Chapter 13 Part 3 Chapter 13 Part 3 of 3of 3

PhylumPhylumEchinodermatEchinodermat

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Phylum: Phylum: EchinodermataEchinodermata ““Spiny SkinnedSpiny Skinned” Animals” Animals

Sea Stars, Sea Urchins, Sea Cucumbers & Sea Stars, Sea Urchins, Sea Cucumbers & Sand Sand DollarsDollars

Phylum: EchinodermataPhylum: Echinodermata CharacteristicsCharacteristics

– Invertebrate- Aquatic – most are marineInvertebrate- Aquatic – most are marine– Pentaradial Symmetrical – Pentaradial Symmetrical –

usually in multiples of 5usually in multiples of 5

– Most with spiny hard Most with spiny hard endoendoskeletonskeleton– Internal Water Vascular System – Internal Water Vascular System –

control the tube feetcontrol the tube feet

– Sessile – they crawl on the bottomSessile – they crawl on the bottom– Ability to regenerateAbility to regenerate

ClassificationClassification Phylum Echinodermata is broken into Phylum Echinodermata is broken into

several classes 3 of which we will learn as several classes 3 of which we will learn as representative samples of the phylum:representative samples of the phylum:– Class Class AsteroideaAsteroidea – Starfish – Starfish– Class Class EchinoideaEchinoidea – Sea Urchins & Sand Dollars – Sea Urchins & Sand Dollars– Class Class HolothuroideaHolothuroidea – Sea Cucumbers – Sea Cucumbers

Starfish AnatomyStarfish Anatomy

Starfish AnatomyStarfish Anatomy

Water Vascular SystemWater Vascular System Hundreds of tube feet are individually controlled by the Water Vascular System.Hundreds of tube feet are individually controlled by the Water Vascular System. Need to know the flow of water into & through the system:Need to know the flow of water into & through the system: Madreporite Madreporite Stone canal Stone canal Ring Canal Ring Canal Radial Canal Radial Canal Lateral Canal Lateral Canal Ampullae Ampullae

Tube Feet Tube Feet

I think that’s it… I think that’s it… no more for now!!no more for now!!