Tree presented in paper based on 57 characters derived from Godefroit et al (2008) and Evans and Reisz (2007)

Pereda-Suberbiola, X., Canudo, J.I., Cruzado-Caballero, P., Barco, J.L. López-Martínez, N. Oms, O. & Ruiz-Omenaca (2009) The last hadrosaurid dinosaurs of Europe: A new lambeosaurine from the Uppermost Cretaceous of Aren (Huesca, Spain), C. R. Palevol, 8(6): 559-572 doi:10.1016/j.crpv.2009.05.002

Arenysaurus ardevoli Pereda-Suberbiola et al. 2009

Matrix is derived from Godefroit et al. (2008)*, which the authors regarded as the most complete hadrosaurid phylogeny published... Uh-huh. Would be interesting to see where this taxon falls out in other analyses. It's weird because they cite both PrietoMarquez et al. (2006) and Horner et al (2004), both of which are much larger...

Plenty more information (including figures from the paper and photographs) is available here-
http://aragosaurus.blogspot.com/2009/08/arenysaurus-en-discovery.html
http://aragosaurus.blogspot.com/2009/08/arenysaurus-uno-de-los-ultimos.html
http://aragosaurus.com/galeria/main.php?g2_itemId=467

WeBlog Aragosaurus is a great resource!

other refs cited:
P. Godefroit, S. Hai, T. Yu, P. Lauters, New hadrosaurid dinosaurs
from the Uppermost Cretaceous of north-eastern China, Acta.
Palaeontol. Pol. 53 (2008) 47–74.

D.C. Evans, R.R. Reisz, Anatomy and relationships of Lambeosaurus
magnicristatus, a crested hadrosaurid dinosaur
(Ornithischia) from the Dinosaur Park Formation, Alberta, J.Vert.
Paleontol. 27 (2007) 373–393.

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