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EXHIBIT 251

Desmatochelys

Desmatochelys padillai

Marine turtle

An Early Cretaceous marine turtle whose Colombian fossils include a female with preserved eggs. [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 / SOURCE-INFORMED RECONSTRUCTION

A life reconstruction from the evidence

Illustrative life reconstruction of Desmatochelys 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. [1]

Source-informed reconstruction. Appearance evidence [1]. 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 Desmatochelys 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.

PERIODEarly Cretaceous[1]
DIETDiet not established hereEvidence and uncertainty in the dossier
TOTAL LENGTHSee the dossierEstimate scope matters
FOSSILS FOUNDColombia[1]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Desmatochelys

Desmatochelys padillai was an Early Cretaceous marine turtle from Colombia. Its large shell and paddle-like front limbs show a body suited to water. The best-known shell preserves 1.66 meters of length, with the complete carapace estimated at 2.0 meters. That number measures the shell, not the whole animal from head to tail. [D1]

An especially useful fossil preserved eggs inside a female. Researchers counted at least 48 spherical eggs and found that their shells were rigid. The fossil directly shows egg production, but it is not a nest. It cannot tell us the exact beach, hatching success or parental behavior. [D2]

Its scientific identity also needs care. Another species, Desmatochelys lowii, lived much later. Researchers compare the two, but uncertain family relationships do not make their evidence interchangeable. A skull feature or size estimate from one species should not automatically become a fact about the other. [D3]

Older museum material helped the 2015 team recognize D. padillai when more complete fossils became available. That shows why collections matter: a bone stored for decades may become informative when researchers find a missing comparison. New discoveries can improve the interpretation of fossils already in a drawer. [D4]

PREHISTORIC ANIMAL DOSSIER

A life in profile.

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

The two named species are retained in Desmatochelys, while their relationships and species-specific evidence require careful comparison. [D3]

Profile scope: Genus exhibit represented by D. padillai; catalog period and region refer only to this species, not the full genus. Shell dimensions concern FCG-CBP01 and eggs concern FCG-CBP75. [D1] [D2]

Time
Early Cretaceous
Fossil locations in this exhibit
Colombia
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

Carapace estimated at 2.0 m

Holotype FCG-CBP01 preserves 1.66 m of carapace;2.0 m estimates the complete shell, not head-to-tail length. [D1]

Mass

Not established

Not established here

The reviewed comparative study supplies no reliable D. padillai body-mass range. [D3]

Diet

Not established

Not established here

The reviewed comparisons establish skull identity, not a D. padillai menu. [D3]

Habitat

Source supported

Marine; Paja Formation fossils

Colombian material comes from Early Cretaceous marine deposits; exact preferred depth is unestablished. [D1]

Locomotion

Inferred

Paddle-limb swimming

Preserved front limbs are paddle-like; swimming function follows anatomy, while complete soft outlines remain reconstructed. [D1]

Anatomy

Source supported

Large shell and robust front paddles

The holotype includes skull, jaw, cervical vertebrae, front-limb bones and nearly complete carapace; most finger bones are missing. [D1]

Reproduction & life together

Reproduction

Source supported

Direct evidence of eggs

Gravid FCG-CBP75 contains at least 48 spherical, rigid-shelled eggs,32.2–42.8 mm across. This is not a laid nest or observed hatching event. [D2]

Courtship and mating

Not established

Not established here

The gravid fossil establishes egg production, not mate selection or courtship. [D2]

Social behavior

Not established

Not established here

Eggs inside one turtle do not establish nesting colonies, parental care or social groups. [D2]

Dossier research & sources

Sources and inspection notes for the claims in this profile.

  1. Oldest known marine turtle? A new protostegid from the Lower Cretaceous of ColombiaPaleoBios / Cadena and Parham (2015) · Accessed 2026-10-08Original author PDF inspected: Abstract, occurrence, diagnosis, Table 1, carapace and front-paddle descriptions. Table 1 distinguishes 1660mm preserved and 2000mm reconstructed carapace length; not total body length. Relative-placement/oldest claims are qualified. · Inspected: page
  2. A gravid fossil turtle from the Early Cretaceous reveals a different egg development strategy to that of extant marine turtlesPalaeontology / Cadena et al. (2019; online2018) · Accessed 2026-10-08Original PDF inspected: Abstract, geological context, FCG-CBP75 identification, egg-counting Results and Discussion. At least 48 eggs inside the gravid animal, rigid eggshell and 32.2–42.8mm diameters; no laid nest. · Inspected: page
  3. Comparative cranial morphology of the Late Cretaceous protostegid sea turtle Desmatochelys lowiiPeerJ / Irena Raselli (2018) · Accessed 2026-10-08Abstract and comparative systematic/phylogenetic Discussion inspected. Both D.lowii and D.padillai retained in Desmatochelys despite unresolved relationship; D.lowii anatomy is not automatically applied to D.padillai. · Inspected: page
  4. CSUF Scientist’s Study Reveals Oldest Fossil Sea TurtleCalifornia State University Fullerton (2015) · Accessed 2026-10-08Institutional article inspected: old Colombian collection material, later finds and species description. Its 2015 oldest statement is not a permanent unqualified 2026 record. · Inspected: page

THE STORY IN THE FOSSILS

Reading the evidence

Stored specimens can gain new meaning when better fossils arrive. Colombian turtle material collected decades earlier helped researchers recognize the new species after additional finds supplied skulls and shells. The 2015 institutional account emphasizes both old collections and new fieldwork. A species description can therefore connect several discoveries rather than begin with a single spectacular skeleton. [4]

A later specimen answered another question: what eggs did this marine turtle produce? CT scans counted eggs inside the shell, and microscopy showed a rigid eggshell structure. The researchers discussed nesting-environment explanations, but the fossil does not preserve the place where those eggs would have been laid. [2]

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. Oldest known marine turtle? A new protostegid from the Lower Cretaceous of ColombiaPaleoBios / Cadena and Parham (2015) · Accessed 2026-10-08Original author PDF inspected: Abstract, occurrence, diagnosis, Table 1, carapace and front-paddle descriptions. Table 1 distinguishes 1660mm preserved and 2000mm reconstructed carapace length; not total body length. Relative-placement/oldest claims are qualified. · Inspected: page
  2. A gravid fossil turtle from the Early Cretaceous reveals a different egg development strategy to that of extant marine turtlesPalaeontology / Cadena et al. (2019; online2018) · Accessed 2026-10-08Original PDF inspected: Abstract, geological context, FCG-CBP75 identification, egg-counting Results and Discussion. At least 48 eggs inside the gravid animal, rigid eggshell and 32.2–42.8mm diameters; no laid nest. · Inspected: page
  3. Comparative cranial morphology of the Late Cretaceous protostegid sea turtle Desmatochelys lowiiPeerJ / Irena Raselli (2018) · Accessed 2026-10-08Abstract and comparative systematic/phylogenetic Discussion inspected. Both D.lowii and D.padillai retained in Desmatochelys despite unresolved relationship; D.lowii anatomy is not automatically applied to D.padillai. · Inspected: page
  4. CSUF Scientist’s Study Reveals Oldest Fossil Sea TurtleCalifornia State University Fullerton (2015) · Accessed 2026-10-08Institutional article inspected: old Colombian collection material, later finds and species description. Its 2015 oldest statement is not a permanent unqualified 2026 record. · Inspected: page

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