Lecture 18

Lecture 18 PowerPoint PPT Presentation

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Learning Objectives (p. 1 of 2). DefineChitinClass AvesClass Mammalia. Learning Objectives (p. 2 of 2). ContrastExtant vs. extinctIdentify an arthropodDistinguish arthropods from non-arthropodsDistinguish insect vs. non-insect arthropods. Caution. Today's lecture is partly a training sessionDo not copy

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Lecture 18

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1. Lecture 18 Biology 1112 Chapter 33: Invertebrates Chapter 34: Vertebrates

2. Learning Objectives (p. 1 of 2) Define Chitin Class Aves Class Mammalia

3. Learning Objectives (p. 2 of 2) Contrast Extant vs. extinct Identify an arthropod Distinguish arthropods from non-arthropods Distinguish insect vs. non-insect arthropods

4. Caution Today’s lecture is partly a training session Do not copy “Ex:” (Example) slides! WATCH them instead!

5. Arthropods Phylum Arthropoda All have: Jointed appendages An exoskeleton Made of chitin (polysaccharide w/proteins)

6. Ex: Horseshoe Crabs are Arthropods Very, very ancient! Have some medical applications

7. Ex: Arachnids are Arthropods Include spiders, scorpions, ticks, dust mites Dust mites do not carry disease, but many people allergic to them! Without spiders, fly population would be largely unchecked

8. Ex: Crustaceans Lobsters, crayfish, crabs, shrimps, barnacles Interesting notes on barnacles They use jointed appendages to gather food particles Like other crustaceans, they can be eaten!

9. Ex: Barnacles as Food Barnacles are over-looked Perhaps need better marketing Slogan 1: Barnacles: they’re what’s for dinner. Slogan 2: Barnacles do a body good. Slogan 3: Barnacles, the other white meat.

10. Assessment Put away your books, notes Take out a pencil or pen!

11. Answers

12. Insects Easily the most diverse of the arthropods! 1 million species currently known—plenty left to be discovered There are more insect species than ALL other species combined!

13. Shared Insect Characteristics Most have 3 body parts Head Thorax Abdomen Often have antennae Many have specialized mouth parts Ex: mosquitos have mouth for piercing skin, sucking blood

14. Insects Aren’t All Bad! Beauty: butterflies, dragonflies, fireflies Pollination: moths, bees (plus, they make honey) Farmers rent bees! Food for trout, bream: many aquatic larvae are favorites! Fly anglers know this!

15. Ex: Orthoptera and Hemiptera are Insects Order Orthoptera The grasshoppers and friends Hemiptera The “true bugs”

16. Ex: Odonata are Insects The dragonflies and damselflies 2 similar pairs of wings Larvae can be quite large Can eat small fish & tadpoles!

17. Ex: Coleoptera are Insects The Beetles! The most popular (by number of species) order in the animal kingdom! Live in wide range of habitats: forests, ponds, streams, soil, dung, carrion, plants Wide range of sizes: 1mm to 12 cm 2 pairs of wings (dissimilar) Forewings form hard covering Hindwings used for flight

18. Ex: Lepidotperans are Insects The butterflies and moths Long, tube-like mouth parts for nectar-eating

19. Ex: Hymenoptera are Insects Ants, bees, wasps 2 pairs of wings Thorax and abdomen separated by very thin waist

20. Ex: Dipterans are Insects All have Single pair of wings A pair of halteres Like little gyroscopes Used for balance in flight

21. Questions: Is this an animal? Yes Is this an arthropod? Yes If so, is it an insect? No

22. Questions: Is this an arthropod? No, it’s a mollusk What kind? Cephalopod

23. Questions: Are arthropods all insects? No Are all insects arthropods? Yes

24. Seventh Inning Stretch

25. Phylum Echinodermata The sea stars, sea urchins Radial symmetry Lack segmentation

26. Phylum Chordata The “chordates” All share in common: Dorsal hollow nerve cord Notochord The flexible rod between the digestive tract and nerve cord Post anal tail Gill structures

27. Major Chordate Groups Tunicates Lancelets Vertebrates

28. Tunicates The sac-like chordates Adult is sessile (bottom-dwelling) Juvenile larvae are free-swimming Look sort of like a tadpole

29. Lancelets Also chordates Bear uncanny resemblance to tunicate larvae! Probably evolved from tunicate-like ancestor

30. Vertebrates Also chordates In addition to other chordate traits, they also have: Skull Backbone Most also have hinged jaws Evolved from gill-support structures

31. Fishes Cartilagenous fishes Skeleton soft, flexible Sharks, rays Bony fishes Ray-finned Lobe-finned

32. Fishes Bony fishes Ray-finned Lobe-finned

33. Lobe-finned Fishes Coelacanth: the “living fossil” Fish Out of Time website Nova website

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