Messor capitatus
(Latreille, 1798)
European seed harvesting ant
A glossy black seed harvester with big-headed majors that grind tough seeds into ant bread on dry, rocky ground.
Compiled from published sources and keeper reports: I haven't kept this species myself, so treat the care values as starting points.
At a glance
- Nest temperature
- 22–28 °CIn the nest
- Nest humidity
- 50–60 %Seed granaries: 30–50 %
- Hibernation
- ≈ 10–15 °CDec – Feb
- Nuptial flights
- Sep – NovAfternoon flights
- Workers
- ≈ 4–8 mmmajors up to 13 mm
- Queen
- ≈ 13–15 mmOne queen
- Colony size
- ≈ Reaches 5,000 workersGrowth: Fast
- Escape risk
- LowCalm ants that rarely try to escape
Year at a glance
Hibernation : Dec – Feb
Active season : Mar – Nov
Nuptial flights : Sep – Nov
- Afternoon flights
- After rain
Months for temperate Europe and the Mediterranean. The weather decides the exact days, so flights can come earlier or later where you live.
How to recognize it
Glossy, uniformly black workers of many sizes, with big-headed majors that walk slowly and clumsily. Unlike Messor barbarus, the majors have a black head instead of a red one and an angular rear of the thorax instead of a rounded one.
Often confused with
- Messor barbarus
- Messor ibericus
- Messor structor
- Workers4–8 mm
- Majors≤ 13 mm
- Queen13–15 mm
mm
Biology
- Queens
- One queenEach colony has a single queen: never put two queens together once the first workers arrive.In the glossary
- Colony founding
- Fully claustralThe queen raises her first workers without eating, living off her wing muscles and fat reserves.In the glossary
- Workers
- Many sizesThe workers come in a continuous range of sizes, from small minors to large majors.In the glossary
- Defense
- BitesNo sting: the workers defend the colony by biting.
Native range
- Europe
- North Africa
Algeria, Croatia, France, Greece, Italy, Malta, Morocco, Portugal, Slovenia, Spain, Tunisia
Taxonomy
Myrmicinae › Stenammini
Messor
Care at a glance
Difficulty
Why this rating
- Makes it easier: Calm workers that rarely try to escape
- Makes it easier: Fully claustral: the queen needs no food until her first workers arrive
- Makes it easier: Stores seeds, so a missed feeding is not a problem
- Makes it harder: Needs a humidity gradient, with dry granaries and humid brood chambers
Food
- Seeds
- Insects
- Sugar
A seed harvester: seeds can feed the whole colony, with insects and sugar as extras.
Best nests
- 1Ytong nest
- 2Acrylic nest
- 3Naturalistic setup
Notes from keepers
Tip
Give the first workers small seeds such as dandelion or grass seeds, which even the smallest of them can crush on their own. The queen herself can help crack the harder seeds that the first workers cannot open yet.
Tip
They share no liquid food mouth to mouth, so keep water and food available at all times. Cover the water spot with cotton or small stones, because the clumsy workers can drown in open water.
Watch out
They are strong diggers that tunnel through Ytong and softened plaster, mostly where it is damp. Leave a thick wall between the chambers and the glass.
Watch out
Make the winter rest properly cool, not half-way. In a long-running Italian diary, a colony kept at in-between temperatures lost a number of workers in late winter, which a myrmecologist suspected was because the ants were too inactive to make the substances that normally keep mold and bacteria in check, and it recovered once it was warmed up.
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FAQs
10Look at the majors. In Messor barbarus the head of a major is clearly red, while Messor capitatus is black all over, or at most very dark brown, and the top of the propodeum, the rear part of the thorax, is angular in capitatus and rounded in barbarus. The abbreviation cf. in a shop name, as in Messor cf. capitatus, means the seller is not fully sure of the identification, and AntWiki notes that western and eastern Mediterranean populations may turn out to be different species.
In lab experiments, yes. Workers of orphaned colonies laid unfertilized eggs that grew into new workers, which very few ant species can do, and after a long spell without a queen they also began to produce males. Bacteria such as Wolbachia, which cause this in some other insects, were ruled out.
Mostly seeds: the workers carry them home, the majors crack the hard ones, and the colony chews them into ant bread. Keepers add insects, and the ants also eat sweet ripe fruit, but many keepers report that honey is ignored or only taken when the nest runs short of moisture.
Messor capitatus workers measure 4–8 mm, with majors up to 13 mm, and the queen measures 13–15 mm.
Just one. Messor capitatus is monogyne: each colony has a single queen, so never put two queens together once the first workers arrive.
No. Messor capitatus cannot sting: the workers defend the colony by biting.
In temperate Europe and the Mediterranean, Messor capitatus usually flies in Sep – Nov. The weather decides the exact days.
Keep the Messor capitatus nest at 22–28 °C, with 50–60 % humidity in the brood chambers.
Yes. Hibernate Messor capitatus at 10–15 °C, roughly during Dec – Feb.
Messor capitatus is not on the EU list of invasive alien species and is not protected in the countries we checked. Rules differ between countries and can change, so check your local laws first.
Sources and review
- 1
- 2AntWiki: Messor capitatus (country list, and the note by Borowiec 2014 that western and eastern Mediterranean populations may be different species)
Reference · Taxonomy, Biology, Distribution
- 3Wikipedia (German): Messor capitatus (identification, nests and foraging, based on Agosti and Collingwood 1987, Cagniant and Espadaler 1997 and Plowes et al. 2013)
Reference · Taxonomy, Biology, Distribution
- 4
- 5formicarium.it: Scheda allevamento Messor capitatus
Care sheet · Care, Biology, Distribution, Nuptial flights
Showing 5 of 29 sources
Last reviewed
- BiologyWell documented
- Care valuesKeeper consensus
- Nuptial flightsKeeper consensus
Legal status
Not on the EU list of invasive alien species and not protected in the countries we checked. Rules differ between countries and can change, so check your local laws before buying or collecting a queen.
Checked on October 11, 2026
All values are starting points: watch your colony and adjust. Found something wrong or missing?
Suggest a correction
