forensic science insects
A body is discovered. No rigor or lividity is present, but the body is pale. Approximate PMI
0-20 minutes
blowfly eggs usually hatch in less than
24 hours
You find a body still warm, but stiff. Approximate PMI
3-8 hours
When a fly lands on a body, it lays approximately ____ eggs.
300
Who studied the life cycle of insects?
Bergeret
how many larvae stages are included in the 6 stages of a blowfly?
3
name of entomologist who used the concept of insect succession to determine which of 4 different tenants had murdered an infant
Bergeret D' Arbois
Type of insects that come in the dryer stages of decomp
beetles
spiracles on the posterior end of the blowfly larva are two circular regions that contain slits used for
breathing
what part of their anatomy do blowfly larvae breathe through?
butt
As a dead body decomposes two gases putrescine and.... are released that alert blowflies to a possible location to lay their eggs
cadaverine
Occurs within 4-10 days
bloat
`The study of insects
entomology
the arrival of the.....beetle is associated with the advanced stage of a dead body
hide
one the earliest cases to use.... evidence (1247 Chinese work by Sung Tz'u called the washing away of wrongs)
insect
Life stage of a larvae
instar
how do the temperatures of feeding maggots compare to ambient temps?
it speeds up devolpment
flesh flies arrive within minutes of death and deposit....on to flesh
living
The color of death
livor mortis
the decomposition.... of the body are fresh, bloated, decay, active decay, & dry decay.
stages
for most insects what temp. represents their lower limit threshold?
10 degree celcius
Initial decay occurs between days
11-20
The year the first forensic entomology textbook was written
1986
The year the first forensic entomology reference book was written
1998
A body is found in bed and his back is purplish-red. When touched, the area turns white. Rigor is seen in head and neck. Estimated time of death.
2-8 hours
while processing a crime scene for insect evidence, how many maggots per mass should be collected?
50
Current body temperature of 84° F . Time of death
9.7 hours
blowflies do...lay eggs at night
NOT
odor emitted from a dead body can be detected by blowflies from
a mile away
number of hours it takes an inspect species to reach a particular stage of development is expressed in:
accumulated degree hours
blowflies known as...
carrion flies or bottle flies
The four main categories of flies that are found at a crime scene
cheese skipper, blow fly, flesh fly, and house fly
name two types of beetles that are likely to arrive early on a corpse?
clown and Surinam carion
Abdominal wall breaks and allows gases to escape
decay stage (black putrefaction)
The breaking down of dead organic matter into its constituent minerals and elements.
decomposition
List the 5 stages of decomposition in order
fresh, bloated, decay, late decay, and dry
three body segments of insect
head, thorax, abdomen
insects that suck up liquids may get.... from moister parts of the body during softer earlier stages of decomposition
nourishment
to provide the most accurate estimate of postmortem intervals at a crime scene which type of larvae should be collected?
oldest larvae
Brouradel
performed an autopsy of a newborn to determine time of death based on insect activity
A scientific term that means cold blooded. This is used to describe maggots because they must collect heat in order to develop.
poikiolothermic
environmental conditions affect the growth of larvae. it is suggested that......amounts be recorded for a period of 1-2 week before the disappearance of the victim and 3-5 after they're found
rainfall
A body that has been decomposing outside for 30 hours
receding rigor, full lividity and a lot of flies and a few small maggots who may have recently hatched
coffin flies are about the...of fruit flies and likely to appear if the victim is concealed or wrapped in plastic or blankets & an indication that a body was left in a ....for several days
size and car
The structure allows a larvae to breathe and allows scientists to identify species.
spiracles
Post-Mortem Interval
the amount of time that has elapsed since a person died
Physical characteristics of the body you would expect to see during dry decay.
the body would be composed mainly of hair and bones
Megnin
the first scientist to extensively study the use of insects in legal matters
the feeding larvae may have human tissue stored in their crops that can be analyzed to determine: the deceased where exposed to:
toxic chemicals or recreational drugs
