Transcript Chapter 23
Chapter 23 Animals: The Invertebrates Characteristics of Animals 1. 2. 3. Multicellular. Cells are usually arranged in organs or organ systems Heterotrophs Require oxygen to perform aerobic respiration 4. 5. 6. Most are motile at some point in the life cycle Life cycle includes some sort of embryonic development Mostly reproduce sexually (some asexually) Radial Symmetry No clear front or rear Body parts are arranged around a central axis Bilateral Symmetry Organism is the same on either side of one plane of symmetry Has a true front and rear Phylum Porifera - Sponges Animals with no symmetry, no tissues or organs. Range in size from tiny (like a fingernail) to large enough to sit in Engulf particles to feed (phagocytosis) Can reproduce sexually with a larva or asexually by fragmentation Sponges Phylum Cnidaria Jellyfish, sea anemones, coral All are aquatic – most are ocean dwelling Have tissues Have nematocysts – “stinging darts” Reproduce sexually Have a nerve net for stimulation Jellyfish, Corals, Hydra Phylum Platyhelminthes Flatworms Turbellarians, Flukes, and Tapeworms Have a simple digestive system – absorb food from a host Body is flattened Most are hermaphrodites, but will reproduce sexually with another flatworm Flatworms Sea slugs Phylum Nematoda - Roundworms Thrive nearly everywhere Have a complete digestive system Have a partial body cavity where reproductive organs are found Most are free-living, with few parasitic species Roundworms Ancyclostoma duodenale (hookworm) Phylum Annelida – Segmented Worms Segmented worms – segments are repeating body sections Many have setae (small hair like bristles) to help them move through soil Have a complete gut, rudimentary brain (with nerve cord), and circulatory system Earthworms and Leeches Phylum Mollusca Octopus, squid, clams, scallops, snails, slugs, oysters Most have a hard shell with a soft body Have well developed organ systems Have a brain Octopus, Squid, Snail, Oyster Phylum Arthropoda (I accidently left this off – add it!) Insects, crustaceans, arachnids Hardened exoskeletons Jointed appendages Respiratory Structures Sensory Structures Division of labor Class Arachnida Class Insecta Class Crustacea Phylum Echinodermata Sea urchins, star fish Have spines or plates of calcium carbonate Well developed skeleton No brain, but nervous system is present Water vascular system to deliver water to tube feet for movement Sea Stars, Sea Urchins Class Asteroidea Phylum Chordata Includes some invertebrates and ALL vertebrates Subphylum Vertebrata – all vertebrates are in this subphylum Works Cited http://www.okc.cc.ok.us/biologylabs/Documents/Animals/Symmetry.htm http://trc.ucdavis.edu/biosci10v/bis10v/week9/sponge.gif http://www.okc.cc.ok.us/biologylabs/Images/Animal_Images/Sponge_copy.JPG http://www.aloha.com/~lifeguards/jellie75.jpg http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20102/Bio%20102%20lectures/animal%20div ersity/lower%20invertebrates/hydra_l.s._X_40.jpg http://www.seaslugforum.net/images/flatworm.jpg http://waynesword.palomar.edu/images/taworm4b.jpg http://images.google.com/imgres?imgurl=http://biology.nebrwesleyan.edu/Courses/Labs/Biology_of_Animals/Zoo Lab10/Ancylostoma_male_10X.jpg&imgrefurl http://www.biology.iastate.edu/Courses/201L/Annelida/42%20whole%20worm.JPG http://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Leech_blutegel.jpg/300px-Leech_blutegel.jpg http://www.sheppardsoftware.com/images/animalpics/mollusk1.jpg http://webpages.charter.net/teefile/biognomen/photo/Mollusca.jpeg http://www.bioquip.com/prod_images/5389L-001-Class%20Insecta%20front.jpg http://www.troutnut.com/im_regspec/picture_1170_small.jpg http://www.insectzoo.msstate.edu/Images/7812793b.jpg http://webpages.charter.net/teefile/biognomen/photo/scorpion.jpeg http://www.emporia.edu/biosci/invert/lab6/limulusad.jpg http://www.earthlife.net/inverts/images/echinoderms/arbacia.jpg http://www.museums.org.za/bio/images/mb/mb0556m.jpg http://3.bp.blogspot.com/_3tLvZgf7WyA/SkqCO0e_L1I/AAAAAAAAAgo/8fUbEjGyTuU/s400/roach8.jpg