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Phylum Echinodermata (Means spiny skin). Echinodermata. Classes. Asteriodea(Stelleroids). Sea stars. Aka starfish. Echinodermata. Classes. Crinoidea/Crinoids. Feather stars. Sea lilies. Echinodermata. Classes. Echinoidea/Echinoids. Sea urchins, sand dollars. - PowerPoint PPT Presentation
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Phylum Echinodermata(Means spiny skin)
1EchinodermataClassesSea starsAsteriodea(Stelleroids)Aka starfish
2EchinodermataClassesCrinoidea/Crinoids
Feather stars
Sea lilies3EchinodermataClassesCompact body within a shellEchinoidea/EchinoidsSea urchins, sand dollars
No arms, often spiny4EchinodermataClassesElongated bodyHolothuroidea(Holothuriods)Sea cucumbers
Leathery body wall with embedded ossicles(bony plates)5OphiunoideaBrittle stars, Basket stars
(Add this to your hand out!)EchinodermataCommon Characteristicsas opposed to bilateralRadial SymmetryLike spokes on a wheel
7EchinodermataCommon CharacteristicsOr CylindricalBody may be roundWith 5 or more ambulacra (radiating areas)
Or star shaped
8EchinodermataCommon CharacteristicsCan regenerate lost partsEndoskeletonwith spines or spicules
9EchinodermataCommon CharacteristicsSimple Nervous systemNo head or brainNo excretory organsFew specialized sensory organs
Nerve ring / radial nerves
10EchinodermataCommon CharacteristicsWater Vascular SystemWater is taken in at the madreporite
Helps with respiration,Circulation and movement11
Specialized structuresMouth and anus ingestion and excretion of digestive wastesMadreporite sieve like structure through which water istaken in. Some species - gills
Tube feet for movementGonads - make gametes (sperm and eggs)13EchinodermataAnatomy
14EchinodermataReproductionOr gonochoric(two distinct sexes)May be hermaphrodites
Usually release sperm / egg into the water columnExternal fertilizationMany species synchronize this, along the lunar cycle
15EchinodermataNutritionThey have specialized mouthparts for thisMost sea urchins scrape algae off surfaces
Called Aristotles lantern
A few are scavengers or predators16EchinodermataNutritionSome are active filter feedersBrittle stars are mostly scavengers
Or just lay about waiting for food to float by and stick to them
They crawl about on the bottom looking for dead stuff
17EchinodermataNutritionThey tear open mollusks with their armsSea stars are carnivores
Then extrude their own stomach out of their mouths to release digestive juices into the clams body.18They eat mollusks like clams and mussels, some eat coral (Crown of thorns)
Answer to #6 on the hand out