Thalattosaur marine reptile — Askeptosaurus italicus

Geologic period: Middle Triassic — late Anisian

Age: Middle Triassic.

Feeding: Predatory marine feeding is inferred from skull and teeth.

Locomotion: Aquatic swimming.

Body plan: Long slender body, elongated neck and tail, with limbs retained for swimming and maneuvering.

Evidence: Skeletons preserve direct anatomical evidence. Bone histology shows unusually compact internal bone structure.

Why it matters: Askeptosaurus represents one of several entirely different reptile lineages that independently invaded Triassic seas.

Plain Language Identity: A long-bodied Middle Triassic thalattosaur adapted for life in marine environments.

What You Are Looking At: A cast based on fossil skeletal material of Askeptosaurus italicus.

Ecosystem: Middle Triassic marine environment of the southern Alpine region.

Preservation: Visitor display is a cast.

Find Location: Southern Alpine region, including material from Italy and Switzerland.

Open Questions: Do not group thalattosaurs with ichthyosaurs, plesiosaurs or mosasaurs simply because all were marine reptiles.

Source Urls: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list; https://pubmed.ncbi.nlm.nih.gov/37601161/; https://pmc.ncbi.nlm.nih.gov/articles/PMC10432342/

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

Scientific name: Askeptosaurus italicus

Evidence / representation: comparative_taxon_visual

comparative_taxon_visual

Rise of the Dinosaurs: A New World After Catastrophe.

Media license: CC BY 4.0

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