BIO 201 F09 True lect 15 (L15) v3

BIO 201 F09 True lect 15 (L15) v3 - PLEASE TURN CELL PHONES...

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PLEASE TURN CELL PHONES OFF NOW
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Today’s factoid Fusitriton oregonensis (the state shell of Oregon) holds the record for the longest larval development period of any marine invertebrate Larvae can delay metamorphosis for 4 years until they find a suitable site Species found on US and Japanese sides of Pacific May provide enough time for larvae to cross the Pacific Ocean Strathmann & Strathmann 2007 The Biological Bulletin 213: 152-159 http://www.biolbull.org/cgi/content/full/213 /2/152 Adult Fusitriton oregonensis 1-year old larval F. oregonensis
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LOPHOTROCHOZOAN
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LOPHO – TROCHO - ZOAN
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Ectoprocts, Brachiopods, and Phoronids have a lophophore feeding apparatus lophophore
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Ectoprocts, Brachiopods, and Phoronids have a lophophore feeding apparatus Ectoproct; Phidolopora sp. lophophore (from far away)
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Some Molluscs, Annelids, and Ribbon Worms have a swimming (planktonic) trochophore larvae sweet hair bands of cilia mouth ~100 μ m
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lophophore feeding lophophore feeding lophophore feeding trochophore larvae trochophore larvae trochophore larvae ? ? There is no synapomorphy for the lophotrochozoans
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Grouped by molecular evidence But remember: a phylogeny is a hypothesis Grouped by molecular evidence
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Today, we will cover the three most speciose phyla of the Lophotrochozoans: - Platyhelminthes (Flatworms) - Annelids - Molluscs
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PHYLUM PLATYHELMINTHES (Flatworms) - >20,000 species - Free-living or endo-parasites - Many microscopic, some >1m - Marine and freshwater - No lophophore; no trochophore larvae - Acoelomate = no body cavity - Triploblastic = 3 germ layers (mesoderm) - Dorsoventrally flattened - Incomplete digestive tract (wastes exit through mouth) - Ladder-like nervous system - No circulatory system - Asexual (fission); sexual (hermaphrodites) reproduction
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PHYLUM PLATYHELMINTHES (Flatworms) - >20,000 species - Free-living or endo-parasites - Many microscopic, some >1m - Marine and freshwater - No lophophore; no trochophore larvae - Acoelomate = no body cavity - Triploblastic = 3 germ layers (mesoderm) - Dorsoventrally flattened - Incomplete digestive tract (wastes exit through mouth) - Ladder-like nervous system - No circulatory system - Asexual (fission); sexual (hermaphrodites) reproduction
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PHYLUM PLATYHELMINTHES (Flatworms) Ocelli (eye spots) < 1 cm length
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This note was uploaded on 12/22/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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BIO 201 F09 True lect 15 (L15) v3 - PLEASE TURN CELL PHONES...

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