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Lecture_11_24_2_Echinodermata

Lecture_11_24_2_Echinodermata - Remember the Deuterostomes...

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Remember the Deuterostomes : Features: Phylogeny: three groups, two are major (Echinoderms, Chordates) one is relatively minor (Hemichordates)
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Echinoderms are just weird! No head Radial symmetry
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Echinoderms: A bizarre reversal Consider the metazoan tree….
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Three key Echinoderm features: Skeleton: calcified internal plates, epidermal covering Water vascular system: locomotion, feeding Pentaradial symmetry (adult), bilateral in larvae Adult sea star Larval sea star
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Water vascular system Central ring Side arm Ampulla Ampulla Suction cup 1-way valves
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Echinoderm diversity Crinoidea: Sea lilies & feather stars Asteroidea: Sea stars Ophiuroidea: Brittle stars, basket stars Echinoidea: Sea urchins Holothuroidea: Sea cucumbers
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Water vascular system Crinoids Sea cucumbers Sea urchins Brittle stars Sea stars Reduced skeleton Fused skeleton Loss of suckers Suckers
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Crinoidea: Sea lilies & feather stars -625 species, major diversity 300-500 million years ago -some can swim actively as adults (attached as juveniles)
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