Lecture 3 - Thorax, Abdomen, Wings, Legs

Question 1

The combination of mesothorax and metthorax is known as

Answer 1

pterothorax

Question 2

Function of the thorax

Answer 2

Locomotion

Question 3

The first pair of the leg is attached to the

Answer 3

prothorax (foreleg)

Question 4

The second pair of the leg is attached to the

Answer 4

mesothorax (middle leg)

Question 5

The third pair of the leg attached is known as the

Answer 5

metathorax (hind legs)

Question 6

The first pair of wings are attached to the

Answer 6

mesothorax

Question 7

The second pair of wings are attached to the

Answer 7

metathorax

Question 8

Pronotum

Answer 8

The prothorax is covered by the pronotum (shield) that protects the wing and neck of the insect

Question 9

Each region of the thorax is comprised of 3 parts:

Answer 9

Notum (Top)
Pleuron (Side)
Sternum (Bottom)

Question 10

The mesothorax is divided into

(2)

Answer 10

alinotum and the postnotum

Question 11

The alinotum bears the face and is divided into

(3)

Answer 11

3 segments: Prescutum, Scutum, Scutellum

Question 12

Function of the pleural suture

Answer 12

It is used to form a point of articulation w/ the coxal cavity and divides the pleuron into episterum (Anterior) and epimeron (posterior)

Question 13

Components of the insect legs

(5)

Answer 13

a. Coxa

b. Trochanter

c. Femur

d. Tibia

e. Tarsus

Question 14

Coxa

Answer 14

Proximal segment that is attached to the body of the insect

Question 15

Trochanter

Answer 15

Provides wide range of movement in the insect)

Question 16

Femur

Answer 16

provides power and muscle

Question 17

Tibia

Answer 17

Use as a kicking device in an insect

Question 18

Insect leg: Swimming

2

Answer 18

Aquatic Hemiptera and Coleoptera

Question 19

Insect Leg: Jumping

(3)

Answer 19

Orthoptera, Hemiptera, Fleas

Question 20

Insect Leg: Grasping Prey

(2)

Answer 20

Praying mantids, giant water bug

Question 21

Insect Leg: Grasping host (2)

Answer 21

Lice, other ectoparasites

Question 22

Insect Leg: Digging (2)

Answer 22

Scarab beetles, some crickets

Question 23

Insect Leg: Sound Production (1)

Answer 23

Grasshoppers

Question 24

Insect Leg: Cleaning and carrying pollen (1)

Answer 24

Honeybee

Question 25

Insect Leg: Defence

Answer 25

Some leaf insect

Question 26

Insect Wings

Answer 26

Adult pterygote insects consists of 2 pairs of wings

Question 27

Exception of Insect Wings (2)

Answer 27

However there is an exception for insects that consists of ONLY 1 pair of wing (Diptera - house flies) The pair of wings are attached to the mesothorax used for protection and camouflage and the hind wings are modified to be known as halteres

Question 28

Characterization of an insect wing: Orthoptera

Answer 28

Orthoptera consists of tegmina (which are leathery and hard)

Question 29

Characterization of an insect wing: Coleoptera

Answer 29

Coleoptera consists of elytra (which are hard and sclerotized) used to protect the membranous hind wings

Question 30

Characterization of an insect wing: Hempitera

Answer 30

Hemiptera consists of forewings known as hemelytra (these are partial sclerotized wings and partial membraneous)

Question 31

Insect Abdomen (2)

Answer 31

The abdomen consists of the dorsal surface known as the tergum and the ventral (lower sclerite) known as the sternum There are 11 abdominal segments whereas there are only 6-7 segments in the abdomen of the flies and beetles

Question 32

Component of the Insect Abdomen (1-7) segment

Answer 32

There are usually 1-7 similar segments known as pregenital

Question 33

Component of the Insect Abdomen (8-9)

Answer 33

Segment 8-9 bear the external genitalia (eg. Ovipositor found in female to lay eggs)

Question 34

Component of the Insect Abdomen (10)

Answer 34

Is usually present

Question 35

Compoent of the insect Abdomen (segment 11)

Answer 35

Segment 11 is usually reduced to the epiproct and paraproct (sclerites surrounds the anal pore), consisting of a sensory appendages known as the cerci

Question 36

Component of the Insect Abdomen (Anus)

Answer 36

Anus is present at the end of the insect that is surrounded by the 2 paraproct and 1 dorsal plate known as the epiproct

Question 37

Cercus

Answer 37

sensory touch and structures located near the anterior margin of the paraproct

Question 38

Female Abdomen (2)

Answer 38

The female abdomen consists of the ovipositor The ovipositor consists of 4 valvifers and 6 valvulae

Question 39

Male Abdomen

Answer 39

The male abdomen consists of the aedeagus (penis)

Question 40

Other Abdominal Appendages (7) + Description

Answer 40

a. Other abdominal appendages include prolegs (pseudopods) in lepidopteran larvae b. Gills in the aquatic larvae c. Claspers d. Styli e. Cerci (earwigs, cockroaches) f. Pseudo legs (caterpillars) g. Cornicles (Aphids) Secreting Pheromones