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entomology > intro > Flashcards

intro Flashcards

1
Q

true/false a corpse is not a highly nutritional package

A
  • false
  • it is a highly nutritional package
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2
Q

what is the goal for immature insects

A

to obtain lots of food quickly

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3
Q

what is the goal for adult insects

A
  • find mates
  • disperse and find new carcasses
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4
Q

true/false the major problem for insects is the availability of food is unpredictable

A
  • true
  • theyre either in feast or famine
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5
Q

maggot growth has what kind of distribution

A

normal distribution (some come early, others come a bit later)

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6
Q

what are intrinsic factors of variability

A

early, optimal, late colonizers, distance to other nearest corpse, number of colonizers available, intraspecific competition

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7
Q

what are extrinsic factors

A
  • moisture, sun/shade, species that arrive, distance to nearest corpse, rarity of corpses, predators, diseases
  • variability associated w the carcass (size, any drugs they took. how much fat/meat)
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8
Q

true/false maggts prefer muscle over brain

A
  • false
  • brain is lots of fat, which they like
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9
Q

describe the structure of insect cuticle

A
  • polysacharide called chitin
  • layers of chitin stacked to create strong, flexible structural membrane
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10
Q

what are forensically relevant insects used for in cases

A

identifying a time and place

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11
Q

what is the most common use of insects in forensics

A

finding PMI estimations in victims of homicides

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12
Q

true/false immature flies are called larvae

A
  • false
  • they are maggots
  • can be called fly larvae but not larvae on their own
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13
Q

what are some things that show changes in PMI

A
  • weather
  • time eggs are layed
  • when insects hatch
  • when insects arrive
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14
Q

name some sources of variability thata re associated with the carcass

A
  • size of corpse
  • presence of drugs or food
  • health of individuals
  • fat vs lean meat
  • access to carcass
  • exposure to internal organs
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15
Q

what is the hard material of the exocuticle made of

A

a protein called sclerotin

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16
Q

true/false the layering of insect cuticle allows us to age it by counting the cuticular band

A
  • true
  • kinda like counting tree rings
  • at apodeme between the thorax and abdomen
17
Q

insects are externally coated with what

A

wax (cuticular hydrocarbon)

18
Q

what do insects use to breathe

A
  • spiracles
  • or holes connected to tracheal tubes that extend throuhout the body cavity
19
Q

what is the power of insect muscles proportional to

A

the power is proportional to cross section area

20
Q

what are muscles attached to

A

the outside structures

21
Q

what can be used to dissolve the muscles of insects

A

10% conc KOH

22
Q

where are eggs deposited

A
  • various locations
  • generally in folds near cavities and openings
23
Q

how many instars are there in maggot development

A

3 instars

24
Q

true/false maggots are always smooth

A
  • false
  • maggots can be hairy, covered in setae, or smooth
25
Q

what is sued to identify the different instars

A

the mouthparts and spiracle aptterns

26
Q

maggots wander from the corpse and turn into what

A

pupae

27
Q

describe the life cycle of flies

A
  • Flies lay eggs
  • Eggs become active and get nutrition (larvae or maggot stage)
  • Go back to an egg-like stage (pupae)
  • Then become adult flies
28
Q

The specialized structures of maggots are based on what

A

habitat

29
Q

true/false pupae get lighter with age

A
  • false
  • they get darker
30
Q

what is the basic structure of adult flies

A
  • head
  • thorax
  • 2 wings and halters
  • beetles
  • hard front wing
31
Q

where is the sagital plane

A
32
Q

where is the transverse plane

A
33
Q

where are the anterior/posterior ends

A
34
Q

what part of the body is this and why do we care

A
  • this is the thorax
  • the location of the presence of the hairs can be used to identify the species
35
Q

where is the head

A
36
Q

where is the thorax

A
37
Q

where is the abdomen

A
38
Q

what is this

A

the side view of the thora

39
Q
A

entomology (10 decks)

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