BIO MONDAY FEB 8

BIO MONDAY FEB 8 - Porifera Cnidaria Platy- Annelida...

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Sheet1 Page 1 Porifera Cnidaria Platy- Annelida Mollusca Nematoda Arthropoda Echino- Chordata helminthes dermata Lophotrochozoa Ecdysozoa Protistan ancestor Eumetazoa Radiata Bilateria Protostomia Parazoa levels of cell & tissue organization fundamental symmetry and number of germ layers Development patterns Cuticle presence or absence Deuterostomia Last major lineage to consider: Deuterostomes Like all protostomes, deuterstomes are triploblastic many protostomes, they are eucoelomate. But they differ in the pattern of development: the anus secondarily the mouth secondarily Blastopore forms: From gut, by enterocoely Schizocoely (blocks of mesoderm split internally to form coelom) Origin of coelom Endodermal, from archenteron Ectodermal, from cells near blastopore Mesoderm formation Radial, indeterminate (cell fates established late in development) Spiral, determinate (cell fates established early in development) cleavage Protostomata Deuterostomata The deuterostomes: Echinoderms & Chordates The deuterostomes: Echinoderms & Chordates Deuterostome development: formation of mesoderm and coelom Blastopore forms anus, mouth forms secondarily, hence, Mesoderm begins to form from (archenteron outpocket hpinches offh to form coelom) houtpocketh deuterostomes (deutero = hsecondh, stome = hmouthh)
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Sheet1 Page 2 outpockets of the early gut: enterocoely (from endoderm) The deuterostomes: Echinoderms & Chordates Deuterostome development: formation of mesoderm and coelom Blastopore forms anus, mouth forms secondarily, hence, Mesoderm begins to form from outpockets of the early gut: enterocoely (from endoderm) ( Mesoderm eventually completely lines the coelom (eucoelomate) anus mouth Ectoderm Mesoderm Coelom (from gut: Enterocoely) Endoderm Gut lumen The deuterostomes: Echinoderms & Chordates Deuterostome development: formation of mesoderm and coelom Porifera Cnidaria Platy- Annelida Mollusca Nematoda Arthropoda Echino- Chordata helminthes dermata Deuterostomia Lophotrochozoa Ecdysozoa Protistan ancestor Eumetazoa Radiata Bilateria Protostomia Parazoa The deuterostomes: Echinoderms levels of cell & tissue organization fundamental symmetry and number of germ layers Development patterns About 7,000 species, all marine substrate dwellers (larvae planktonic). Adults sedentary or slow-moving. Unique features (besides deuterostomate development) are: goes through a bilaterally symmetric stage which develops asymmetrically. of CaCO3. Movable in some species (spines). deuterostomes (deutero = hsecondh, stome = hmouthh) h Pentaradial symmetry. After coelom formation, larva h Internal (dermal) skeleton (endoskeleton) made of ossicles h Internal water vascular system, derived from coelom.
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Sheet1 Page 3 Used in locomotion and other functions. Connects to podia (short 'tentacles' or arms, often with grasping ends) -- also called tube feet. phylum Echinodermata
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This note was uploaded on 05/04/2010 for the course BIO 5B taught by Professor Chappell during the Spring '07 term at UC Riverside.

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BIO MONDAY FEB 8 - Porifera Cnidaria Platy- Annelida...

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