Full Breakdown
Antarctic Titanosaur Vertebra Redefines the Continent’s Dinosaur Record
7/2/2026, 4:04:01 AM
Rediscovering a Lost Bone
In December 1985 Michael Thomson and Reinhard Förster collected a large vertebra (BAS D.8621.25) from the Santa Marta Formation on James Ross Island. It was filed as a “large reptile” and stored in the British Antarctic Survey archives. In 2022 Mark Evans recognized its dinosaurian features, confirming it as a titanosaur tail vertebra—the first dinosaur bone and second sauropod fossil from Antarctica.
Background & Context
James Ross Island lies off the southeast Antarctic Peninsula. The Santa Marta Formation records marine sediments of the late Campanian (?82–83 Ma), when the region supported temperate forests under a greenhouse climate.
Data & Statistics
The bone dates to the lower Campanian (?82 ± 0.5 Ma). Size estimates give a total length of 6–7 m (?23 ft). It is a lithostrotian titanosaur within Eutitanosauria indet., the first dinosaur bone and second sauropod fossil from Antarctica.
Why It Matters
The find proves titanosaurs inhabited Antarctica in the Late Cretaceous, supporting models of a warm, forested polar environment and suggesting the continent served as a dispersal corridor linking South America, New Zealand and possibly Australia. It also highlights the scientific payoff of revisiting museum collections with modern imaging.
Official Statements & Responses
BAS called the specimen “exceptionally rare” and noted its importance for Antarctic paleo-biogeography. The Natural History Museum said the bone “provides rare evidence that long-necked sauropods once lived in Antarctica.” Carnegie Museum co-author Lamanna called the discovery “a powerful reminder of why museums collect and steward objects.” UCL researcher Beeston emphasized that CT scanning revealed internal bone structure unavailable from the exterior.
Criticism & Limitations
Scientists note the vertebra’s fragmentary condition prevents species-level identification, and its ontogenetic stage (juvenile versus dwarf adult) cannot be resolved, leaving size and ecological interpretations provisional.
Conflicting Reports & Gaps
Age estimates range from ?80 Ma to 83 Ma. The paper’s publication year appears as 2025 in some outlets and 2026 in others. Taxonomic placement varies, with some authors noting similarity to *Muyelensaurus pecheni* while others refrain from assigning a species.
Verbatim Quotes
- “When I first spotted this bone in our collections a few years ago, I suspected it was a dinosaur,” — Mark Evans, Paleontologist, BAS
- “To date no titanosaurs have been found in Australia, and there is only limited evidence of them in New Zealand,” — Paul Barrett, Paleobiologist, Natural History Museum
- “This bone sat in a collection drawer for decades until new research revealed it for what it was: rare evidence that long-necked sauropod dinosaurs once lived in Antarctica,” — Matthew Lamanna, Paleontologist, Carnegie Museum
- “If he were still with us, he would be delighted to know what this was,” — Mark Evans, Study co-author, BAS
What’s Next
Planned fieldwork on James Ross Island and expanded CT scanning aim to locate additional sauropod material and refine Antarctica’s Cretaceous dinosaur biogeography.
