Journal
ACTA PALAEONTOLOGICA POLONICA
Volume 60, Issue 1, Pages 145-154Publisher
INST PALEOBIOLOGII PAN
DOI: 10.4202/app.2012.0151
Keywords
Dinosauria; Sauropoda; Eusauropoda; Jurassic; China
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Funding
- University of Alberta
- Alberta Ingenuity Fund
- Vanier CGS
- NSERC
- Taito Corporations
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Many sauropod ghost lineages cross the Middle Jurassic, indicating a time interval that requires increased sampling. A wide taxonomic spectrum of sauropodomorphs is known from the Middle Jurassic of China, but the braincase of a new sauropod, named here Nebulasaurus taito gen. et sp. nov., is distinct. Nebulasaurus is sister taxon to Spinophorosaurus from the Middle Jurassic of Africa and represents a clade of basal eusauropods previously unknown from Asia. The revised faunal list indicates dramatic transitions in sauropodomorph faunas from the Jurassic to Cretaceous of Asia; these are consistent with geographic isolation of Asia through the Late Jurassic. Non-sauropod sauropodomorphs, non-mamenchisaurid eusauropods (including basal macronarians), and mamenchisaurids successively replaced previous grades through the Jurassic, and titanosauriforms excluded all other sauropod lineages across the Jurassic-Cretaceous boundary.
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