Entomology/Impressions Test Review

Life Cycle of a Blow Fly

Eggs → Larva 1st Instar → 2nd Instar → 3rd Instar →Pupa

PMI (postmortem interval)

The time between death and the discovery of the body

How does temperature affect PMI?

Temperatures higher than 70 degrees will accelerate or speed up the development process, while lower temperatures will cause it to slow down

How does ecology affect PMI?

It can be helpful in determining the rate at which decomposition occurs in a corpse.

How does drugs affect PMI?

May accelerate or slow down the time needed for an insect’s life cycle.

How does species succession affect PMI?

Insect species found on a corpse will vary depending on the age

How does wounds affect PMI?

Speeds up decomposition and creates more insect activity

Scientific term for flies

Diptera

Scientific terms for beetles

Coleoptera

What delays bugs from a body?

The body being wrapped in a material, in a closed room, exposed to outside conditions, etc.

How many eggs can be laid?

Up to 300

How much is consumed by a maggot in a week?

Twice its body weight

What do we use for collecting bugs?

a hand net or an insect net

Impressions

Objects or materials that have retained the characteristics of other objects through direct contact.

Types of Impressions

Patent, Latent, and Plastic

2D Impression

This type of impression is documented using photography. Some impressions may be dusted with fingerprint powder to be photographed or lifted with tape. They may also be collected using an electrostatic dust lifting process.

3D Impression

This type of impression can be documented using photography as well as by casting, which involves using dental stone to preserve the dimensional characteristics of the print

Ted Bundy

He was well known for being convicted by the use of bite mark evidence.

Casting Materials

Dental Stone and Plaster

Class Characteristics

Physical qualities shared by a group of ‘like’ items.

Individual Characteristics

physical qualities that are unique to an individual.

How to get foot length in inches

1 foot = 12 inches

Height formula

Shoe Size Formula

Odentology

scientific name for dentist impression

How many teeth does the average adult have?

32 teeth