Thorax, Abdomen, Wings and Legs Flashcards

1
Q

What are the three segments of the Thorax called?

A
  1. Prothorax
  2. Mesothorax
  3. Metathorax
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2
Q

What is the prothorax dominated by?

A

The pronotum

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3
Q

What is the Pronotum?

A

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

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4
Q

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

A
  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
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5
Q

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

A

Adult pterygote insects

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6
Q

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

A

Diptera - second pair modified as halteres

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7
Q

In some orders, forewings are modified for what?

A

Protection and Camouflage

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8
Q

What kind of forewings do Orthoptera have?

A

Tegmina (leathery) wings

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9
Q

What kind of forewings do Coleoptera have?

A

Elytra (Hard, sclerotized) wings

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10
Q

What kind of forewings do hemiptera have?

A

Hemelytra (Part membranous, part scleotized) wings

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11
Q

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

A

Lepidoptera and Hymenoptera

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12
Q

What is the tergum?

A

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

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13
Q

What is the Sternum?

A

The lower sclerite of the abdomen

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14
Q

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

A

11

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15
Q

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

A

may be reduced/absent/fused to the thorax

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16
Q

Pregenital

A

7 similar segments of the abdomen

17
Q

Ovipositor

A

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

18
Q

What is usually characteristic of segment 11 of the abdomen?

A

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

19
Q

What is a Cerci?

A

A pair of sensory appendages on the 11th abdominal segment

20
Q

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

A
  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