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The collection/Cretoxyrhina

EXHIBIT 250

Cretoxyrhina

Cretoxyrhina mantelli

Prehistoric fish

A large Cretaceous lamniform shark whose tail skeleton supports an active swimming reconstruction. [1]

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 / SOURCE-INFORMED RECONSTRUCTION

A life reconstruction from the evidence

Illustrative life reconstruction of Cretoxyrhina in a period-appropriate environment; coloration and missing anatomy are interpretations.

An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. [6]

Source-informed reconstruction. Appearance evidence [6]. 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

Illustrative life reconstruction of Cretoxyrhina in its interpreted aquatic environment.

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[1]
DIETCarnivore (vertebrate feeding supported)Evidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDUnited States[1]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Cretoxyrhina

Cretoxyrhina was a large prehistoric shark that lived in Cretaceous seas. Fossils from Kansas preserve parts of its backbone and tail skeleton. Those pieces support a strong, nearly crescent-shaped tail that could drive active swimming. Researchers estimated one individual at 6.4–7.0 meters long; that is a model for that fossil, not a measurement of every adult. [D1]

Its food included other marine vertebrates. An ecological study used fossil evidence to support feeding on bony fishes and mosasaurs, with plesiosaurs also possible. Feeding evidence does not automatically tell us whether the shark caught a living animal or ate something already dead. [D4]

The name has a history too. A museum tooth from the English Chalk has been recorded under older combinations such as Isurus mantelli. Keeping track of those labels helps researchers recognize the same animal instead of counting it as several different discoveries. [D2]

A later study used tooth chemistry to investigate body temperature and possible migration. That is an indirect way to explore how extinct animals lived. It does not tell us whether sharks traveled together, and the sources reviewed here leave their courtship and social life uncertain. [D5]

PREHISTORIC ANIMAL DOSSIER

A life in profile.

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

Dental fossils, caudal anatomy and tooth chemistry address different questions about an extinct marine predator. [D6] [D1] [D5]

Profile scope: Genus-wide exhibit represented by C. mantelli; catalog period and region follow Kansas material. Its caudal length model estimates one individual, not a species range. [D1]

Time
Late Cretaceous
Fossil locations in this exhibit
United States
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

6.4–7.0 m (individual estimate)

The 2006 caudal skeleton is scaled to body length; this is one fossil-individual estimate, not an adult species range. [D1]

Mass

Not established

Not established here

The reviewed tail study does not establish a reliable mass range. [D1]

Diet

Inferred

Marine vertebrates

The original ecological abstract supports feeding on bony fishes and mosasaurs, possibly plesiosaurs; it does not prove every encounter was hunting. [D4]

Habitat

Source supported

Late Cretaceous marine waters

Kansas fossils occur in Niobrara marine deposits. Burial setting does not specify exact preferred depth. [D1]

Locomotion

Inferred

Fast swimming supported by tail shape

Caudal skeletal elements support a lunate tail and narrow peduncle; speed is not measured. [D1]

Anatomy

Source supported

A large lamniform shark

Sharp cusps and position-dependent tooth shapes occur in Montana material; this dental sample is not a whole-body skeleton. [D6]

Reproduction & life together

Reproduction

Not established

Not established here

Focused searches and reviewed dental studies yield no direct pregnancy, egg or birth fossil for this exhibit. [D6]

Courtship and mating

Not established

Not established here

The reviewed isotope study cannot establish mating displays, and focused searches found no direct evidence. [D5]

Social behavior

Not established

Not established here

Isotope-based possible migration does not establish group travel, schooling or pair bonds. [D5]

Dossier research & sources

Sources and inspection notes for the claims in this profile.

  1. Caudal fin skeleton of the Late Cretaceous lamniform shark, Cretoxyrhina mantelli, from the Niobrara Chalk of KansasNew Mexico Museum of Natural History and Science Bulletin / Shimada, Cumbaa and Van Rooyen (2006) · Accessed 2026-10-08Abstract, Introduction and caudal description inspected: posterior vertebral skeleton, hypochordal rays, lunate-tail inference and 640–700cm individual model. · Inspected: page
  2. Cretoxyrhina mantelli: syntype NHMUK PV OR4498Natural History Museum London · Accessed 2026-10-08Actual collection record inspected through browser/web: syntype tooth from Lewes Chalk and historical Isurus mantelli/Oxyrhina mantelli combinations. Broad record ages are not used as species range. · Inspected: page
  3. Skeleton of the fossil shark Isurus denticulatus from the Turonian of Germany—Ecological coevolution with prey of mackerel sharksPaleontology Journal / Cajus Diedrich (2014) · Accessed 2026-10-08Actual published original PDF inspected, retained from a mirror: title/date, Abstract, Introduction and anatomical comparison sections. Explicit proposed Cretoxyrhina/Isurus synonymy is disputed here, not accepted as settled. · Inspected: page
  4. Paleoecological relationships of the Late Cretaceous lamniform shark, Cretoxyrhina mantelliJournal of Paleontology / Kenshu Shimada (1997) · Accessed 2026-10-08Original abstract inspected: Kansas specimens support vertebrate feeding and possible scavenging relationships; full article not accessible. · Inspected: abstract
  5. Oxygen isotope composition of teeth suggests endothermy and possible migration in some Late Cretaceous shark taxa from the Gulf Coastal Plain, USAPaleobiology (2025) · Accessed 2026-10-08Original Abstract, sampled taxa and isotope interpretation inspected; accepted Cretoxyrhina mantelli usage continues after 2014. Migration and temperature are modeled interpretations, not tracked animals. · Inspected: page
  6. Late Cretaceous sharks Cretoxyrhina and Cardabiodon from Montana, USAActa Palaeontologica Polonica / Siverson and Lindgren (2005) · Accessed 2026-10-08Abstract and Cretoxyrhina systematic description inspected: teeth, juvenile tooth interpretations and regionally variable last appearances; not fossil pregnancy. · Inspected: page

THE STORY IN THE FOSSILS

Reading the evidence

A tooth in a museum can anchor identity even when its labels have changed. The Natural History Museum retains a syntype from the English Chalk at Lewes, recording both the current Cretoxyrhina name and historical combinations. The specimen is a tooth, so that record is an identity reference rather than a complete-body measurement. [2]

Chemical evidence asks a different question. A 2025 study compared oxygen isotopes in Alabama shark teeth and other fishes. Cretoxyrhina values were interpreted in terms of elevated body temperature and possible migration. These conclusions depend on comparisons and environmental assumptions; they do not reveal an individual travel route or prove social migration. [5]

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. Caudal fin skeleton of the Late Cretaceous lamniform shark, Cretoxyrhina mantelli, from the Niobrara Chalk of KansasNew Mexico Museum of Natural History and Science Bulletin / Shimada, Cumbaa and Van Rooyen (2006) · Accessed 2026-10-08Abstract, Introduction and caudal description inspected: posterior vertebral skeleton, hypochordal rays, lunate-tail inference and 640–700cm individual model. · Inspected: page
  2. Cretoxyrhina mantelli: syntype NHMUK PV OR4498Natural History Museum London · Accessed 2026-10-08Actual collection record inspected through browser/web: syntype tooth from Lewes Chalk and historical Isurus mantelli/Oxyrhina mantelli combinations. Broad record ages are not used as species range. · Inspected: page
  3. Skeleton of the fossil shark Isurus denticulatus from the Turonian of Germany—Ecological coevolution with prey of mackerel sharksPaleontology Journal / Cajus Diedrich (2014) · Accessed 2026-10-08Actual published original PDF inspected, retained from a mirror: title/date, Abstract, Introduction and anatomical comparison sections. Explicit proposed Cretoxyrhina/Isurus synonymy is disputed here, not accepted as settled. · Inspected: page
  4. Paleoecological relationships of the Late Cretaceous lamniform shark, Cretoxyrhina mantelliJournal of Paleontology / Kenshu Shimada (1997) · Accessed 2026-10-08Original abstract inspected: Kansas specimens support vertebrate feeding and possible scavenging relationships; full article not accessible. · Inspected: abstract
  5. Oxygen isotope composition of teeth suggests endothermy and possible migration in some Late Cretaceous shark taxa from the Gulf Coastal Plain, USAPaleobiology (2025) · Accessed 2026-10-08Original Abstract, sampled taxa and isotope interpretation inspected; accepted Cretoxyrhina mantelli usage continues after 2014. Migration and temperature are modeled interpretations, not tracked animals. · Inspected: page
  6. Late Cretaceous sharks Cretoxyrhina and Cardabiodon from Montana, USAActa Palaeontologica Polonica / Siverson and Lindgren (2005) · Accessed 2026-10-08Abstract and Cretoxyrhina systematic description inspected: teeth, juvenile tooth interpretations and regionally variable last appearances; not fossil pregnancy. · Inspected: page

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