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
1. Lecture 18 Biology 1112
Chapter 33: Invertebrates
Chapter 34: Vertebrates
2. Learning Objectives (p. 1 of 2) Define
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
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!
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
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
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?
Is this an arthropod?
If so, is it an insect?
22. Questions: Is this an arthropod?
No, it’s a mollusk
23. Questions: Are arthropods all insects?
Are all insects arthropods?
24. Seventh Inning Stretch
25. Phylum Echinodermata The sea stars, sea urchins
26. Phylum Chordata The “chordates”
All share in common:
Dorsal hollow nerve cord
The flexible rod between the digestive tract and nerve cord
Post anal tail
27. Major Chordate Groups Tunicates
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:
Most also have hinged jaws
Evolved from gill-support structures
31. Fishes Cartilagenous fishes
Skeleton soft, flexible
32. Fishes Bony fishes
33. Lobe-finned Fishes Coelacanth: the “living fossil”
Fish Out of Time website