An aberrant island-dwelling theropod dinosaur from the Late Cretaceous of Romania.
Islands are noted for the occurrence of aberrant, endemic, and dwarfed taxa (the "island effect"). Late Cretaceous vertebrate assemblages of Romania and elsewhere in Europe are classic examples of island faunas in the fossil record, and are characterized by dwarfed herbivorous dinosaurs and other endemic taxa that are noticeably primitive relative to their mainland contemporaries. Fossils of the predators inhabiting the European paleoislands, however, are exceptionally rare and fragmentary. We describe a new dromaeosaurid theropod, based on an articulated skeleton from the Maastrichtian of Romania, which represents the most complete predatory dinosaur from the middle to Late Cretaceous of Europe. This taxon is characterized by a peculiar body plan, most notably extensive fusion in the hand and distal hindlimb, a highly retroverted pelvis with enlarged femoral muscle attachments, and a pair of hyperextensive pedal claws. However, unlike the island-dwelling herbivorous dinosaurs, its closest relatives are contemporary similar-sized Laurasian taxa, indicating faunal connections between Asia and the European islands late into the Cretaceous. This theropod provides support for the aberrant nature of the Late Cretaceous European island-dwelling dinosaurs, but indicates that predators on these islands were not necessarily small, geographically endemic, or primitive.
Csiki
Zoltán
Z
Laboratory of Paleontology, Department of Geology and Geophysics, University of Bucharest, 1 N. Bălcescu Boulevard, Bucharest 010041, Romania. zoltan.csiki@g.unibuc.ro
Vremir
Mátyás
M
Brusatte
Stephen L
SL
Norell
Mark A
MA
D025041:Animal Migration; D000818:Animals; D001208:Asia; D005075:Biological Evolution; D001842:Bone and Bones / Q000033:anatomy & histology*; D025061:Dinosaurs / Q000033:anatomy & histology* / Q000145:classification* / Q000235:genetics; D005060:Europe; D005580:Fossils; D005843:Geography; D006614:Hindlimb / Q000033:anatomy & histology; D010802:Phylogeny; D012383:Romania; D013131:Spine / Q000033:anatomy & histology
Science. 1998 Mar 20;279(5358):1915-9
9506938
Proc Biol Sci. 2008 Jan 22;275(1631):141-8
17986433
Brain Behav Evol. 2004;63(3):125-40
14726622
Science. 2007 Sep 7;317(5843):1378-81
17823350
Nature. 2005 Oct 13;437(7061):1007-11
16222297
Biol Lett. 2006 Mar 22;2(1):110-2
17148340
Science. 2010 Jan 29;327(5965):571-4
20110503
Proc Natl Acad Sci U S A. 2010 May 18;107(20):9258-63
20435913
Am Nat. 2004 Mar;163(3):469-79
15026981
PLoS Biol. 2006 Oct;4(10):e321
16968136
Proc Natl Acad Sci U S A. 2009 Mar 31;106(13):5002-7
19289829
Proc Biol Sci. 2009 Mar 22;276(1659):1101-7
19129109
Nature. 2010 May 27;465(7297):466-8
20505726