Thorax, Abdomen, Wings and Legs Flashcards Preview

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Flashcards in Thorax, Abdomen, Wings and Legs Deck (20)
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1

What are the three segments of the Thorax called?

1. Prothorax
2. Mesothorax
3. Metathorax

2

What is the prothorax dominated by?

The pronotum

3

What is the Pronotum?

A shield that protects the wing bases and neck of the insect

4

What can an insect leg be modified for? (8) Give an example of an insect that has each type of modified leg.

1. Swimming - Cicadas
2. Jumping - fleas
3. Grasping Prey - Prey Mantis
4. Grasping Hosts - Lice
5. Digging - Scarab Beetles
6. Sound Production - Grasshoppers
7. Cleaning/Carrying Pollen - Honeybees
8. Defense - Some leaf insects

5

In which type of insects do the meso and metathoracic segments each have a pair of wings?

Adult pterygote insects

6

Which pterygote insects have only one pair of wings? What happened to the second pair?

Diptera - second pair modified as halteres

7

In some orders, forewings are modified for what?

Protection and Camouflage

8

What kind of forewings do Orthoptera have?

Tegmina (leathery) wings

9

What kind of forewings do Coleoptera have?

Elytra (Hard, sclerotized) wings

10

What kind of forewings do hemiptera have?

Hemelytra (Part membranous, part scleotized) wings

11

In which orders are there some physical mechanisms that lock the fore and hind wings together so that they function as a single unit?

Lepidoptera and Hymenoptera

12

What is the tergum?

The upper sclerite that wraps around the sides of the insects abdomen

13

What is the Sternum?

The lower sclerite of the abdomen

14

In the primitive condition of an insect, how many adbominal segments are there?

11

15

What is a usual characteristic of the first adbominal segment in the primitive condition?

may be reduced/absent/fused to the thorax

16

Pregenital

7 similar segments of the abdomen

17

Ovipositor

adbominal Segemnts 8-9 of an insect - bear external genitalia

18

What is usually characteristic of segment 11 of the abdomen?

It is usually reduced to an epiproct and paraproct which are sclerites surrounding the anal pore. can bare sensory apendages.

19

What is a Cerci?

A pair of sensory appendages on the 11th abdominal segment

20

What are some appendages of the abdomen? (5) What are their functions?

1. Prolegs - unjointed, fleshy legs (aid in walking + sticking on substrate)
2. Gills - involved in exchange of gases
3. Ferculum/collopgore - Jumping apparatus
4. Caudal Filament - central filament present outside of body
5. Corricles - secretion of alarm pheromones