Nematoda. Round worms Feeding and Parasitism

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1 Nematoda Round worms Feeding and Parasitism

2 Nematoda Have pseudocoelom Live in many environments Parasitic Important decomposers Covered with cuticle Trichinella spiralis see fig 18.8B

3 Nematode Diets and Mouths microbivore plant parasites predators

4 Trichinella spiralis Figure 18.8 Juvenile worms live in undercooked pork You eat them - the develop into adults in your intestines They find their way into your heart muscle and other muscle causing damage Cook your meat!

5 Phylum Mollusca Soft bodied animals with shells And diverse body forms

6 Phylum Mollusca Name means soft-shelled nut Snail, clams, oysters, octopuses and squids Feeding habits: Scrapers and suspension feeders (rarely, carnivores)

7 Important Mollusk Features muscular foot - posterior, ventral, locomotory mantle -dorsal epidermis that makes the shell also encloses the body in a mantle cavity ciliated mantle cavity helps with respiration and sometimes feeding radula -tongue-like scraper used for feeding Campbell 18.9

8 Mollusk Body Designs Campbell Fig. s 18.9B-F

9 Mollusk diversity chitons

10 Mollusk diversity Squid Sea slug Nautilus

11 Giant Squid! Artituthus can be 30 ft+

12 Complex Squid Behavior shell reduced to pen mood and camouflage colors ink for concealment

13 Segmentation Most animals have segmented bodies Subdivision of body into repeated parts Nervous, circulatory,excretory organs Provides flexibility, and mobility

14 Phylum Annelida Segmented Worms

15 Types of annelids Earthworms -Terrestrial soil worms Polychaetes -Marine sand wormshave appendages Leeches-fresh water -parasitic! Hirudo medicinalis

16 Earthworms Soil annelids Process soil by digesting the organic matter there Improve its texture See the segments Campbell 18.10

17 Polychaetes segment or repeating body unit has appendages and bristles

18 Polychaete Diversity surface depositfeeder lug worm paper tube worm (deposit-feeder)(filter-feeder) sand worm (carnivore)

19 Leech Anatomy

20 Leech Diversity

21 Arthropoda The Most Successful Phylum

22 Diversity of Arthropoda > 2,000,000 species (estimated) our worst pests and valuable helpers

23 Arthropod Characteristics jointed appendages Walking, feeding, reproduction chitinous cuticle thickened to exoskeleton Molting Shed old skin to allow body growth SEGMENTS ARE FUSED!

24 Cuticle mainly chitin tough, flexible, covering stiffened with calcium carbonate in some arthropods permeable but resists chemicals waterproofed with waxes in insects protection, support, muscle attachment

25 Campbell fig 18.12A

26 Arthropod Groups Horseshoe crabs Arachnids Crustaceans Centipedes and millipedes Insects

27 Arachnids Arthropoda diversity compare Campbell Fig B-E Millipede Crustacea Horseshoe crab

28 Common Features of insects 18.13A Three part body Head - antenna, eyes, mouthparts Thorax-legs and wings Abdomen

29 Incomplete Metamorphosis Young resemble adults with different body proportions Wingpads visible in larvae mayfly damselfly wing pads wing pads

30 Complete Metamorphosis larval stages specialized for eating and look different from the adult forms beetle egg larvae pupa adult eggs ant adult adult larva pupa adult

31 Insect Diversity Dragon and damselflies Moths Waterstriders Mosquitos Bees, wasps Beetles

32 Echinodermata Spiny-skinned Sea Animals

33 Apparent Radial Symmetry Fig A like spokes of a wheel sea star

34 Echinoderm Habitat entirely marine larvae are planktonic and Bilateral adults are entirely benthic but most adults can crawl, and tend back toward bilateral symmetry

35 Water Vascular System unique to echinoderms used for locomotion and foodgathering Components: Water filled canals tube feet

36 Tube Feet of Sea Star equipped with: internal ampulla, valves, and many tiny muscles connector to a radial canal

37 Starfish Anatomy Campbell Fig A pyloric stomach cardiac stomach bony internal skeleton elements of water vascular system

38 Reproduction mostly sexual but sea stars can regenerate severed arms some kinds can break apart and re-grow into two sea star, regenerating arms

39 Sea Stars or Starfish Campbell Fig A

40 Sea urchins and Sand dollars compare Campbell Fig C sea urchin sand dollar some have poisonous spines

41 Brittle or Serpent Stars Scavengers and passive suspension-feeders

42 Feather Stars or Sea Lilies passive filter-feeders

43 Sea Cucumbers tentacles tube feet deposit-feeder suspension-feeder

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