[Osteology and phylogeny of Westphaliasaurus simonsensii: a new plesiosaurid (Sauropterygia) from the Lower Jurassic (Pliensbachian) of Sommersell (Hoexter district), North Rhine Westphalia, Germany.] Geologie und Palaeontologie in Westfalen, 79, Maerz 2011: 1-56. 49 [Zoological Record Volume 147]