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8.05 Crime Scene Critters (50 Points)
Complete the following lab report using the lab linked on the Tasks page.
Background
(2 points each)
1.
What role are you serving in this investigation?
forensic entomologist
2.
Describe the crime scene.
The house smells strongly of human decay, A and there is overturned furniture and
broken dishes showing a violent occurred. Two bodies were discovered one near the
kitchen and the other lying in a corner near the window. Blood covered the walls
and floor around it.
3.
Define postmortem interval.
Period between the time of death and when the body is first discovered
4.
What evidence will you use to determine the PMI?
Insects
Species A
Complete the table below with information on Species A. For the development time, list the
range of hours for a specimen in that stage. One row has been partially completed as an example.
Look on the Insect Life Cycle slide for information on size / length.
(9 points—0.5 point per
cell)
Stage
Development
time
(in hours)
Length / Size
(in mm)
Observations
egg
0
-24
3
B
oth ends are roughly the same shape.
Difficult to distinguish between the two.
1
st
instar
25-52
2-4
T
he anterior end is slightly more pointed
than the posterior end.
© ACCESS Virtual Learning 2021
Stage
Development
time
(in hours)
Length / Size
(in mm)
Observations
2
nd
instar
5
3-78
5
-8
The anterior is more tapered and the
hook-
like mouth parts appear. The posterior
is
wider
3
rd
instar
79-128
10-15
Like 2nd instar but the hook-like mouth
parts
and posterior projections are more.
prominent.
migrating
3
rd
instar
129-246
10-15
Same as 3
rd
instar
pupa
247-486
8-12
Shaped like the egg except it is larger
and
darker in color.
adult
486-Death
NA
Develops wings, eyes, and legs and is
now
an insect
Species B
Complete the table below with information on Species B. For the development time, list the
range of hours for a specimen in that stage. One row has been partially completed as an example.
Look on the Insect Life Cycle slide for information on size / length.
(9 points – 0.5 point per
cell)
Stage
Development
time
(in hours)
Length / Size
(in mm)
Observations
egg
0-25
1-3 mm
Both ends are roughly the same shape.
Difficult to distinguish between the two
© ACCESS Virtual Learning 2021
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i. Dimensions
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