Size reference
Source supported8.0 mm fossil body reference
H. scimitarus AMNH Bu-FB80 dealate adult female; H. zigrasi’s3.5 mm worker-form specimen is separate, not a full genus range. [D1]
EXHIBIT 226
Haidomyrmex
Haidomyrmex
Prehistoric insect
Haidomyrmex was a Cretaceous hell ant with upcurved jaws; its diet and arboreal habits are anatomical inferences. [1]
TWO WAYS TO PICTURE THE PAST
Science & the silver screen
Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.
01 / SOURCE-INFORMED RECONSTRUCTION
A life reconstruction from the evidence
Image unavailableIllustrative life reconstruction of Haidomyrmex in a period-appropriate environment; coloration and missing anatomy are interpretations.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. [2]
Source-informed reconstruction. Appearance evidence [2]. Original illustration; missing anatomy, coloration and scenery include interpretation.
Fossils constrain this life reconstruction. Missing anatomy, coloration and the environmental scene include interpretation; the dossier explains the evidence limits.
02 / MOVIE-STYLE INTERPRETATION
A cinematic imagination
Image unavailableIllustrative living reconstruction of Haidomyrmex; missing anatomy and exact colors remain uncertain.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. Lighting, coloration and scenery are artistic choices. This image does not document a fossil locality or behavior.
Original artwork · artistic interpretation.
Scientific view: source-informed reconstruction, credited paleoart or specimen-based imagery. Movie-style view: Original artistic interpretation. Reconstructions involve uncertainty.
PERIODLate Cretaceous (Cenomanian)[3]
DIETPredation inferredEvidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDMyanmar[3]
MEET THE ANIMAL
Meet Haidomyrmex
Haidomyrmex was an extinct ant from Cretaceous amber in Myanmar. It belongs to the group often called hell ants because of their unusual heads and jaws. The gallery focuses on Haidomyrmex scimitarus, represented by a female fossil8 millimeters long. She had lost or damaged her wings and is described as dealate. That specimen is not a measured male or the size of every Haidomyrmex. [D1]
Its long jaws curve upward toward a short bristly pad on the face. Other hell-ant genera can have tall horns, but those should not be added to this ant. The jaw apparatus suggests specialized predation, although a familiar-looking hunting scene would go beyond the evidence. Finding prey with a different hell-ant genus does not prove what Haidomyrmex ate. [D2]
Later researchers described both a winged and a wingless queen-form female of Haidomyrmex cerberus and compared them with workers. That helps explain differences between ant castes and supports a social organization hypothesis. The specimens do not preserve the ants cooperating in a colony or laying eggs. A caste identification can therefore tell us something about reproduction without revealing the whole life cycle. [D3]
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
Other hell-ant genera have different facial structures; their preserved prey cannot be assigned to Haidomyrmex. [D2]
Profile scope: Genus — Haidomyrmex; gallery anchored to H. scimitarus dealate adult female AMNH Bu-FB80, Kachin amber, Myanmar. [D1]
- Time
- Late Cretaceous (Cenomanian)
- Fossil locations in this exhibit
- Myanmar
How to read the evidence
Source supported identifies a description documented by the cited source. Inferred marks a reconstruction or functional estimate. Debated marks competing interpretations. Not established means the sources reviewed for this dossier do not support a firm conclusion; it does not mean a behavior never occurred.
A size reference is an estimate, not a population range. Nesting evidence does not by itself establish courtship, mate choice, or lifelong pairing.
Body mass
Not establishedNot established here
The inspected specimen description provides no defensible body-mass estimate. [D1]
Diet
InferredSpecialized predation inferred
Jaw form suggests prey capture; broader feeding and exact jaw mechanics remain debated, with no identified Haidomyrmex meal. [D4]
Habitat
InferredWoody forest surfaces inferred
Long legs and antennae suggest arboreal activity; Kachin amber supplies preservation context, not a known nest. [D1]
Movement
Source supportedLegged adult; wings vary
The focal H. scimitarus female is dealate; H. cerberus includes an alate female, so flightlessness is not genus-wide. [D3]
Distinctive anatomy
Source supportedUpcurved jaws; low facial pad
Haidomyrmex has one petiole and lacks the tall paddle-like horn of other hell-ant genera. [D2]
Reproduction & life together
Reproduction
Source supportedQueen-form females documented
H. cerberus alate and dealate females support caste interpretation; eggs and actual egg-laying remain unestablished here. [D3]
Courtship
Not establishedNot established here
Queen/worker morphology does not record a male–female courtship or mating sequence. [D5]
Social behavior
InferredCaste organization inferred
Queen-form and worker-form fossils support division of labor; nest structure, colony size and direct cooperation remain unknown. [D3]
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- Rediscovery of the Bizarre Cretaceous Ant Haidomyrmex Dlussky (Hymenoptera: Formicidae), with Two New SpeciesAmerican Museum Novitates; Barden & Grimaldi, 2012 · Accessed 2026-10-06Original full author upload inspected: Table1 and systematic descriptions distinguish8.0 mm H. scimitarus dealate female from3.5 mm H. zigrasi worker-form female; main jaw blades, low facial pad, six legs, one petiole. Historical abstract calls both putative workers, but explicit specimen/systematic caste identification controls. · Inspected: page
- New remarkable hell ants (Formicidae: Haidomyrmecinae stat. nov.) from mid-Cretaceous amber of northern MyanmarCretaceous Research; Perrichot, Wang & Barden, 2020 · Accessed 2026-10-06Original author-hosted full PDF captured; genus key and systematics inspected. Haidomyrmex retained separately from other hell-ant genera; low clypeal pad, upward mandibular morphology and inferred predation distinguished from other genera’s tall horns. · Inspected: page
- The first queen-worker association for Cretaceous Formicidae: the winged caste of Haidomyrmex cerberusZooKeys; Guo et al., 2021 · Accessed 2026-10-06Original full EuropePMC body captured and abstract/introduction/systematic and caste comparison passages inspected. Two separate H. cerberus queens (one alate, one dealate) compared with workers; inferred castes do not show queens/workers cooperating inside one amber piece. · Inspected: page
- New haidomyrmecine ants (Hymenoptera: Formicidae) from mid-Cretaceous amber of northern MyanmarCretaceous Research; Lattke & Melo, 2020 · Accessed 2026-10-06Original indexed publisher abstract, species key and natural-history excerpts inspected. H. davidbowiei retained as fourth species; authors discuss uncertainty in jaw interpretation and possible broader feeding. Direct full PDF retrieval was403. · Inspected: excerpt
- Fossil ants (Hymenoptera: Formicidae): ancient diversity and the rise of modern lineagesMyrmecological News; Barden, 2017 · Accessed 2026-10-06Original publisher PDF captured and caste/social discussion inspected: congeneric queen/worker records, stem-ant uncertainty and imaging-color warning. No H. scimitarus egg or courtship behavior established by these passages. · Inspected: page
THE STORY IN THE FOSSILS
Strange jaws, different ant bodies
The description of H. davidbowiei expanded the genus beyond the three species in the 2012 paper. Its authors also reconsidered feeding interpretations, illustrating why unfamiliar jaws deserve qualified explanations. [4]
A note on scale and time
The dossier identifies the scope of each reference estimate. A mount, an individual fossil and a species-wide adult range are different measurements. Comparison metrics remain unavailable where adult scope has not been established. Unknown does not mean zero.
Sources & editorial notes
Sources support the stated claims and scopes. Refer to the evidence notes for uncertainty.
- Rediscovery of the Bizarre Cretaceous Ant Haidomyrmex Dlussky (Hymenoptera: Formicidae), with Two New SpeciesAmerican Museum Novitates; Barden & Grimaldi, 2012 · Accessed 2026-10-06Original full author upload inspected: Table1 and systematic descriptions distinguish8.0 mm H. scimitarus dealate female from3.5 mm H. zigrasi worker-form female; main jaw blades, low facial pad, six legs, one petiole. Historical abstract calls both putative workers, but explicit specimen/systematic caste identification controls. · Inspected: page
- New remarkable hell ants (Formicidae: Haidomyrmecinae stat. nov.) from mid-Cretaceous amber of northern MyanmarCretaceous Research; Perrichot, Wang & Barden, 2020 · Accessed 2026-10-06Original author-hosted full PDF captured; genus key and systematics inspected. Haidomyrmex retained separately from other hell-ant genera; low clypeal pad, upward mandibular morphology and inferred predation distinguished from other genera’s tall horns. · Inspected: page
- The first queen-worker association for Cretaceous Formicidae: the winged caste of Haidomyrmex cerberusZooKeys; Guo et al., 2021 · Accessed 2026-10-06Original full EuropePMC body captured and abstract/introduction/systematic and caste comparison passages inspected. Two separate H. cerberus queens (one alate, one dealate) compared with workers; inferred castes do not show queens/workers cooperating inside one amber piece. · Inspected: page
- New haidomyrmecine ants (Hymenoptera: Formicidae) from mid-Cretaceous amber of northern MyanmarCretaceous Research; Lattke & Melo, 2020 · Accessed 2026-10-06Original indexed publisher abstract, species key and natural-history excerpts inspected. H. davidbowiei retained as fourth species; authors discuss uncertainty in jaw interpretation and possible broader feeding. Direct full PDF retrieval was403. · Inspected: excerpt
- Fossil ants (Hymenoptera: Formicidae): ancient diversity and the rise of modern lineagesMyrmecological News; Barden, 2017 · Accessed 2026-10-06Original publisher PDF captured and caste/social discussion inspected: congeneric queen/worker records, stem-ant uncertainty and imaging-color warning. No H. scimitarus egg or courtship behavior established by these passages. · Inspected: page
KEEP EXPLORING
More from the collection
Image unavailableIllustrative living reconstruction of Wathondara; missing anatomy and exact colors remain uncertain.The exhibit and its credited image source remain available.
Wathondara
Wathondara
Prehistoric insect
Wathondara was a Cretaceous scale insect whose amber fossil preserves a female, wax egg sac and young.
Plant sap feeding inferredMeet this animal
Image unavailableIllustrative reconstruction of Titanomyrma; incomplete anatomy, pose and colors are hypotheses.The exhibit and its credited image source remain available.
Titanomyrma
Titanomyrma
Prehistoric insect
Titanomyrma was an Eocene ant genus with strikingly large winged queens and unresolved ecological details.
UnknownMeet this animal
Image unavailableIllustrative living reconstruction of Gerontoformica; missing anatomy and exact colors remain uncertain.The exhibit and its credited image source remain available.
Gerontoformica
Gerontoformica
Prehistoric insect
Gerontoformica was a stem ant preserved in Cretaceous amber, with fossil evidence informing early cooperation.
Predation inferredMeet this animal