InvertebratesInvertebrates1. Invertebrates have no ______________

2. They make up ______% of the animal kingdom.

3. There are ______ groups

3. They are _________cellular.

4. Their nutrition is __________.

5. Their reproduction is _________.

What will talk about in the next weeks?1. What are the different groups of invertebrates?2. What are the characteristics of these groupsnutritionreproductionhabitatscientific name3. Evaluation: At the end we will have an exam

Group 1 SpongeScientific name: Porifera

A Sponge never moves. It stays in the same place all its life.It reproduces sexually. The male and female release the sperm and ova into the water to make a new sponge.It lives in salt-water, in the seas and oceans all around the world.

How does it feed?Look at the diagram. Water moves through the holes. The sponge takes the nutrients and then the water leaves the sponge.

http://www.youtube.com/watch?v=T7E1rq7zHLc

Group 2: Coral, hydras and jellyfishScientific name: Cnidaria

What do they all have in common?1. They all can sting, and the jellyfish is sometimes toxic to humans2. They hunt their food. They catch it in their tentacles and then eat it.3. The have one hole that serves as a mouth and anus!What are the differences?Hydra and coral do not move, jellyfish can move.Hydra have asexual reproduction-buddingJellyfish and coral use sexual reproductionJellyfish and Coral live in warm seas, hydras live in ponds

JellyfishTentaclesTentacles

One hole-mouth and anusOne hole-mouth and anus

Group 3 Worms-divided into threeGroup 3a Segmented wormsScientific name : Annelid

These worms' bodies are formed of ring like segments-earthwormThey are hermaphrodites-they can be both male and femaleThey have a head and a tail, and their body is moist to help movementThey eat decaying plants and animals.They live in the ground

Why are they important?

SegmentsSegments

HeaHeadd

TailTail

Group 3b Round wormsScientific name: Nematoda

These worms cannot move very wellThey taper to the end They reproduce sexuallyAll in the pictures are parasites, they live in other plants or animals, including humans

Parasite

A worm A worm living in living in someones someones eyeeye

This is a tape worm. It was This is a tape worm. It was living in a cow's intestineliving in a cow's intestine

Group 3c Flat wormScientific name: Plathhelminthes

These are the most primitive of the wormsThey reproduce sexuallyMost have a mouth but no anus!Most of this group are parasites.

This is a liver This is a liver fluke. They fluke. They are very are very dangerous to dangerous to farm animalsfarm animals

These worms live in the seaThese worms live in the sea

Group 4 Sea Urchin and Star Fish Scientific name: Echinoderms

These animals are fixed or they move very slowly. They have spines to protect themselves.They lived in salty water. They do not have a head, and the mouth is on the underside.They are carnivorous and eat small crustanceans or molluscs. The reproduce sexually, by eggs and some species are hermaphrodite.

Mouth on Mouth on undersideunderside

Spines for Spines for protectionprotection

Starfish eating

Army of Sea Urchins -

From one leg, a star fish From one leg, a star fish can regenerate his can regenerate his whole body!whole body!

Group 5 MolluscsEvery mollusc has these similarities: A head-it contains head and eyes and mouth A body with all the main organs A foot which helps them move aboutThey can be carnivores or herbivoresThey reproduce sexually, with eggs. They are also hermaphrodite.Most have a shell of one or two valves

Head and eyesHead and eyes

ShellShellFootFoot

There are three groups.

1.1. GastropodsGastropods-slugs, snails and sea snails. They have a shell, except the ______

2.2. BivalvesBivalves-clams, cockles, mussels. Their shell has two valves.

3.3. CephalopodsCephalopods-squid, cuttlefish and octopi. They have tentacles, but no_______

Shark vs. Octopus

Quagga Mussels Feeding

giant slug eats flower

Group 6: Arthropods

Scientific name: ArthropodsWhat do they have in common?

Their segmented body is divided into three parts-head, thorax and abdomen.

They all have antennae on their head

They reproduce sexually by eggs.

They moult-this means their old skin falls off and they then grow a new one.

Each group has its own characteristics

How many groups are there?

Group Examples Body HabitatCrustanceans legs

Myriapods centepede worm-like, many legs

Anrachnids legs

Insects legs, antennae2 or 4 or no wings

Some videos on Arthropods

YouTube - A Huge Centipede Fighting A Snake YouTube - BIG spider - tarantula on my hand