Spinosaurus aegyptiacus specimen FSAC-KK 11888 preserves a deep, flexible tail tested with physical models for aquatic propulsion; the experiment supports a swimming-performance hypothesis, not directly observed behavior or a genus-wide ecology. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range100.5–93.9 Ma
Content packagedinosauria
PBDBtxn:38598
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
morphology · medium
Spinosaurus aegyptiacus specimen FSAC-KK 11888 preserves a deep, flexible tail tested with physical models for aquatic propulsion; the experiment supports a swimming-performance hypothesis, not directly observed behavior or a genus-wide ecology.
claim:taxon:spinosaurusfossil-range · medium
Spinosaurus is displayed at 100.5–93.9 Ma only as the Cenomanian specimen-bearing interval for FSAC-KK 11888, not the complete genus range. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.
claim:taxon:spinosaurus:source-bounded-range-rc49
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
Tail-propelled aquatic locomotion in a theropod dinosaurIbrahim, N.; Maganuco, S.; Dal Sasso, C.; Fabbri, M.; Auditore, M.; Bindellini, G.; Martill, D.M.; Zouhri, S.; Mattarelli, D.A.; Unwin, D.M.; Wiemann, J.; Bonadonna, D.; Amane, A.; Jakubczak, J.; Joger, U.; Lauder, G.V.; Pierce, S.E. · 2020 · DOI 10.1038/s41586-020-2190-3