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Forensic Scientific Principles > Entomology > Flashcards

Entomology Flashcards

1
Q

What is a bioindicator?

A

A living organism that can tell us things about the environment that might otherwise be costly or time consuming

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2
Q

What is the order of classification (7)?

A

Kingdom, phylum, class, order, family, genus, species

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3
Q

What is an adult insects exoskeleton made of?

A

Chitin

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4
Q

What makes a fly a fly?

A
  • 1 wing pair
  • 3 leg pairs
  • 1 pair of club-shaped halteres
  • sucking mouthparts
  • short, segmented antennae
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5
Q

What makes a beetle a beetle?

A
  • 2 wing pairs (thick forewing/elytra and membraneous hindwing)
  • 3 leg pairs
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6
Q

What is an exopterygote?

A

Adult and larvae look similar

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7
Q

What is an endopterygote?

A

Adult and larvae look different

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8
Q

Describe the life cycle of a fly

A
  • Imago oviposits
  • Eggs hatch into larvae
  • 1st instar, 2nd instar, 3rd instar larvae (moults as it grows into different stages)
  • 3rd instar enter post feeding stage and move to safety to pupate
  • Imago ecloses from pupae
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9
Q

How can you identify what instar stage a fly larvae is in?

A

Number of slits in posterior spiracles (1,2,3)

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10
Q

Describe the life cycle of a beetle

A
  • Imago oviposits
  • eggs hatch into young larvae
  • larvae undergoes several moulting stages (varies)
  • pupation
  • imago ecloses
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11
Q

What is forensic entomology?

A

using insects to help investigate legal matters

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12
Q

What is urban entomology?

A

Involving pests in the human environment e.g. woodworm, cockroaches

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13
Q

What is stored product entomology?

A

Related to food contamination / spoilage of stored food / biosecurity

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14
Q

What is medico-legal entomology?

A

Using insects to investigate crimes/corpses

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15
Q

Why are insects used in medico-legal entomology?

A
  • they’re everywhere
  • corpse = lots of food
  • insect development is simple/predictable
  • insect habitat preference is simple/predictable
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16
Q

Where do insects oviposit?

A

Mouth, eyes, nostrils, genitals, sites of trauma

17
Q

What are the 4 stages of decomposition?

A
  • bloat
  • active decay
  • dry decay
  • skeletonisation
18
Q

What insect is the first to arrive at the scene and why?

A
  • blowflies
  • antennae very sensitive to volatile organic compounds
19
Q

How far away can greenbottles sense a carcass?

20
Q

What is an example of a volatile organic compound?

A

Sodium sulphides

21
Q

What is fly development massively dependant on?

A

temperature!

Forensic Scientific Principles (17 decks)

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