Wiens-lecture10-16April_v2 - Copy

Wiens-lecture10-16April_v2 - Copy - Todays Lecture Revisit...

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Today’s Lecture • Revisit the deuterostomes • Learn about echinoderms and hemichordates • Cambrian explosion
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Test next Wednesday (April 21) • Same format and rules as previous exams • Read the book and go over the lectures, but test will be primarily on the lectures
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Studying advice • Big studying night should be the night before the night before the exam, but start before then also (e.g., Sunday) • Don’t stay up all night the night before the exam • Write down and then rewrite all the material in the lectures 5-6 times; don’t expect to memorize the material just by reading it • Make flashcards to learn vocabulary; start this week, not next week • Study alone, in a quiet place with no music or TV (try the library)
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Today’s Factoid • Last lecture we learned about loriciferans • Italian scientists recently discovered loriciferans off the coast of Greece that live in an environment without oxygen (hypersaline basins, 3,250 m below the surface) • Have specialized mitochondria for no-oxygen environment • First animals discovered that live without oxygen
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Phylogeny of animals last Friday Monday Wednesday Today Next week
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Two major clades within Bilateria • Protostomia : includes insects, crustaceans, earthworms, flatworms, mollusks • Deuterostomia : includes echinoderms (sea stars) and chordates (vertebrates and relatives, including fish, amphibians, reptiles, birds, and mammals)
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Two major clades within Bilateria Three important differences in development between protostomes and deuterostomes First difference: • In protostomes, blastopore becomes mouth, anus forms later • In deuterostomes, blastopore becomes anus, mouth forms later
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Two major clades within Bilateria A second important difference in development between protostomes and deuterostomes, but much less consistent and clear • Egg cell divides in even pattern (radial cleavage); in deuterostomes, some protostomes • Egg cell divides in uneven pattern (spiral cleavage) in some protostomes including many lophotrochozoans
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Two major clades within Bilateria A third important difference in development between protostomes and deuterostomes, involves the
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This note was uploaded on 12/05/2010 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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Wiens-lecture10-16April_v2 - Copy - Todays Lecture Revisit...

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