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EXHIBIT 131

Archaeoceratops

Archaeoceratops oshimai

Archaeoceratops was a small beaked plant eater with a modest neck frill and a hornless skull. [1] [2]

Evidence profile

TWO WAYS TO PICTURE THE PAST

Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.

01 / FOSSIL VIEW

The evidence in the bones

Archaeoceratops oshimai holotype skull IVPP V11114 in photographs and interpretive outlines.

Published views of the A. oshimai holotype, IVPP V11114. Outlines include reconstruction; missing frill details remain uncertain. Fossil coloration does not establish living colors or soft tissues. [1]

Archaeoceratops.jpg · Hai-Lu You and Peter Dodson. CC BY 2.0. Proportionally resized Commons preview and converted to WebP; no anatomy edits.

The photograph or figure shows the credited fossil material; displayed mounts and labels can include interpretation.

02 / MOVIE-STYLE INTERPRETATION

A cinematic imagination

Illustrative reconstruction of Archaeoceratops; colors, soft tissues and restored details remain interpretive.

Original cinematic interpretation of Archaeoceratops oshimai. Colors, soft tissues, scenery and missing anatomy are reconstructed artistic choices; this is not a directly observed individual or behavior. The body and living soft tissues are reconstructed; no large horn cores or ceratopsid-style frill are implied. The incipient frill is shown as a restrained backward extension; its complete living outline is reconstructed. 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.

PERIODEarly Cretaceous[3]
DIETHerbivoreEvidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDGansu, China[3]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Archaeoceratops

Archaeoceratops was a small plant-eating dinosaur from Early Cretaceous China. It belonged to the early relatives of the familiar large horned dinosaurs, rather than being a miniature version of their final body plan. A museum reference of about 1.3 metres introduces its scale without identifying a measured adult maximum. Small size alone does not settle maturity. [D2]

Comparative work treats Archaeoceratops as generally moving on its hind legs. That is a reconstructed posture from anatomy, not a directly observed walking sequence or a measured speed. It highlights a useful difference within the wider ceratopsian group: the heavy, four-legged outline of later members should not simply be copied backward onto every earlier relative. [D5]

Its genus includes more than one species from the Mazongshan region. Geological work distinguishes Archaeoceratops oshimai from Archaeoceratops yujingziensis and keeps their settings separate. Correlating the rock layers still involves uncertainty. A species name and a fossil locality are therefore part of the evidence, not interchangeable labels. Combining their measurements or deposits would create a profile more uniform than the actual discoveries justify. [D3]

PREHISTORIC ANIMAL DOSSIER

A life in profile.

The animal, the evidence, and the questions still open.

Its large eye sockets and short frill preserve an early combination of ceratopsian features; much of its skeleton remains incomplete. [D1]

Profile scope: Primarily A. oshimai, represented by holotype IVPP V11114 and the smaller, incomplete paratype V11115. [D1]

Time
Early Cretaceous
Fossil locations in this exhibit
Gansu, China
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.

Length

Inferred

About 1.3 m; museum reference

The museum does not specify a fossil individual, age or reconstruction method. This is not a measured adult or species range. [D2]

Body mass

Inferred

About 9 kg; holotype-scaled model

Paul models IVPP V11114 using reconstructed volume and estimated limb scaling. Incomplete skeleton; maturity unconfirmed. [D6]

Diet

Source supported

Plant eater

The museum classifies it as herbivorous. The beak and cheek teeth indicate food processing, but no reviewed evidence establishes its preferred plants. [D2]

Habitat

Inferred

River-associated continental deposits

A. oshimai comes from Gongpoquan red beds in Gansu. The 2019 working correlation places them in the early Albian Zhonggou Formation; exact correlations remain uncertain. Depositional setting does not define its preferred microhabitat. [D3]

Locomotion

Inferred

Probably mainly bipedal

Comparative studies treat Archaeoceratops as a generally bipedal early neoceratopsian; exact stance, speed and gait are reconstructed. [D5]

Distinctive anatomy

Source supported

Hornless skull with a small frill

The type lacks nasal and orbital horns. Premaxillary teeth accompany its beak; eroded parietals leave the complete frill outline uncertain. [D1]

Reproduction & life together

Reproduction and growth

Not established

Not established here

The 2003 description interprets sutural closure as approaching adult size. This does not establish reproductive maturity, eggs, nests or parental care. [D1]

Courtship and mating

Not established

Not established here

Reviewed cranial studies do not establish mate choice, display rituals or sex-specific ornamentation. A frill alone cannot identify mating behavior. [D4]

Social behavior

Not established

Not established here

The described type and paratype do not provide evidence sufficient to reconstruct herd structure, group size or family associations. [D1]

Dossier research & sources

Sources and inspection notes for the claims in this profile.

  1. Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of NeoceratopsiaActa Palaeontologica Polonica; You and Dodson (2003) · Accessed 2026-10-02Original full 12-page paper inspected: A.oshimai holotype IVPPV11114, smaller paratype V11115, hornless skull, small frill, dentition, incomplete skeleton and maturity limits. · Inspected: page
  2. ArchaeoceratopsNatural History Museum, London · Accessed 2026-10-02Museum profile inspected through indexed page text:1.3m educational reference, herbivory, China and Early Cretaceous. Specimen and maturity unspecified; erroneous nomenclatural year not adopted. · Inspected: excerpt
  3. Introducing the Mazongshan Dinosaur FaunaJournal of Vertebrate Paleontology memoir; You, Morschhauser, Li and Dodson (2019) · Accessed 2026-10-02Original full11-page article inspected. A.oshimai red-bed Gongpoquan occurrence distinguished from A.yujingziensis; working Aptian/Albian stratigraphic correlations and depositional context. · Inspected: page
  4. Cranial osteology of Archaeoceratops oshimai (Ornithischia: Ceratopsia) and phylogenetic evaluation of basal CeratopsiaHistorical Biology; Wang, Zhang and You (online2025; volume2026) · Accessed 2026-10-02Publisher abstract inspected in indexed text; ten autapomorphies support A.oshimai validity. Full paper inaccessible. Published online5October2025; no new measurements inferred from abstract. · Inspected: abstract
  5. What drove reversions to quadrupedality in ornithischian dinosaurs? Testing hypotheses using centre of mass modellingNaturwissenschaften; Maidment, Henderson and Barrett (2014) · Accessed 2026-10-02Original author-uploaded discussion inspected; Archaeoceratops identified as a generally bipedal basal neoceratopsian. Comparative interpretation, not observed gait. · Inspected: excerpt
  6. Mass estimates: supplementary appendix to The Princeton Field Guide to Dinosaurs, second editionPrinceton University Press; Paul (2016) · Accessed 2026-10-02Original appendix methods and Archaeoceratops IVPP11114 row inspected. Approximately9kg reconstructed-volume/limb-scaled model; incomplete type with estimated scaling inputs, not a weighed or demonstrably mature animal. · Inspected: page

THE STORY IN THE FOSSILS

Meet Archaeoceratops

Archaeoceratops combines a cropping beak with a much smaller frill than those of later large horned dinosaurs. Its remains reveal character combinations within early ceratopsian evolution, rather than a confirmed direct ancestor. [1]

The genus includes A. yujingziensis from another Mazongshan setting. Keeping that species separate matters: its size and geological context cannot simply be assigned to A. oshimai. [3]

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.

  1. Redescription of neoceratopsian dinosaur Archaeoceratops and early evolution of NeoceratopsiaActa Palaeontologica Polonica; You and Dodson (2003) · Accessed 2026-10-02Original full 12-page paper inspected: A.oshimai holotype IVPPV11114, smaller paratype V11115, hornless skull, small frill, dentition, incomplete skeleton and maturity limits. · Inspected: page
  2. ArchaeoceratopsNatural History Museum, London · Accessed 2026-10-02Museum profile inspected through indexed page text:1.3m educational reference, herbivory, China and Early Cretaceous. Specimen and maturity unspecified; erroneous nomenclatural year not adopted. · Inspected: excerpt
  3. Introducing the Mazongshan Dinosaur FaunaJournal of Vertebrate Paleontology memoir; You, Morschhauser, Li and Dodson (2019) · Accessed 2026-10-02Original full11-page article inspected. A.oshimai red-bed Gongpoquan occurrence distinguished from A.yujingziensis; working Aptian/Albian stratigraphic correlations and depositional context. · Inspected: page
  4. Cranial osteology of Archaeoceratops oshimai (Ornithischia: Ceratopsia) and phylogenetic evaluation of basal CeratopsiaHistorical Biology; Wang, Zhang and You (online2025; volume2026) · Accessed 2026-10-02Publisher abstract inspected in indexed text; ten autapomorphies support A.oshimai validity. Full paper inaccessible. Published online5October2025; no new measurements inferred from abstract. · Inspected: abstract
  5. What drove reversions to quadrupedality in ornithischian dinosaurs? Testing hypotheses using centre of mass modellingNaturwissenschaften; Maidment, Henderson and Barrett (2014) · Accessed 2026-10-02Original author-uploaded discussion inspected; Archaeoceratops identified as a generally bipedal basal neoceratopsian. Comparative interpretation, not observed gait. · Inspected: excerpt
  6. Mass estimates: supplementary appendix to The Princeton Field Guide to Dinosaurs, second editionPrinceton University Press; Paul (2016) · Accessed 2026-10-02Original appendix methods and Archaeoceratops IVPP11114 row inspected. Approximately9kg reconstructed-volume/limb-scaled model; incomplete type with estimated scaling inputs, not a weighed or demonstrably mature animal. · Inspected: page

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