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Honey bee stinger revealed as double-piston venom pump

Honey bee stinger revealed as double-piston venom pump

New Capabilities

High-speed video shows two flaps acting as pistons inside a detached stinger

October 12th, 2026: Study published in PNAS

Overview

Updated Oct 22

A honey bee's stinger keeps working after it tears free from the bee. Two flexible flaps inside it slide in opposite directions like pistons, pushing venom out without a pause.

The PNAS study, published October 12, measured each stroke at about 446 micrometres, lasting roughly 0.7 seconds. The University of New South Wales says strong pumping continues for 15 to 70 seconds after detachment, with twitching for up to 10 to 15 minutes.

Why it matters

A venom pump with no motor or muscle could guide designs for tiny implanted drug pumps.

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Key Indicators

2
Collapsible pistons in the stinger pump
Two flexible flaps slide in antiphase to push venom continuously.
15–70 sec
Regular venom pumping after detachment
Strong, steady pumping measured once the stinger separates from the bee.
10–15 min
How long small stinger movements continue
Twitching and smaller movements outlast the pumping phase.
446 µm
Average piston stroke length
Each lancet valve travels about 446 micrometres per stroke.

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People Involved

DR
Dr. Ramirez-Esquivel
First author and postdoctoral researcher, Macquarie University
First author of the PNAS study; listed as a corresponding author
 Dr Sridhar Ravi
Dr Sridhar Ravi
Research project lead, UNSW Canberra
Led the study of the stinger's pumping mechanism

Organizations Involved

University of New South Wales (UNSW Sydney)
University of New South Wales (UNSW Sydney)
University
Lead research institution

Conducted the study with Macquarie University.
Macquarie University
Macquarie University
University
Research partner

Co-conducted the study with UNSW Sydney.
Proceedings of the National Academy of Sciences (PNAS)
Proceedings of the National Academy of Sciences (PNAS)
Peer-reviewed journal
Publication venue

Published the study on October 12, 2026.

Timeline

1 event Latest: October 12th, 2026 · 1 month ago

  1. Study published in PNAS

    Latest Publication

    Researchers reveal the stinger's double-piston venom pump using high-speed video and microCT scans.

Scenarios

1

Bioinspired micropump prototype unveiled

Possible Resolves by Oct 12, 2028

Discussed by: The PNAS study authors and microfluidics researchers

Engineers build a working micropump based on the bee stinger's collapsible double-piston design. The prototype would demonstrate two deformable pistons operating in antiphase within a single chamber, enabling continuous flow without backflow.

2

Similar pump found in other stinging insects

Likely Resolves by Oct 12, 2028

Discussed by: Hymenopteran researchers

Studies of wasps, hornets, or other bees reveal similar collapsible piston mechanisms in their stingers. The finding would show the double-piston pump is more widespread than previously thought.

3

Design principles applied in microfluidic devices

Possible Resolves by Oct 12, 2029

Discussed by: Microfluidics engineers

The stinger's design principles get incorporated into microfluidic devices for drug delivery or lab-on-a-chip applications. This would require demonstrating the collapsible piston concept in a manufactured device.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

early 1900s

The early anatomical sketch of the stinger valves

Biologists noticed the honey bee stinger's internal valves more than a century ago, without working out how they functioned.

Then

The valves' function remained unexplained for over a century.

Now

The 2026 PNAS study finally revealed them as collapsible pistons.

Why this matters now

Shows how a biological mechanism can stay mysterious even after being described for more than a century.

2000

Gecko adhesion mechanism identified (2000)

Kellar Autumn and colleagues at UC Berkeley identified that van der Waals forces from microscopic setae on gecko toes enable the lizard's grip. The finding explained a long-standing biological mystery.

Then

The discovery opened the field of gecko-inspired adhesives.

Now

Synthetic gecko adhesives are now used in robotics and medical applications.

Why this matters now

Like the bee stinger study, it shows how understanding a biological mechanism can inspire engineering innovations.

Sources

(11)
+5
Science PNAS The Conversation CBC News Phys.org The Canberra Times PMC / NCBI EurekAlert! New Atlas University of New South Wales Ars Technica