Length
Source supportedApproximately2 m holotype skull
DORCMG.13,675 is a skull, not a complete body. Its length must not be reported as whole-animal length. [D1]
EXHIBIT 229
Pliosaurus
Pliosaurus kevani
Marine reptile
A large-skulled pliosaur whose Dorset holotype provides a detailed view of a Jurassic marine predator. [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 Pliosaurus 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. [4]
Source-informed reconstruction. Appearance evidence [4]. 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 unavailablePliosaurus kevani restored in a period-appropriate marine setting; colors and missing soft tissues are interpretive.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 Jurassic[1]
DIETCarnivore (inferred)Evidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDUnited Kingdom[1]
MEET THE ANIMAL
Meet Pliosaurus
Pliosaurus was a pliosaurid marine reptile, related to the broader plesiosaur group. The representative here is P. kevani from Jurassic Dorset. Its type fossil is a large skull. That gives scientists detailed evidence about jaws and teeth, while leaving the exact body of this individual incomplete. [D1]
Finding the skull was a patient process. Kevan Sheehan returned to a coastal site after rough weather and collected pieces exposed from a landslide. Specialists then cleaned and joined them. The museum account describes eighteen months of preparation before the specimen could be displayed and studied. [D2]
The reconstructed jaws suggest an animal able to take large prey. Researchers also scanned the skull and built mechanical models of its feeding anatomy. A model can explore what a jaw might do, but it does not prove how this animal hunted, which prey it preferred or its exact maximum bite. [D4]
Other plesiosaurs provide evidence for live birth, including a fossil Polycotylus with a fetus. That helps scientists reason about the broader group, but it is not a Pliosaurus pregnancy. Suggestions about parental care or social living therefore need the same careful distinction between direct evidence and comparison. [D3]
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
Separate skull pieces were recovered over several years and prepared for display. Reassembly allows research on structures hidden inside the fossil. [D2]
Profile scope: Genus exhibit represented by P. kevani, based on skull DORCMG.13,675 from lower Kimmeridgian Dorset; the holotype has no associated body skeleton. [D1]
- Time
- Late Jurassic
- Fossil locations in this exhibit
- United Kingdom
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 holotype lacks associated body remains; no comparable adult kilogram estimate is adopted from this review. [D1]
Diet
InferredLarge animal prey inferred
Robust jaws and teeth support macropredatory interpretation; CT-based biting models do not identify a particular meal. [D4]
Habitat
Source supportedKimmeridge Clay marine shelf
The holotype comes from lower Kimmeridgian Wyke Siltstone at Osmington Bay, Dorset. [D1]
Locomotion
InferredFour-flipper swimming reconstructed
The whole-body restoration uses comparative pliosaurid anatomy and tentatively referred postcrania, not a complete P. kevani holotype. [D1]
Anatomy
Source supportedRobust skull and subtrihedral teeth
The teeth have a flattened outer surface; internal skull structures were investigated with CT. [D4]
Reproduction & life together
Reproduction
InferredLive birth inferred comparatively
Pregnancy evidence is from Polycotylus, another plesiosaur. No P. kevani embryo, litter size or nesting site is established here. [D3]
Courtship
Not establishedNot established here
The inspected skull work supplies no demonstrated P. kevani mating display or identified breeding pair. [D4]
Social behavior
Not establishedNot established here
Parental care and sociality proposed for other plesiosaurs remain hypotheses, not direct Pliosaurus group evidence. [D3]
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- A Giant Pliosaurid Skull from the Late Jurassic of EnglandPLOS ONE · Accessed 2026-10-06Systematic taxonomy, DORCMG.13,675 skull, locality, subtrihedral teeth and tentatively referred postcrania. · Inspected: page
- Weymouth Bay pliosaurWessex Museums / Dorset Museum & Art Gallery · Accessed 2026-10-06Finder,2003–2008 recovery, preparation and CT scanning. Museum superlatives, car-breaking bite analogy and unqualified2.4 m skull estimate are not adopted. · Inspected: page
- Estimating the evolutionary rates in mosasauroids and plesiosaurs: discussion of niche occupation in Late Cretaceous seasPeerJ / NCBI PMC · Accessed 2026-10-06Discussion on reproduction/early life history: gravid Polycotylus comparative evidence and explicit limits of parental-care/social inferences. · Inspected: page
- Functional anatomy and feeding biomechanics of a giant Upper Jurassic pliosaur (Reptilia: Sauropterygia) from Weymouth Bay, Dorset, UKJournal of Anatomy / University of Bristol · Accessed 2026-10-06Original abstract and anatomical/model discussion inspected: CT of DORCMG.13,675; biting modeled, not direct hunting observations. · Inspected: page
THE STORY IN THE FOSSILS
A skull assembled over years.
Kevan Sheehan collected bones as they weathered from a coastal landslide. Recovering different pieces over several years and preparing them for eighteen months transformed scattered material into a researchable skull. [2]
A CT model reveals anatomy hidden inside the skull, while mechanical models test possible biting performance. These tools extend observation, but the calculations remain estimates and do not replay an observed prehistoric hunt. [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.
- A Giant Pliosaurid Skull from the Late Jurassic of EnglandPLOS ONE · Accessed 2026-10-06Systematic taxonomy, DORCMG.13,675 skull, locality, subtrihedral teeth and tentatively referred postcrania. · Inspected: page
- Weymouth Bay pliosaurWessex Museums / Dorset Museum & Art Gallery · Accessed 2026-10-06Finder,2003–2008 recovery, preparation and CT scanning. Museum superlatives, car-breaking bite analogy and unqualified2.4 m skull estimate are not adopted. · Inspected: page
- Estimating the evolutionary rates in mosasauroids and plesiosaurs: discussion of niche occupation in Late Cretaceous seasPeerJ / NCBI PMC · Accessed 2026-10-06Discussion on reproduction/early life history: gravid Polycotylus comparative evidence and explicit limits of parental-care/social inferences. · Inspected: page
- Functional anatomy and feeding biomechanics of a giant Upper Jurassic pliosaur (Reptilia: Sauropterygia) from Weymouth Bay, Dorset, UKJournal of Anatomy / University of Bristol · Accessed 2026-10-06Original abstract and anatomical/model discussion inspected: CT of DORCMG.13,675; biting modeled, not direct hunting observations. · Inspected: page
KEEP EXPLORING
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