Name the three types of insects of forensic interest.
Necrophagous, Parasitic, and Predators.
4 of 30
Which species of fly are the initial colonisers?
Calliphoridae (blow flies).
5 of 30
How do flies detect odours?
Using sensilla on antenna.
6 of 30
Describe blow fly eggs (colour and size).
White/pale yellow in colour, 1.5mm by 0.4mm.
7 of 30
There are three larval stages. What are the sizes for (a) First instar, (b) Second instar, (c) Third instar?
(a) 1-2mm, (b) 2-10mm, (c) 10-16mm.
8 of 30
True or false: The number of slits in posterior spiracles relate to the instar?
True.
9 of 30
How do larvae feed?
They continually produce digestive enzymes, and the pharyngeal pump sucks up liquid food.
10 of 30
How do maggot mass compositions vary?
They can be homogenous (one species present), or heterogenous (different species of fly present).
11 of 30
What happens in the latter 3rd instar stage?
Crop shortens and disappears.
12 of 30
Where does pupation occur and what happens?
In the top 2-3cm of soil, and the outer cuticle hardens and tans.
13 of 30
What happens during adult emergence?
The tip of the puparium splits off and breaks into two, the adult forces off the operculum and escapes the puparium and digs its way up through the soil.
14 of 30
Describe the newly emerged fly.
Pale and has crumpled wings.
15 of 30
How long does it usually take for a fly to become fully expanded and pigmented?
24 hours.
16 of 30
Describe how you would keep eggs alive.
Place on a moistened tissue paper in a vial, the vial should allow entry of air but prevent escape of hatched maggot.
17 of 30
If you are keeping first-third instar larvae alive, what do they need?
A food supply - commonly pig's liver.
18 of 30
If you are keeping post-feeding larvae and pupae alive, what do they need?
Suitable pupation area - sawdust/sand.
19 of 30
How would you kill adult flies?
Put them in an ethyl-acetate kill jar, or a freezer for one hour.
20 of 30
How would you preserve adult flies?
Put them in a vial with 70-95% ethanol, or pin them.
21 of 30
Give three reasons why you would kill/preserve insect specimens.
Identify to a species level, Provide a permanent archive of evidence, and Confirm future identifications.
22 of 30
What three things do you need to know to calculate mPMI?
1) Species of insect, 2) Age of insect, 3) Temperature of location.
23 of 30
Why is there a relationship between rate to insect growth and temperature?
Growth and development has a cost in terms of a 'physiological development energy budget.
24 of 30
What can the number of accumulated degree hours (ADH) or accumulated degree days (ADD) be used for?
Determining the amount of time a corpse has been colonised by blowfly larvae (and then mPMI).
25 of 30
When should ADH be used?
If victims have been missing for less than a month.
26 of 30
When should ADD be used?
If victims have been missing for more than a month.
27 of 30
How do you calculate ADH?
Time (hours) x (Temperature - Base temperature).
28 of 30
How do you calculate ADD?
Time (hours/24) x (Temperature - Base temperature).
29 of 30
Name three influencing factors in blowfly behaviour.
Habitat preference, Location and condition of the body, and Weather conditions.
30 of 30
Other cards in this set
Card 2
Front
What does medico-criminal entomology deal with?
Back
Insects colonising a corpse or living person (abuse or neglect).
Card 3
Front
What are the five stages of decomposition?
Back
Card 4
Front
Name the three types of insects of forensic interest.
Comments
No comments have yet been made