ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

What Is Forensic Entomology?

Updated on January 22, 2018
Entomologist at work.
Entomologist at work. | Source

'Who saw him die?'
'I', said the fly
'With my little eye,
I saw him die.' — Anonymous

Definition of Forensic Entomology

Forensic entomology is the study of insects associated with a human corpse in order to determine elapsed time since death. Insects and their remains collected at a crime scene are often used as evidence in a variety of court cases including but not limited to murder. The primary purpose of a forensic entomologist is to determine the time which has elapsed since the murder of an individual. However, abuse cases and some civil cases have also employed forensic entomologists when insect activity is implied in evidence.

Forensic entomologists, typically employed by academic institutions not law enforcement agencies, may also be called to provide evidence of the following:

  • that the body had been moved to a secondary site either by animals or the killer.
  • that the body was disturbed at some time after death.
  • insect activity may determine the presence and position of wounds
  • analysis of insects found on a body may determine the presence of drugs
  • insects or remains present on a suspect or suspects vehicle may place the suspect at the scene of the crime
  • insect evidence may be used in civil cases
  • child or senior abuse cases may benefit if insects have colonized wounds

In the midst of all this decay, death calls in reinforcements. — Heather Pringle

History of Forensic Entomology

  • Its first use was reported in 1235AD China.
  • During the Middle Ages, sculptors, painters and poets closely observed the decomposition of bodies by insect action and depicted their observations through their works.
  • It was used sporatically in the 19th C.
  • It was used sporatically in the early 20th C, playing a part in some major cases.
  • In France and Germany, during the 18 and 1900s mass exhumations provided evidence that maggots played a major role in the decomposition of human cadavers.
  • From May 1899 to September 1900, medical examiner Eduard Ritter von Niezabitowski placed aborted fetuses, cat, fox, rat, mole and calf carcasses on a windowsill and in a nearby vegetable garden providing proof that human cadavers share similar insect succession with both vertebrate and invertebrate creatures.
  • In the 1920s, species lists and monographs were published of forensically important species of insects.
  • In 1996, the American Board of Forensic Entomology (a certification board for forensic entomologists) was formed.

: A flesh fly, probably Sarcophaga nodosa feeding on decaying flesh.
: A flesh fly, probably Sarcophaga nodosa feeding on decaying flesh. | Source

Criminal Cases In Which Forensic Entomology Played A Major Role

  • The first documented forensic entomology case was recorded by the Chinese death investigator Sung Tzu in Hsi yüan chi lu where a stabbing at a rice field was determined to be by a sickle which attracted blow flies due to traces of blood. The owner of the sickle confessed to the murder.
  • The first modern case where PMI (post mortem interval) was used was in the case of an infant found entombed in the walls of a house. The French doctor Bergeret provided evidence on Blow flies and larvae associated with the corpse and although his estimation of life cycle data was not accurate, he made an attempt based on knowledge at the time in estimating time since death of the infant and a determination of the killer was made based partially on that evidence.
  • The murder of the wife and maid of Dr. Buck Ruxton who were discovered in a ravine in Dumfriesshire, Scotland in 1935 was closed due to insect evidence. The bodies contained blowfly larvae which provided a vital clue as to the time of the murders and resulted in the conviction of Dr. Ruxton.

Major Insect Families of Interest to Forensic Entomologists

Major Fly Families
Major Beetle Families
Family Calliphoridae: Blow flies
Family Silphidae: Carrion beetles
Family Sarchophagidae: Flesh flies
Family Dermestidae: Skin, Leather, Hide Carpet and Larder beetles
Family Muscidae: Muscid flies
Family Staphylinidae: Rove beetles
Family Piophilidae: Skipper flies
Familiy Histeridae: Clown beetles
Family Scathophagidae: Dung flies
Family Cleridae: Checkered beetles
Family Sepsidae: Black Scavenger flies
Family Trogidae: Hide beetles
Family Sphaeroceridae: Small and minute dung flies
Family Scarabaeidae: Scarab beetles
Family Stratiomyidae: Soldier flies
Family Nitidulidae: Sap beetles
Family Phoridae: Humpback and scuttle flies
Family Psychodidae: Moth and sand flies and Owl Midges

Forensic Entomology Glossary

  • Degree day - a unit measuring how hot or cold it has been during a specific 24 hour period. Every insect species needs a certain number of degree-days to complete their development. One degree-day is equal to the amount of development that occurs in one day when the temperature lies one degreee above the lowest temperature threshold of that insect's ability to grow.
  • ADD or Accumulated Degree Days - .Each day the temperature is above the lowest developmental threshold, the more degee days that accumulate. For example, 5° above the lowest developmental threshold in a 24 hour period is equal to 5 degree days.
  • Entomologist - a scientist who studies insects.
  • Forensic entomology - the study of insects associated with a human corpse in order to determine elapsed time since death or injury to be applied as reliable evidence in criminal or civil cases.
  • Instar - The stages of an insect or arthropod between moults.
  • Larvae - a stage of development in the life cycle of an insect. They are also referred to as maggots (mainly in reference to fly larvae) and do not have legs or noticeable heads.
  • Moult - When the insects or arthropods shed their exoskeleton (outer body covering).
  • Physiological time - this is a measure of how much heat is required to complete an organism's development.
  • PMI - Post-mortem Interval also known as time of death.

Faunal Succession On A Corpse

As a corpse decays, insects arrive in a predictable sequence. This predicatable appearance of various organisms is known as insect succession or faunal successoin.

  • Succession patterns are determined by entomologists for a variety of regions and conditions through the use of controlled experiments.
  • The information from these experiements is used to determine PMI of a corpse in a crime scene.

A number of environmental factors affect the development of individual organisms and the faunal succession:

  • season (average daily temperature)
  • sun exposure
  • location of the body (inside a building or car, in an urban or rural setting
  • body discovered immersed in water or on dry land
  • body found on the ground, or burnt or hanged also will affect faunal succession.

Estimating Time Of Death

Estimating the PMI is the most important function of the forensic entomologist. Two main factors are relevant in determining PMI:

  1. the time taken for each fly species to reach the body;
  2. the rate of development for each species.

Forensic entomologists need to determine the age of the insects on the body since it is known that insects arrive at a body shortly after death and in a particular order. In order to accomplish this feat, the insects on the body must be identified to the species level. Most species are identifed using a classification key.

Typical Sequence Of Insect Arrival On A Cadaver

Succession Wave
Approximate Time of Arrival
State of Corpse
Age of Corpse
Blow flies (Calliphoridae)-spring/summer
From minutes to several hours
First three months
Winter gnats (Trichocera sp.) - fall/winter
Blow flies and Flesh flies
From minutes to several hours. Usually arrive after Blow flies but may arrive first in some circumstances.
Dermestid Beetles
Fats are rancid
3-6 months
Various flies
Various flies and beetles
Ammonia fermentation
4-8 months
Mites/ Piophila casei (Cheese skippers)
6-12 months
Dermestid Beetles
Completely dry
1-3 years
3-5 years

Skills Required by Forensic Entomologists outside the Parameter of Traditional Entomology

  • Must be fluent in the procedures of law enforcement and law.
  • Must be able work well with law enforcement personnel.
  • Must be able to work well within the influence of time constraints and media attention.
  • Must be able to deal with unique situations that differ from conventional entomology.

Educational Requirements For A Forensic Entomologist

In order to become a forensic entomologist the following educational requirements are a must:

  • Earned M.S. or Ph.D. in Entomology
  • Graduate coursework which specializes and concentrates on the forensic application of entomology
  • At least five years of case experience applying principles of forensic entomology.
  • Five case exemplars available to submit to the review board (American Board of Forensic Entomology)
  • Pass a written examination with a score of 80% or higher.
  • Pass a practical examination and case work-up on a mock case with a score of 80% or higher.

Resources Used

Anderson, Gail. Forensic Entomology: The Use of Insects in Death Investigations.

Hall, Martin. Natural History Museum. Maggots and murders: Forensic entomology. 2012.

Benecke, Mark. Forensic Science International. A brief history of forensic entomology. 2001.

University of Western Australia Center for Learning Technology. Forensic Investigations. Forensic Entomology. December 13, 2007.

Click thumbnail to view full-size
College Station, Texas Ruler in use at a mock crime scene Example of a pig carcass (Sus scrofa) in the active decay stage of decomposition. Notice the extensive maggot feeding and the formation of the "cadaver decomposition island" (CDI) around the carcass (dark staining).
College Station, Texas Ruler in use at a mock crime scene
College Station, Texas Ruler in use at a mock crime scene | Source
 Example of a pig carcass (Sus scrofa) in the active decay stage of decomposition. Notice the extensive maggot feeding and the formation of the "cadaver decomposition island" (CDI) around the carcass (dark staining).
Example of a pig carcass (Sus scrofa) in the active decay stage of decomposition. Notice the extensive maggot feeding and the formation of the "cadaver decomposition island" (CDI) around the carcass (dark staining). | Source


    0 of 8192 characters used
    Post Comment
    • Teresa Coppens profile imageAUTHOR

      Teresa Coppens 

      7 years ago from Ontario, Canada

      Thanks for reading and commenting. Glag you enjoyed it and could relate on a personal level.

    • Sharkye11 profile image

      Jayme Kinsey 

      7 years ago from Oklahoma

      Very interesting hub! The entomology aspect was always my favorite part about the original CSI show, and lately I have seen it crop up more and more in different books and case studies too. When we ran our ranch, we used a crude sort of entomology everyday to determine things about the livestock. Maybe that is why it is so fascinating to me.

      You did an amazing job compiling this information. The formatting and arrangement is beautiful!

    • Teresa Coppens profile imageAUTHOR

      Teresa Coppens 

      7 years ago from Ontario, Canada

      Thaks billy. I too am a big mystery fan. I'm also a biology major and if I could have a do over in life this would actually be a career I would consider. Glad you enjoyed the hub!

    • billybuc profile image

      Bill Holland 

      7 years ago from Olympia, WA

      I read a lot of mysteries and more and more I am seeing this in the plot, so I'm at least a little aware of what this hub is about. Great job of compiling information, Teresa!


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)