1 phylum echinodermata bio 2215 oklahoma city community college dennis anderson
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Phylum Echinodermata
BIO 2215
Oklahoma City Community College
Dennis Anderson
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Phylum Echinodermata
• Radial symmetry• No head or brain• Spiny skin• Water vascular
system• No excretory organs• Deuterostome• Bilateral lavrae
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PoriferaPorifera PlatyhelmithesPlatyhelmithes MolluscaMollusca ArthropodaArthropoda
HemichordataHemichordataCnidariaCnidaria NemerteaNemertea AnnelidaAnnelida
EchinodermataEchinodermataChordataChordataLophophoresLophophores
ProtozoansProtozoans
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Class AsteroideaStar Fish
• 5 or more tapering arms
• Mouth on underside• Endoskeleton
– Ossicles
• Tube feet• Feed on molluscs and
sea urchins
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Aboral SurfaceAboral Surface
Madreporite
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PedicellariaPedicellaria
SpineSpineSpineSpine
PedicellariaPedicellariaPedicellariaPedicellaria
DermalDermalbranchiabranchia
DermalDermalbranchiabranchia
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Class AsteroideaClass Asteroidea
Aboral surfaceAboral surface Oral surfaceOral surface
Tube feet andTube feet andambulacral ambulacral groovegroove
Tube feet andTube feet andambulacral ambulacral groovegroove
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Water vascular systemWater vascular system
MadreporiteMadreporiteMadreporiteMadreporite
Ring canalRing canalRing canalRing canal
Stone canalStone canalStone canalStone canal
Radial canalRadial canalRadial canalRadial canal
Lateral canalLateral canalLateral canalLateral canal
Tube feetTube feetTube feetTube feetPolianPolianvesiclesvesicles
PolianPolianvesiclesvesicles
Tiedemann’sTiedemann’sbodiesbodies
Tiedemann’sTiedemann’sbodiesbodies
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Tube feetTube feet
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Tube footTube foot
Lateral canalLateral canalLateral canalLateral canal
AmpullaAmpullaAmpullaAmpulla
Body wallBody wallBody wallBody wall
Tube footTube footTube footTube foot
Retractor Retractor musclesmusclesRetractor Retractor musclesmuscles
SuckerSuckerSuckerSucker
Podial musclePodial musclePodial musclePodial muscle
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Movement of tube feetMovement of tube feet
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Water-Vascular System of a Sea Star
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Body Wall and Internal Anatomy of a Sea Star
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Feeding
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Class OphiuroideaBrittle Stars and Basket Stars
• Central disc with distinct arms
• No pedicellariae• Tube feet lack
suckers and ampulla
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Brittle starBrittle star
Bursal slitBursal slitBursal slitBursal slit
MouthMouthMouthMouth
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Basket Star
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Class EchinoideaSea Urchins
• Shell (test) encloses body– Ossicles form plates
• No arms• Long spines
– Movement– Venom
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Internal Anatomy of a Sea Urchin
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Class EchinoideaSand Dollar
• Burrow in sand
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Sand dollarSand dollar
MadreporiteMadreporiteMadreporiteMadreporite
GonoporeGonoporeGonoporeGonopore
Ambulacral regionAmbulacral regionAmbulacral regionAmbulacral region
LunuleLunuleLunuleLunule
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Class HolothuroideaSea Cucumbers
• Soft body with reduced ossicles
• Tentacles near mouth• Respiratory tree
– Breaths through anus
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Class Cridoidea Feather Stars and Sea Lilies
• Most primitive• Feather like arms
used for suspension feeding– Plankton
• Tube feet trap planktonic organism
• Cilia in ambulacral grooves carry food to mouth
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Class Crinoidea: Sea LilyAttach to substrate with stalk
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Class Crinoidea: Feather StarSwim and crawl
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Central diskCentral disk
AnusAnusAnusAnus
MouthMouthMouthMouth
PinnulePinnulePinnulePinnule
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Ancestral EchinodermsAncestral Echinoderms
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Ancestral EchinodermsAncestral Echinoderms
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The End