1. KINGDOM ANIMALIA

2. I. General Characteristics Multi-cellular Eukaryotes Consumers (Heterotrophs) Motile Complex organ system Reproduces sexually Two divisions:  Invertebrates & Vertebrates

3. Animals have Symmetry Symmetry  Balance in proportions of an object or organism Asymmetry  Irregular body plan Radial symmetry  Body can be divided along any plane, through the central axis, into roughly equal halves Bilateral symmetry  Body can be divided down its length into similar right and left halves that form mirror images of one another

4. Body Plans Coelom  Body cavity surrounded by a mesoderm  Acoelomate Three cell layers with a digestive tract but no body cavities  Pseudocoelomate Fluid-filled body cavity partly lined with mesoderm

5. INVERTEBRATES Animals without a backbone Porifera Cnidarians Platyhelminthes Nematoda Annelida Mollusca Arthropoda Echinodermata

6. Invertebrates

7. II. Phylum Porifera A. Example: sponges B. Word means “pore bearing” C. Asymmetry D. Natural sponges: nonliving material that remains after decay

8. E. Sessile: live attached to a surface F. Do not have nerve cells or tissue G. Filter feeders: pump water in and out and feed on the organic material in water H. Many are hermaphrodites: able to produce male and female gametes – an advantage for sessile organisms I. Can reassemble when fragmented

9. III. Phylum Cnidaria A. Examples: coral, jellyfish, sea anemone

10. B. Cnidocytes: cells that contain stinging poisonous barbs with which they paralyze prey C. Radial symmetry D. Two body forms 1. polyp: sessile, tentacles up – coral, hydra 2. medusa: free swimming, tentacles down – jellyfish

11. E. Digestive body cavity surrounded by two layers of cells F. Sexual or asexual reproduction – hydra reproduces by budding G. Coral reefs build up and are important ocean habitats

12. IV. Phylum Platyhelminthes A. Examples: flatworms, tapeworms, flukes

13. B. Many parasitic forms - cause many diseases of people and livestock C. Bilateral symmetry and cephalization (concentration of sensory organs and nervous tissue in the head) D. One digestive opening (pharynx) to take in food and release waste – most don’t need complex digestive systems because food has already been digested by their host E. Most are hermaphroditic, some can regenerate lost body parts

14. V. Phylum Nematoda A. Examples: roundworms (pinworms, hookworms)

15. B. Many are microscopic C. Two digestive openings: mouth and anus – food moves only one way D. Only sexual reproduction; usually separate sexes; no regeneration E. Most are free-living, many are parasitic – you can be infected by consuming contaminated food/water or by being bitten by insects

16. VII. Phylum Annelida A. Examples: segmented worms, earthworms, leeches

17. B. Body divided into many segments C. Complete digestive tract 1. pharynx 2. esophagus 3. crop 4. gizzard 5. intestine 6. anus

18. D. Closed circulatory system: blood stays within vessels 1. main vein is dorsal (upper/back side) 2. 5 aortic arches: function as simple hearts F. Earthworm is hermaphroditic; others have separate sexes G. Earthworms are important in the soil ecosystem– provide passageways for plant roots and water

19. VIII. Phylum Mollusca A. Examples: snails, clams, octopus, squid

20. B. Mollusks and annelids have a true coelom (body cavity) C. Characteristics: 1. muscular foot: used for motion or attachment – the foot may be modified into tentacles 2. mantle: soft, outer layer of body 3. visceral mass: contains most of the internal organs 4. gills or lungs: located in the mantle cavity

21. D. Main groups of mollusks 1. gastropods (“stomach-footed”) a. univalves: one shell, breathe with lungs; example: snail b.bivalves: two shells, breathe with gills; example: clam 2. cephalopods (“head-footed”) - foot is modified into tentacles, breathe with gills; examples: octopus, squid

22. E. Sexual reproduction: most have separate sexes, some are hermaphrodites F. Most have an open circulatory system (blood is contained within vessels that empty into sinus cavities). Cephalopods have a closed system (blood remains within vessels). G. Most mollusks are marine, but some live in fresh water or on land

23. IX. Phylum Arthropoda A. Largest phylum – found in almost all places on earth B. Characteristics: 1. exoskeleton a. Outside the body b. Very good protection c. Does not grow, so it must be shed periodically (molting)

24. 2. paired, jointed appendages (body extensions) 3. segmentation 4. open circulatory system 5. ventral (lower/belly side) nerve cord C. Classified based on number and structure of body segments and appendages

25. D. Centipedes and Millipedes 1. most primitive arthropods 2. obvious segmentation 3. Centipedes (Class Chilopoda) a. one pair of legs per segment b. poisonous fangs for killing prey c. long antennae

26. 4. Millipedes (Class Diplopoda) a. two pairs of legs per segment b. one pair of short antennae c. usually harmless vegetarians

27. E. Crustaceans (Class Crustacea) 1. examples: lobster, crayfish, shrimp

28. 2. most are marine 3. two body regions: a. cephalothorax b. abdomen (divided into 7 segments) 4. two short pair of antennae (1 long, 1 short pair) 5.swimmerets: appendages on the abdomen used for swimming

29. 6.breathe by gills attached to the swimmerets 7.one pair of large claws 8. 4 pairs of walking legs

30. F. Arachnids (Class Arachnida) 1. examples: spiders, ticks, mites, scorpions

31. 2. two body regions: a. cephalothorax b. abdomen: no appendages on abdomen 3. no antennae 4. simple eyes 5. 4 pairs of walking legs 6. mouthparts modified as fangs (chelicerae) to stab prey and suck out body fluids 7.book lungs (gills modified for breathing on land)

32. G. Insects (Class Insecta) 1. over 75% of all animal species 2. first animals to develop flight

33. 3. Characteristics: a. three body regions 1. head 2. thorax (with 3 pairs of legs) 3. abdomen b. usually 1 or 2 pairs of wings c. 1 pair of antennae d. compound eyes e. respiration through a system of tubes called tracheae

34. 4. metamorphosis: a series of changes during which young insects develop into adults a. some insects do not carry on metamorphosis (silverfish)

35. b. incomplete (gradual) metamorphosis (grasshopper) 1. egg 2. nymph (look like adults, but smaller, with no wings or reproductive organs) 3. adult

36. c. complete metamorphosis (butterflies, bees) 1. egg 2. larva (caterpillar) 3. pupa 4. adult

37. X. Phylum Echinodermata A. Name means “spiny skin” B. Marine environment C. Radial symmetry – body parts usually in multiples of 5 1. larvae have bilateral symmetry 2. have a fairly close relationship to vertebrates

38. D. Water vascular system 1. system of internal tubes 2. carries out functions of circulation, respiration, and movement E. Tube feet 1. act like living suction cups 2. help in movement and feeding

39. F. Examples: sea urchins, sand dollars, starfish

40. XI. Comparing Invertebrates A. Specialized cells, tissues, and organs 1. Sponges and Cnidarians: little internal specialization 2. Flatworms: simple organs 3. More complex invertebrates: organ systems

41. B. Body symmetry 1. sponges: no symmetry 2. cnidarians and echinoderms: radial symmetry 3. all other phyla: bilateral symmetry

42. C. Cephalization: concentration of sense organs and nerve cells in the front of the organism 1. sponges: no nerve tissue 2. cnidarians: nerve net 3. worms and arthropods: groups of nerves called ganglia 4. mollusks: brain

43. D. Coelom formation: body cavity formation 1. sponges and cnidarians: two cell layers with a jellylike material between them 2. other invertebrates have 3 cell layers

44. 3. types of coeloms: a. flatworms: no body cavity (acoelomates) b. roundworms: body cavity partially lined with mesoderm (pseudocoelomates) c. other invertebrates: body cavity completely lined with mesoderm (coelomates)

46. F. Feeding and digestion 1. intracellular digestion: food is broken down inside cells (lower animals) 2. extracellular digestion: food is digested and then enters the cells – enables digestion of larger pieces of food (higher invertebrates)

47. G. Respiration 1. diffusion through skin: many worms 2. gills: aquatic invertebrates (many mollusks and arthropods) 3. mantle cavity: snails 4. book lungs: spiders 5. tracheal tubes: many insects

48. H. Circulation 1. open circulatory system: blood does not stay within vessels, empties into sinuses; examples: arthropods, most mollusks 2. closed circulatory system: blood remains within vessels; examples: annelids, some mollusks

49. I. Movement and support 1. hydrostatic skeleton: fluid-filled body cavity supports the muscles; examples: annelids, jellyfish 2. exoskeleton: skeleton is outside the body; examples: arthropods 3. endoskeleton: located inside the body; examples: vertebrates

50. J. Reproduction 1. all animals reproduce sexually, some may also reproduce asexually 2. external fertilization: (usually in water) eggs and sperm are released into the surrounding environment 3. internal fertilization: (usually on land) eggs are fertilized inside the body of the female