Phylogeny, Histology and Inferred Body Size Evolution in a New Rhabdodontid Dinosaur from the Late Cretaceous of Hungary

作者: Attila Ősi , Edina Prondvai , Richard Butler , David B. Weishampel

DOI: 10.1371/JOURNAL.PONE.0044318

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摘要: Rhabdodontid ornithopod dinosaurs are characteristic elements of Late Cretaceous European vertebrate faunas and were previously collected from lower Campanian to Maastrichtian continental deposits. Phylogenetic analyses have placed rhabdodontids among basal ornithopods as the sister taxon clade consisting Tenontosaurus, Dryosaurus, Camptosaurus, Iguanodon. Recent studies considered Zalmoxes, best known representative clade, be significantly smaller than closely related such or Rhabdodon, concluded that it was probably an island dwarf inhabited Haţeg Island. remains Santonian western Hungary provide evidence for a new, small-bodied form, which we assign Mochlodon vorosi n. sp. The new species is most similar early M. suessi Austria, close affinities two further supported by results global phylogenetic analysis ornithischian dinosaurs. Bone histological representatives all indicate adult body length 1.6-1.8 m in Hungarian Austrian species, 2.4-2.5 subadults both Zalmoxes robustus Z. shqiperorum much larger, 5-6 Rhabdodon. mapping femoral lengths onto suggests around 340 mm ancestral state Rhabdodontidae, (320-333 mm). Our size evolution does not support hypothesis autapomorhic nanism Zalmoxes. However, Rhabdodon reconstructed having undergone autapomorphic giantism small (245 mm) consistent with reduction relative rhabdodontid condition. imply pre-Santonian divergence between eastern lineages within Tethyan archipelago.

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