biology lecture 14

biology lecture 14 - Arthropods I Skeletons, molting &...

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1 Arthropods I Skeletons, molting & muscles Oct. 19, 2010
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2 The picture below is the shell from an organism within the group… 1. Gastropoda 2. Cephalopoda 3. Bivalvia 4. Polyplacophora
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3 Which of the following statements about mollusks is true? a. Their mantle is a large, muscular structure. b. Their radula is a reproductive structure. c. Many have trochophore larvae. d. They lack a coelom.
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4 Which of the following mollusks groups have a closed circulatory system? 1. Snails 2. Nudibranchs 3. Clams 4. Chitons 5. Cuttlefish
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5 Lecture outline 1. Arthropods - characteristic features - exoskeleton and molting 2. Muscles - Neuromuscular junctions & action potential review - Muscle contractions - Muscle tissue types
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6 Protostome group: Ecdysozoans Nematodes - pseudocoelomates Arthropods - coelomates
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7 Recall: Arthropods are the most diverse eukaryotic group Arthropods, 965,000 , 62% Vertebrates , 57,600 , 4% Protozoa, 40,000 , 3% Fungi, 70,000 , 4% Molluscs, 70,000 , 5% Algae, 40,000 , 3% Plants, 270,000 , 17% Worms, 25,000 , 2% Beetles, 340,000 , 35% Crustacea ns, 40,000 , 4% Spiders, 75,000 , 8% Other Insects (e.g. flies, grasshoppers, damselflies) 510,000 , 53%
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8 Anomalocaris – Burgess Shale of BC | 505 Million years old Redpath Museum
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9 Anomalocaridids and the origin of arthropods Daley et al. 2009, Daley 2010
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10 The diversity of arthropods Dytiscus = predaceous diving beetle, adults collect air under wings & use this to breathe underwater Honey bee (Apis) has among most complex social life – e.g. worker bees dance to communicate location of new food source
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11 http://www.youtube.com/watch?v=-7ijI-g4jHg Angle of waggle relative to sun communicates position of food source Duration of waggle communicates distance of food source This work was awarded a Nobel prize … however, new data shows that up to 93% of the time other bees ignore the dance Early experiments were conducted with artificial feeders and few food sources Other cues such as odor are likely important
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12 But, something way cooler!! The Bombardier Beetle http://www.youtube.com/watch?v=j-wVFLucTks
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Arthropods “jointed foot” largest eukaryotic phylum • very abundant (10 18 individuals alive at any one time)
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This note was uploaded on 11/02/2011 for the course BIOL BIOL 111 taught by Professor Roffey during the Fall '09 term at McGill.

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biology lecture 14 - Arthropods I Skeletons, molting &...

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