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Mezcal Worm in a Bottle Yields Surprising DNA Results

The Owner Press by The Owner Press
August 31, 2025
in Business News
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Mezcal Bottle Worm
Scientists decoded the true id of the mezcal worm, lengthy shrouded in fable. Credit score: Inventory

A genetic examine has lastly solved the thriller of the worm inside mezcal bottles.

Whereas hypothesis ranged from butterflies to weevils, DNA analysis revealed that all sampled larvae came from a single moth species, Comadia redtenbacheri. This insect is a traditional delicacy in Mexico, believed to offer health and even aphrodisiac benefits.

The Mystery of Mezcal’s Worm

A study in PeerJ Life & Environment set out to determine exactly which species of larva ends up in bottles of mezcal. Mezcal, a distilled spirit made from agave, is sometimes paired with orange slices and worm salt, a seasoning blend of chili peppers, salt, and crushed larvae from a species of moth called Hypopta agavis.

For decades, there has been debate over the true identity of the so-called “mezcal worm.” Are drinkers consuming the larva of the skipper butterfly Aegiale hesperiaris, or the moth Comadia redtenbacheri (a species thought to have declined in recent years)? Could the worm actually be a type of weevil, or perhaps an insect that has not yet been identified? To answer these questions, scientists analyzed the DNA of larvae found in 21 different brands of mezcal sold commercially.

Mezcal Bottle
Mezcal is a traditional Mexican spirit distilled from agave plants, known for its smoky flavor and cultural heritage. Unlike tequila, which comes only from blue agave, mezcal can be made from many agave varieties. Credit: Stock

Collecting the Specimens

The larvae were obtained from mezcal bottles purchased between 2018 and 2022. At first glance, they all looked nearly identical, with a defined head capsule and prolegs typical of caterpillars. Some were pale white, while others showed a pinkish-red tint. Of the 21 samples, DNA was successfully extracted and sequenced from 18.

DNA Sequenced Mezcal Worms
Maximum likelihood tree showing the placement of the 18 successfully sequenced mezcal worms (in bold and red) in relationship to publicly available COI sequences of Comadia redtenbacheri (Hammerschmidt) and related Cossidae species. Scale bar = number of substitutions/site. Credit: Photo by Jose I. Martinez

DNA Evidence Revealed

The findings surprised the researchers. Mexico has a long tradition of eating insect larvae, with more than 60 species commonly consumed, among them the Tequila giant skipper (A. hesperiaris), whose name suggests it might also appear in tequila and mezcal.

Instead, the genetic analysis confirmed that every larva tested belonged to a single moth species, Comadia redtenbacheri. This discovery highlights the significance of C. redtenbacheri not only as an iconic part of mezcal culture but also as one of the most widely eaten edible insects in Mexico.

Mezcal Worm
Closeup image showing a worm inside a bottle of “Lajita Reposado” mezcal. Credit: Photo by Akito Y. Kawahara

Adding larvae to Mexican beverages and foods (salts, garnishes, powders, etc.) is driven by health benefits and by beliefs that these larvae contain aphrodisiac properties (Contreras-Frias, 2013). This trend is resulting in greater demand, which is applying pressure to local larval populations.

In response to the declining number of mezcal larvae, researchers have begun to develop methods to cultivate these larvae in captivity.

For more on this research, see Scientists Discover the Unexpected True Identity of “Tequila” Worms.

Reference: “Mezcal worm in a bottle: DNA evidence suggests a single moth species” by Akito Y. Kawahara​, Jose I. Martinez, David Plotkin, Amanda Markee, Violet Butterwort, Christian D. Couch and Emmanuel F.A. Toussaint, 8 March 2023, PeerJ.
DOI: 10.7717/peerj.14948

A version of this article was initially published in March 2023.

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