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