1. The Arthropods
Class Insecta

2. Characteristics
of Class Insecta

3. Characteristics three pairs of walking legs wings usually present
membranous
thing, transparent, criss-crossed with supporting veins
flying wings
scale-covered
butterflies and moths
scales rub off easily
leatherlike
grasshoppers
protect flying wings
horny
beetles
thick shields

4. Characteristics three body segments one pair of sensory antennae head
thorax
abdomen
one pair of sensory antennae

5. Life Processes
of insects
BJU PressArt, biology textbook, pp. 369

6. Life Processes: Insects
movement
three pairs of jointed legs
wings
most have two pairs of chitinous wings
some one pair
some wingless
only invertebrates that can fly

7. Life Processes: Insects
nutrition
ingestion
variety of mouth parts
piercing
siphoning
sponging
chewing

8. Life Processes: Insects
nutrition
digestion
foregut
midgut
hindgut
esophagus
gastric cecum
crop
intestine
gizzard
stomach
rectum
anus

9. Life Processes: Insects
respiration
tracheae
spiracles
highly efficient – oxygen is transported without using the circulatory system
circulation
open circulatory system
tubular heart
excretion
Malpighian tubules extract nitrogenous wastes and pour them into the intestine

10. Life Processes: Insects
response
anterior “brain”
multiple sensory receptors
pheromones – a chemical released by one animal that influences the behavior of another animal of the same species

11. Life Processes: Insects
reproduction
separate sexes
testes/ovaries
seminal receptacle
ovipositor

12. More Insect Classes
Chilopoda – centipedes
Diplopoda - millipedes

13. Insect Metamorphosis

14. Incomplete Metamorphosis
egg case
adult
adult
egg case
nymph
(naiad)

15. Complete Metamorphosis (90%)
eggs
adult
larva
pupa

16. Major Insect Orders chart on page 385
Orthoptera
Odonata
Coleoptera
Lepidoptera
Hymenoptera
Diptera
–ptera = “wing”

17. grasshoppers, locust, crickets, cockroaches
Order Orthoptera
“straight wing”
grasshoppers, locust, crickets, cockroaches

18. dragonflies, damselflies
Order Odonata
“toothed”
dragonflies, damselflies

19. Order Coleoptera
“sheath wing”
beetles

20. Order Lepidoptera
“scale wing”
butterflies, moths

21. Order Hymenoptera
“membranous wing”
bees, wasps, ants

22. Order Diptera
“two wings”
mosquitoes, gnats,
common housefly

23. Control of insects facet page 388
quarantine
insecticides
environmental changes
biological controls

24. The excretory system of the grasshopper consists of
green glands.
nephridia.
kidneys.
Malpighian tubules.

25. What organ allows a female insect to deposit her eggs?
ovipositor
nephridia
seminal receptacle
tympanum

26. Give the organ where an insect perceives each of the following sensations.
smell
taste
touch
vision
hearing
antennae
receptors on mouthparts
tactile hairs
compound/simple eyes
tympanum

27. Insects are capable of both asexual and sexual reproduction.
true
false