finally, the sea cucumbers or holothuroidea

We have finished this presentation but now you can find… The Sea Adventure

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