Download - Phylum Echinodermata Deuterostomia –Anus forms from or near blastopore –Mouth forms secondarily
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Phylum Echinodermata
• Deuterostomia– Anus forms from or near
blastopore– Mouth forms secondarily
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Protostomes vs Deuterostomes
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Plutei
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Echinoderm Development
• Metamorphosis of bilaterally symmetric larvae to pentaradial adults
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Deuterostome Phylogeny
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Echinoderm Phylogeny
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Echinoderm Symmetry• Primary bilateral symmetry
– Larval forms– Some adult forms
• Secondary pentaradial symmetry– 5 radial divisions of major
organ systems
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Phylum Echinodermata
• Spiny skin• Endoskeleton
– Dermal ossicles– CaCO3, Ca2(PO3)2
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Pedicellaria
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Phylum Echinodermata
• Water vascular system
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Water Vascular System & Tube Feet
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Tube Feet
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Hemal Canals
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Class Asteroidea
• Central body disc• Most frequently 5 arms• Regeneration
Starfish & Sea Stars
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Asteroidea Anatomy
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Asteroidea Anatomy
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Regenerating Arms
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Commensals of Echinoderms
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Class Ophiuroidea
Brittle StarsSea baskets
Reduced central discReduced tube feet
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Class OphiuroideaSea baskets
Basket stars
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Ophiuroidea Anatomy
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Ophiuroidea Anatomy
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Class Echinoidea
Sand dollars
Sea urchins
Sea biscuits
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Echinoid Anatomy
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Echinoid Mouth – Aristotle’s Lantern
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Class HolothuroideaSea Cucumbers
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Holothuroidea Anatomy
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Holothuroidea Defense Reaction
• Eversion of the respiratory tree and lower intestine
• Some species produce toxins
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Class Crinoidea
Feather StarsSea Lillies
Sessile Crinoids
Swimming Crinoid
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Crinoid Anatomy