sea creatures - blue rayed limpet

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    Sea Creatures

    Blue Rayed Limpet

    Presented by Ginny P6

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    Oceans stretch from the north pole to the southpole, all around the globe.

    They cover more than 70 percent of the Earth'ssurface

    Oceans hold more than 300 million cubic miles ofwater.

    Scattered through these great waters are manysea creatures.

    Introduction

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    Limpets are Molluscs The word mollusc means soft in Latin and describes the

    soft bodies of these sea animals.

    The body of molluscs are all different but they normallyhave a head with eyes, tentacles, a muscle foot and a

    body containing organs.

    They often have a shell to protect their soft bodies.

    Molluscs found in the sea include the bivalve shells (likescallops), sea snails, sea slugs and limpets.

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    Blue Rayed Limpet If you look very

    closely at a type ofseaweed calledoarweed you mightbe lucky enough to

    find the beautifulblue rayed limpets.

    These limpets live insmall groups andslowly chew theirway into seaweed.

    Helcion pellucidium (Linnaeus)

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    OarweedOarweed is a large

    brown seaweed whichcan grow up to 4m long.

    It is also calledtangleweed.

    DID YOU KNOWOarweed was at one time a popular foodin Scotland and Ireland.

    Holdfast (Root)

    Frond (leaves)

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    Blue Rayed Limpets on Oarweed

    The limpet migrates

    down to the oarweed

    holdfast when itgrows older; its shell

    becomes thicker andthe colours fade.

    PhotographerPeter Barfield Copyright Peter Barfield

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    2 Different Types

    1. The frond limpet is a transparentshell covered in bright blue, brokenlines.

    2. The shells of the holdfast limpets

    are brown with less noticeable, bluelines and reddish brown lines aswell.

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    Dark Brown Shell

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    Other information - Blue Ray Limpets

    Habitat

    Found on rocky shores

    Other Features Oval-shaped shell.

    Up to 2 cm in length

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    Eating Kelp PhotographerFiona Crouch Copyright Fiona Crouch

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    Reproduction The female limpets lay their eggs. Male limpets

    fertilize the eggs.

    The eggs are then carried away by the currents.

    The eggs hatches and is joined to plankton.

    At this stage, the larva is feeding on microscopic

    algae.

    Later on in the year the larvae settle on the oarweedand mature into adult limpets.

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    Other Limpets When the tide is out most limpets

    are clamped tightly to rocks.

    At high tide, though they go onfeeding trips and eat lots ofdifferent seaweeds by using theirscraping tongue called a radula.

    Common limpets leave a slimytrail to help them find their way

    back home.

    Limpets are preyed on by birds,crabs, starfish and whelks butthey are not completelydefenceless.

    If they are scared of a starfish, thecommon limpet can raise its shelland rock from side to sidesometimes suddenly smashingthe edge of the shell down ontheir enemy.

    They live for 4-17 years.

    Important Differences1. Ribbed, conical shell.

    2. Outer shell surface whitish-grey or fawn

    3. Inside is greenish blue or yellowish.4. Up to 7 cm in length.

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    Where I got my information1. http://www.utopie.it/seashorecentre/seashore_wildlife/molluscs.htm

    2. http://www.flora.org.gg/Patpel2s.jpg

    3. http://www.macduff-aquarium.org.uk/fishfinder/ff_kelp.html

    4. http://www.offshorewindfarms.co.uk/Pages/Education/Life_around_the_turbines/Seaweeds/Oarweed/

    5. http://www.snh.org.uk/publications/onine/livinglandscapes/kelp/oarweed.asp

    6. http://www.scran.ac.uk/database/record.php?usi=000-000-617-759-C

    7. http://creationwiki.org/Limpet

    8. http://www.medinavalleycentre.org.uk/field_studies_outdoor/resources_marine_biology_bembridge_marine_life.aspx

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