Fly Life Cycle

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Fly Life Cycle

Insect Succession
The progression of insect life follows a pattern on cadavers, and the developmental rates of flies are relatively predictable.
Note: The length of the life cycle varies between different fly species and is dependent on temperature.
Flies lay eggs usually within the first 24 hours
Predatory rove beetles or parasites that feed on maggots will have to wait until the blow flies arrive and lay their eggs.
Beetles that specialize on bone, will have to wait until bone is exposed.



Blow Fly Metamorphosis
Blow flies are attracted to dead bodies and often arrive within minutes of the death of an animal.
There are distinctive egg, larva, pupa and adult stages which help estimate the time of death.



Stage 1: Eggs
Adult flies lay eggs on the carcass especially at wound areas or around the openings in the body such as the nose, eyes and ears.



Stage 2: Larva
Eggs hatch into larva (maggots) in 12-24 hours.

Stage 3: Molt
Larvae continue to grow and molt (shed their exoskeletons) as they pass through the various instar stages.
Instar- a phase between two periods of molting in the development of an insect larva or other invertebrate animal.

1st Instar - 5 mm long after 1.8 days
2nd Instar - 10 mm long after 2.5 days
3rd Instar – 14-16 mm long after 4-5 days



Stage 4: Pupa
The larvae (17 mm) develop into pupa after burrowing in surrounding soil.

Stage 5: Adult
Adult flies emerge from pupa cases after 6-8 days.



Metamorphosis
Flies, beetles, and many other insects have complete metamorphosis, which consists of four stages – egg, larva, pupa, and adult.

Where to Look For Insects
After the adults mate, the females lay eggs onto corpses - usually near natural body openings or wounds.
Feeding activity is usually seen in the head region first (mouth, nostrils, eyes, ears), followed by the excretory and reproductive openings. The trunk of the body is invaded much later in the process.




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Do you think that if we ever discover enough about alien life and you're still teaching, you'd want to teach about alien life cycles and learn to make inferences about it?

Author — Jocelyn Thomas