Camarasaurus

D, Michael D. & Emic, 2012, The early evolution of titanosauriform sauropod dinosaurs, Zoological Journal of the Linnean Society 166 (3), pp. 624-671 : 635

CAMARASAURUS

The genus Camarasaurus is known from dozens of skeletons found across the western USA (Ikejiri, 2005). Four species of Camarasaurus are currently recognized: Camarasaurus grandis , Camarasaurus lewisi , Camarasaurus supremus , and Camarasaurus lentus ( Upchurch et al., 2004) . Perhaps owing to its broad spatial distribution and the presence of four species in the terminal taxon, some characters are polymorphic for Camarasaurus in this analysis. Where polymorphisms were present, the state present in the Gunma specimen ( McIntosh et al., 1996) of Camarasaurus was favoured, because it is found stratigraphically lower (and is several million years older) than most other specimens of Camarasaurus , and so it is more likely to approximate the ancestral condition for the genus (Ikejiri, 2005).