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PoriferaPorifera PlatyhelmithesPlatyhelmithes MolluscaMollusca ArthropodaArthropoda
HemichordataHemichordataCnidariaCnidaria NemerteaNemertea AnnelidaAnnelida
EchinodermataEchinodermataChordataChordataLophophoresLophophores
ProtozoansProtozoans
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Characteristics• Radial symmetry• Spiny skin• No head or brain• Water vascular system
– For locomotion, respiration, excretion, and food gathering.
– Opens to outside through pores in Madreporite.
• Deuterostome• All marine
Water-Vascular System of a Sea Star
Copyright © The McGraw-Hill Companies, Inc. Permissi on required for reproduction or display .
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Star Fish
• 5 or more tapering arms
• Mouth on underside
• Tube feet• Feed on molluscs and
sea urchins
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Pedicellaria-tiny jaws that keep surface clean
Pedicellaria-tiny jaws that keep surface clean
SpineSpineSpine
PedicellariaPedicellariaPedicellaria
Dermalbranchia
DermalDermalbranchiabranchia
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Brittle Stars and Basket Stars
• Largest group
• Central disc with distinct arms
• No pedicellariae• Tube feet lack
suckers
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Sand dollarSand dollar
MadreporiteMadreporiteMadreporite
Ambulacral regionAmbulacral regionAmbulacral region
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Feather Stars and Sea Lilies
• Most primitive
• Feather like arms used for suspension feeding
• Tube feet trap plankton
• Cilia in ambulacral grooves carry food to mouth
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Copyright © The McGraw-Hill Companies, Inc. Permissi on required for reproduction or display.
Class Crinoidea: Sea LilyAttach to substrate with stalk
Class Crinoidea: Feather StarSwim and crawl