Ch33 Lecture-Spr11

Ch33 Lecture-Spr11 - 33 Deuterostome Animals 33.1 What is a...

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Deuterostome Animals 33
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33.1 What is a Deuterostome? Deuterostomes characterized by three early developmental patterns: Radial cleavage Mouth forms opposite blastopore – blastopore forms anus Coelom develops from mesodermal pockets that bud off from gastrula’s cavity http://kentsimmons.uwinnipeg.ca/16cm05/1116/32-07-ProtoDeuterostDev-L.gif
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33.1 What is a Deuterostome? Radial cleavage and bilateral symmetry are ancestral states for all bilaterian animals Evidence from DNA sequencing supports monophyly of deuterostomes Fewer species of deuterostomes than protostomes
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33.1 What Is a Deuterostome? Living deuterostomes comprise three clades: Echinoderms — sea stars, sea urchins, and their relatives Hemichordates — acorn worms and pterobranchs Chordates — sea squirts, lancelets, and vertebrates
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Figure 31.1 The Phylogeny of Animals
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Figure 33.1 Phylogeny of the Deuterostomes
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33.1 What is a Deuterostome? Deuterostomes are triploblastic ,… coelomate animals… with internal skeletons www.sci.nu.ac.th/biology/elearning/picture5 http://images.encarta.msn.com/xrefmedi a/aencmed/targets/illus/ilt/T014598A.gif
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33.1 What is a Deuterostome? Bilateral symmetry is ancestral condition Echinoderms evolved unique pentaradial symmetry other deuterostomes retained bilateral symmetry
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Deuterostomes, Echinoderms and Hemichordates Together echinoderms and hemichordates are known as ambulacrarians Only six of 23 groups of echinoderms known from fossils survive today – nearly all are marine – ~7000 species Hemichordates – 100 living species
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Deuterostomes, Echinoderms and Hemichordates Both echinoderm and hemichordates Ciliated larvae have bilateral symmetry in echinoderms, larvae develop into adults changes to pentaradial symmetry (in fives or multiples of fives) Hemichordate adults retain bilateral symm. http://www.snv.jussieu.fr/bmedia/oursinMDC/coursours3/ Paracentrotus urchin: pentaradial adult and test, and bilateral echinopluteus larva www.smiley.cy.net/basspro
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Deuterostomes, Echinoderms Echinoderm derived characters (synapomorphies) lack head, and move equally well in many directions have oral side containing mouth, and aboral side containing anus http://www.tolweb.org/tree/ToLimages/diagram5a1.gif http://www.oceanexplorer.noaa.gov/explorations/islands01/log/aug30/media/brittlestar_450.jpg Ophioderma brittlestar
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Deuterostomes, Echinoderms
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Deuterostomes, Echinoderms Echinoderms have endoskeleton system of internal calcified plates covered by thin layers of skin and some muscle plates fuse to form internal skeleton Neognathostomata www.nhm.ac.uk/research-curation/departments/palaeontology/echinoids/GENERA/CASSIDULOID/72gif Fossilized, early “sea biscuits”
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Deuterostomes, Echinoderms Water vascular system Network of water-filled canals leading to tube feet Water enters through madreporite , Connected to ring canal around esophagus Other canals radiate out from ring canal
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This note was uploaded on 06/06/2011 for the course BSC 2011 taught by Professor Presley during the Spring '11 term at FAU.

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Ch33 Lecture-Spr11 - 33 Deuterostome Animals 33.1 What is a...

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