OBJECT DOSSIER · SMITHSONIAN OPEN ACCESS

Armored aquatic reptile — Vancleavea campi

SAGE Museum Deep Time scientific dossier

Artist / Creator

https://www.si.edu/object/vancleavea-campi-long-murry-1995:nmnhpaleobiology_3448964

Date / Period

Late Triassic — Rhaetian for the Smithsonian specimen · Late Triassic.

Object Type

cast

Medium

unknown_needs_review

About This Object

Geologic period: Late Triassic — Rhaetian for the Smithsonian specimen

Age: Late Triassic.

Feeding: Predatory aquatic feeding is inferred from skull and tooth anatomy.

Locomotion: Semiaquatic locomotion, with the tail playing an important role in movement through water.

Body plan: Long-bodied reptile with small limbs, a deep tail and multiple distinctive forms of overlapping osteoderms.

Evidence: Nearly complete skeletons preserve body armor, skull, small limbs and tail anatomy consistent with semiaquatic specialization.

Why it matters: Vancleavea reveals just how experimental archosauriform evolution became during the Triassic. Its body form has no close modern equivalent.

Plain Language Identity: A bizarre armored Late Triassic archosauriform with strong adaptations for a semiaquatic lifestyle.

What You Are Looking At: A cast based on fossil skeletal material of Vancleavea campi.

Defense Or Attack: Extensive body armor consisted of overlapping osteoderms.

Ecosystem: Late Triassic river and floodplain systems of western North America.

Preservation: Visitor object is a cast based on fossil material.

Formation: Chinle Formation for the Smithsonian specimen.

Find Location: New Mexico, United States, for the Smithsonian specimen.

Research History: Phylogenetic studies place Vancleavea outside crown Archosauria but within Archosauriformes.

Open Questions: Do not call Vancleavea a crocodilian or dinosaur. Its placement is on a separate stem-archosauriform branch.

Source Urls: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list; https://www.si.edu/object/nmnhpaleobiology_12307215; https://doi.org/10.1111/j.1096-3642.2009.00530.x

Enrichment Method: SAGE curated research pass; title and scientific name matched; chronology and lineage distinctions retained; evidence separated from inference

Scientific name: Vancleavea campi

Evidence / representation: comparative_taxon_visual

Why It Is In This SAGE Exhibit

comparative_taxon_visual

Rise of the Dinosaurs: A New World After Catastrophe.

Provenance

Smithsonian Deep Time source scene: Reptiles Move Back to the Ocean in the Jurassic

Visual source institution: Wikimedia Commons

Exhibition History

Included in the SAGE Museum Dinosaurs & Deep Time staging exhibit.

Collection & Credit

Media license: CC BY-SA 4.0

https://creativecommons.org/licenses/by-sa/4.0

Subjects & Themes

Vancleavea campi Late Triassic — Rhaetian for the Smithsonian specimen cast Reptiles Move Back to the Ocean in the Jurassic Rise of the Dinosaurs

ORIGINAL COLLECTION SOURCE

This object page stays inside SAGE Museum. The Smithsonian link below is provided only as the original scholarly collection record. It opens separately.

VIEW ORIGINAL SMITHSONIAN RECORD ↗