Invertebrate Classification - PowerPoint Presentation

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Invertebrate Classification

Year 7 Classification2015Slide2

Quick Quiz

How many kingdoms exist in the living world & what are their names?Name the classes the following animals would fit intoKookaburra Dolphin Alligator Snapper SalamanderWhat does the word Amphibian mean?True or False – Amphibians are endothermicSlide3

Quick Quiz

What is a characteristic of reptilian eggs?What is the Latin name for the Bird Class?What sub–class do Sharks fit into?What sub-class do Lampreys fit into?What sub-class do Tuna fit into?

What are the three groups of mammals and give an example of each type of mammalSlide4

Invertebrates

Invertebrates are animals that do not have a backboneThey are found in every type of habitat, but the largest number are found in the oceansIt is thought the invertebrates were the first animals to evolve. There is fossil evidence of invertebrates as old as 600 million yearsSlide5

Invertebrate Sub-Phyla

There are 8 main phyla of animals without a backbone that we will look at:CnidariansNematodesAnnelidsPlatyhelminthesPoriferans (Sponges)Arthropods

Molluscs

EchinodermsSlide6

Cnidarians

Pronounced – “nid-air-ee-ans”Some characteristics of all cnidarians are They have stinging cellsTheir body is shaped like a bag

They have only one opening for food entry and waste

removal

Radial symmetry

There are two classes of Cnidarians

Attached bodies – POLYPS

Free-swimming bodies - MEDUSASSlide7

Cnidarians

Examples include Jellyfish, Coral Polyps and Sea Anenomes.There is almost 10 000 different speciesSlide8

Worms

There are three different phyla of wormsNematodes (Round worms)Platyhelminthes (Flat worms)Annelids (Segmented worms)Worms can be either free-living or parasiticThey can live in most habitats in the world, with a large number living in waterSlide9

Worms

The largest worm is the South African Giant Earthworm which can grown to 1.3m long

Parasitic worms like the hook and round worm often live inside the bodies of humans!Slide10

Porifera

Sponges are the simplest animals, they have no eyes, ears, nerves or brain but are still animalsSlide11

Arthropods

Arthropods form the largest phylumIt holds about 75% of ALL known animals in this phylumThey are found all over the world in all habitatsCharacteristics includeSegmented bodiesPaired jointed limbs

Exoskeleton (an outside/external skeleton)Slide12

Arthropod Classes

There are 5 major classes of ArthropodsInsectsCentipedesMillipedesArachnidsCrustaceansSlide13

Insects

There are at least 1 million different species of insects in the world. The exact number is unknown.All INSECTS haveOne pair of antennaeA body divided into three segments (head, thorax & abdomen)6 legs (three pairs) located on their thoraxSlide14

Centipedes & Millipedes

Centipedes Have segmented bodiesOne long pair of antennaeFlat bodyOne pair of legs on each segmentMillipedesHave segmented bodies

One short pair of antennae

Rounder body

TWO pairs of legs on each segmentSlide15

Arachnids

Spiders are the most familiar example of the Arachnid classScorpions, Mites & Ticks are also ArachnidsCharacteristics include8 legs (4 pairs)No jaws or antennaeSlide16

Crustaceans

Crustacean means “Crusty-Case”They include animals such as crabs, lobsters, prawns, shrimps, krill & barnaclesMost crustaceans live in the water, with the exception being the woodliceCrustaceans have 2 pairs of antennaeThere are more than 40 000 different species of crustaceansOften called the “insects of the sea”Slide17
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Molluscs

Molluscs make up the second largest phylumMost live in the water but there are a few species that live on landCharacteristics includeA soft body, sometimes covered with a shellWell developed internal organsBilateral symmetry Muscular ‘foot’ for movementSlide22

MolluscsSlide23

Echinoderms

Echinoderms - their name means ‘Spiny Skinned’All echinoderms live in waterThey all show radial symmetryExamples includeStarfish

Sea Urchins

Sea Cucumbers

Brittle StarSlide24