Journal
JOURNAL OF THE GEOLOGICAL SOCIETY
Volume 164, Issue -, Pages 61-65Publisher
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/0016-76492006-019
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Re-examination of the sauropod dinosaur Cetiosauriscus greppini von Fluene 1922 (Reuchenette Formation; Kimmeridgian, Late Jurassic) from northwestern Switzerland has revealed a well-preserved cartilage capsule at the distal extremity of the right humerus. The capsule represents hyaline cartilage together with fibrocartilage and can be distinguished by colour, surface structure and histology from the periosteum of the bone. This is the first fossil evidence for articular cartilage in a sauropodomorph dinosaur. It indicates the presence of a large articular capsule on sauropod forelimbs, which was only hypothesized until now, and shows that the forelimb length of sauropods was larger than previously assumed.
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