Puparium
Definition
The hardened, barrel-shaped case formed from the last larval skin when a blow fly larva pupates. Puparia are dark brown and can be found in clothing, body bag folds, and soil. Their development time extends the PMI window.
- Formation
- Hardened case from the last larval skin during pupation
- Appearance
- Dark brown, barrel-shaped
- Search locations
- Clothing, body bag folds, soil beneath a body
- PMI relevance
- Its development time extends the estimable interval
Common questions
Why do puparia matter more than live larvae in older death investigations?+
Puparia persist long after the adult fly has emerged and left, so finding empty puparial cases can indicate colonisation occurred well before discovery, extending the postmortem interval estimate beyond what larval evidence alone would show.
How can an examiner tell if a puparium is empty or still occupied?+
An empty puparium shows a cleanly detached operculum where the cap was pushed off during eclosion, while an intact, unopened puparium indicates the fly inside has not yet emerged.
Related terms
- Body Bag
- The sealed bag used to transport the body from scene to mortuary. Treated as a collection zone because migrating larvae, puparia, and...
- External Examination
- The stage of the autopsy in which the pathologist examines the body surface, documents injuries, and removes clothing before any incisions are...
- Instar
- A developmental stage between moults (ecdysis). Blow flies have three larval instars (L1, L2, L3), each ending when the larva sheds its...
- Internal Cavity Insects
- Larvae or puparia found inside the skull, thorax, or abdomen during internal autopsy examination. They often represent colonisation through wounds or extended...
- Maggot Mass Documentation
- The photographic and physical record of each maggot mass location, volume, instar, and temperature taken at the start of autopsy before any...