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Phylum Echinodermata Deuterostomia Anus forms from or near blastopore
Mouth forms secondarily Fig. 22.CO
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Protostomes vs Deuterostomes
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Plutei Fig. 22.9
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Echinoderm Development
Metamorphosis of bilaterally symmetric larvae to pentaradial adults Fig. 22.8
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Deuterostome Phylogeny
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Fig 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 Fig. 22.2a
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Phylum Echinodermata Spiny skin Endoskeleton Dermal ossicles
CaCO3, Ca2(PO3)2
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Pedicellaria Fig. 22.4
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Phylum Echinodermata Water vascular system
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Water Vascular System & Tube Feet
Fig. 22.2b
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Tube Feet
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Hemal Canals Fig. 22.6
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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 Fig. 22.7
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Commensals of Echinoderms
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Class Ophiuroidea Sea baskets Brittle Stars Reduced central disc
Reduced tube feet Fig b
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Class Ophiuroidea Sea baskets Fig b Basket stars
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Ophiuroidea Anatomy Fig
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Ophiuroidea Anatomy Fig
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Class Echinoidea Sea urchins Fig Sea biscuits Sand dollars
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Echinoid Anatomy Fig
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Echinoid Mouth – Aristotle’s Lantern
Fig
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Class Holothuroidea Sea Cucumbers
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Holothuroidea Anatomy
Fig. 22.Fig. 22a
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Holothuroidea Defense Reaction
Eversion of the respiratory tree and lower intestine Some species produce toxins Fig c
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Class Crinoidea Feather Stars Sea Lillies Sessile Crinoids
Fig Feather Stars Sea Lillies Sessile Crinoids Swimming Crinoid
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Crinoid Anatomy Fig
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