Body length
Not establishedNot established here
Focused searches did not locate a specimen-scoped whole-body length calculation in the inspected skeletal revision. Its 1,190 mm femur is a limb measurement, not total body length. [D1]
EXHIBIT 185
Chilantaisaurus
Chilantaisaurus tashuikouensis
Chilantaisaurus is known from large limb bones in Inner Mongolia. Its head and much of its body remain reconstructed. [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 / FOSSIL VIEW
The evidence in the bones
Image unavailableChilantaisaurus lectotype and associated limbs.The exhibit and its credited image source remain available.
Published photographs of Chilantaisaurus tashuikouensis: lectotype humerus and associated femur, tibia/fibula and metatarsus. The Commons filename says holotype, but the 2008 revision designates a lectotype and paralectotypes. These bones do not preserve an assigned head or total body length. [1]
Chilantaisaurus lectotype and associated limbs · Xu Xing. CC BY 4.0. Converted to WebP and resized proportionally within verified native dimensions; no anatomical edits. Existing Commons crops or figure revisions are retained under the inspected file license.
The photograph or figure shows the credited fossil material; displayed mounts and labels can include interpretation.
02 / MOVIE-STYLE INTERPRETATION
A cinematic imagination
Image unavailableArtistic reconstruction of Chilantaisaurus; colors and restored soft tissues are illustrative.The exhibit and its credited image source remain available.
Original cinematic interpretation of Chilantaisaurus. The lectotype humerus and associated limb material guide this reconstruction. Head, trunk, soft tissues and total proportions are comparative; the image cannot settle its debated placement. Lighting, colors and scenery are artistic choices; this image does not document directly observed behavior. 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[3]
DIETCarnivore (inferred)Evidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDChina[1]
MEET THE ANIMAL
Meet Chilantaisaurus
Chilantaisaurus was a very large predatory dinosaur from Inner Mongolia in China. Its known material includes an upper-arm bone, part of the pelvis and hindlimb bones. These fossils help place it among the two-legged meat-eating dinosaurs. They do not supply a complete skull and body that can simply be measured from nose to tail. [D2]
Its rock formation has a complicated dating history. Regional evidence places the deposits after an older underlying volcanic layer, but a date inferred for another fossil locality is not automatically this animal's exact age. Rocks from nearby places can have different histories. A regional age estimate therefore leaves some uncertainty about exactly when Chilantaisaurus lived. [D3]
The name also needs care. Fossils once called Chilantaisaurus maortuensis are now treated as Shaochilong. Those remains preserve different parts of the skeleton, so comparing them requires more than a shared old label. The fossils of Shaochilong do not supply Chilantaisaurus with a missing skull. [D2]
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
A 580 mm humerus anchors the revised type identity. Associated hindlimbs indicate great size, but excluded teeth and vertebrae cannot supply a securely identified skull or skeleton. [D1]
Profile scope: Genus profile restricted to C. tashuikouensis at Tashuikou. Former C. maortuensis is treated separately as Shaochilong; disputed nonoverlap is conservatively reserved. [D2]
- Time
- Late Cretaceous
- Fossil locations in this exhibit
- 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.
Body mass
InferredAbout 3.59 tonnes; associated-femur model
The 2014 table models IVPP V2884 at 3,590 kg from measured femoral circumference. That femur is associated type-series material, not the lectotype humerus; life stage remains unverified. [D4]
Diet
InferredCarnivory inferred comparatively
Theropod relationships support predatory feeding as a comparative interpretation. The historically associated tooth was excluded, so it is not secure direct evidence of this species’ dentition or meals. [D1]
Habitat & fossil setting
Source supportedUlansuhai deposits; stage uncertain
The Inner Mongolian formation is regionally constrained as post-Cenomanian by underlying basalt. The more specific Sinocephale locality age does not directly date the Tashuikou animal; stage uncertainty remains. [D3]
Movement
InferredBipedal reconstruction from hindlimbs
Large femora, tibiae and a narrow metatarsus support a two-legged theropod reconstruction. Missing axial and cranial regions prevent a complete measured posture or speed estimate. [D1]
Distinctive anatomy
Source supportedVery large humerus and associated leg bones
The designated lectotype is the right humerus, IVPP V2884.1. The remaining limb elements probably belong to the same animal, but that association is an interpretation. [D1]
Reproduction & life together
Reproduction & nesting
Not establishedNot established here
Focused searches did not establish securely assigned eggs, embryos, nests, clutch size, incubation or parental care. Broader theropod evidence cannot identify this genus’s reproductive habits.
Courtship & mating
Not establishedNot established here
No inspected source establishes sexual differences or display structures. A restored head cannot supply horn, crest or courtship evidence.
Social behavior
Not establishedNot established here
A probably associated type series is insufficient to establish herd structure, cooperative hunting or family behavior. Focused searches found no securely attributed behavioral assemblage. [D1]
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People’s Republic of ChinaGeological Magazine; Benson & Xu (2008) · Accessed 2026-10-02Original twelve-page PDF inspected: lectotype humerus, probably associated paralectotypes, excluded tooth/caudals, large limb dimensions and uncertain historical formation age. · Inspected: page
- The osteology of Shaochilong maortuensis, a carcharodontosaurid (Dinosauria: Theropoda) from the Late Cretaceous of AsiaZootaxa; Brusatte and colleagues (2010) · Accessed 2026-10-02Original full PDF inspected, especially pp.37–38: former C. maortuensis is Shaochilong; nonoverlapping remains prevent direct comparison, although contrasting affinities make generic identity unlikely. · Inspected: page
- Description and revised diagnosis of Asia’s first recorded pachycephalosaurid, Sinocephale bexelli gen. nov., from the Upper Cretaceous of Inner Mongolia, ChinaCanadian Journal of Earth Sciences; Evans, Brown, You & Campione (2021) · Accessed 2026-10-02Original author accepted manuscript inspected: Ulansuhai regional chronology from underlying basalt; locality-specific Sinocephale age inference is not directly transferred to Chilantaisaurus. · Inspected: page
- Rates of dinosaur body mass evolution indicate 170 million years of sustained ecological innovation on the avian stem lineagePLOS Biology; Benson and colleagues (2014) · Accessed 2026-10-02Original supplementary mass XLS inspected: C. tashuikouensis IVPP V2884, femur 1,190 mm, measured circumference 432 mm, mass model 3,590.39 kg; maturity not demonstrated by the row. · Inspected: page
THE STORY IN THE FOSSILS
Meet Chilantaisaurus.
The historical name Chilantaisaurus maortuensis became Shaochilong. The two type series do not overlap anatomically; published contrasting affinities argue against synonymy, but the unresolved comparison is retained in the duplicate guard. [2]
A regional date is not an individual date: the 2021 geological review distinguishes different Ulansuhai localities. The catalog therefore avoids a precise numerical age for the Tashuikou specimen. [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.
- The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People’s Republic of ChinaGeological Magazine; Benson & Xu (2008) · Accessed 2026-10-02Original twelve-page PDF inspected: lectotype humerus, probably associated paralectotypes, excluded tooth/caudals, large limb dimensions and uncertain historical formation age. · Inspected: page
- The osteology of Shaochilong maortuensis, a carcharodontosaurid (Dinosauria: Theropoda) from the Late Cretaceous of AsiaZootaxa; Brusatte and colleagues (2010) · Accessed 2026-10-02Original full PDF inspected, especially pp.37–38: former C. maortuensis is Shaochilong; nonoverlapping remains prevent direct comparison, although contrasting affinities make generic identity unlikely. · Inspected: page
- Description and revised diagnosis of Asia’s first recorded pachycephalosaurid, Sinocephale bexelli gen. nov., from the Upper Cretaceous of Inner Mongolia, ChinaCanadian Journal of Earth Sciences; Evans, Brown, You & Campione (2021) · Accessed 2026-10-02Original author accepted manuscript inspected: Ulansuhai regional chronology from underlying basalt; locality-specific Sinocephale age inference is not directly transferred to Chilantaisaurus. · Inspected: page
- Rates of dinosaur body mass evolution indicate 170 million years of sustained ecological innovation on the avian stem lineagePLOS Biology; Benson and colleagues (2014) · Accessed 2026-10-02Original supplementary mass XLS inspected: C. tashuikouensis IVPP V2884, femur 1,190 mm, measured circumference 432 mm, mass model 3,590.39 kg; maturity not demonstrated by the row. · Inspected: page
KEEP EXPLORING
More from the collection
Image unavailableFull-body movie-style Spinosaurus in a dramatic prehistoric landscape; Original artwork.The exhibit and its credited image source remain available.
Spinosaurus
Spinosaurus
This North African spinosaur combined a narrow snout with a tall back sail. Its relationship with water remains actively debated.
CarnivoreMeet this animal
Image unavailableFull-body movie-style Giganotosaurus in a dramatic prehistoric landscape; Original artwork.The exhibit and its credited image source remain available.
Giganotosaurus
Giganotosaurus
This huge Argentine carnivore belonged to Carcharodontosauridae. Incomplete skeletons make its exact size and prey choices difficult to establish.
CarnivoreMeet this animal
Image unavailableFull-body movie-style Carcharodontosaurus in a dramatic prehistoric landscape; Original artwork.The exhibit and its credited image source remain available.
Carcharodontosaurus
Carcharodontosaurus
This giant carnivore lived across North Africa. Its flesh-cutting teeth contrast with the thicker, bone-crushing teeth associated with Tyrannosaurus.
CarnivoreMeet this animal