15-ch18-animals1

15-ch18-animals1 - Animal Diversity (loosely based on...

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Animal Diversity (loosely based on Chapter 18)
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What is an animal? Animals are multicellular, heterotrophic eukaryotes that obtain nutrients by ingestion . Life cycle: 1) Males and Female adults make haploid gametes by meiosis. 2) An egg and sperm fuse producing a diploid zygote. 3) The zygote divides by mitosis forming an early embryonic stage called blastula (hollow ball of cells). 4) In most animals one side of the blastula folds inward forming a stage called a gastrula . The internal sac forms the digestive tract. 5) Some animals develop directly into an adult, others have a larval stage.
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Invertebrates account for 95% of animal diversity (currently known species) backbones are rare! 1 phylum (out of 35)
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tentacles for grasping beak to inject toxin shell reduced, internal, or absent only mollusks with closed circulatory system Not your ordinary mollusk! Cephalopods are active predators aposematism = warning colors tetrodotoxin http://www.usatoday.com/tech/science/2006-12-22-squid_x.htm http://www.pbs.org/wgbh/nova/preview/i_3404.html change color with chromatophores extinct ammonites nautilus cuttlefish giant squid giant squid They call me the brainiest invertebrate! blue-ringed octopus The Cretaceous Extinction took more than just dinosaurs.
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(extinct) (extinct) Arthropods are named for their “jointed appendages” complete metamorphosis distinctly different larval stage (eating machine) incomplete metamorphosis juvenile “nymphs” similar to adults (but no wings)
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clawlike pinscers or fangs the “camel spider” - fact or fiction? move at speeds over 30 MPH
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15-ch18-animals1 - Animal Diversity (loosely based on...

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