Final answer:
The new sauropod species named Suuwassea is unusual due to its elongated neck, unique hip bone arrangement, and specialized teeth.
Step-by-step explanation:
The new sauropod species named Suuwassea, discovered by Peter Dodson and Jerry Harris, is considered unusual due to several distinctive characteristics. Firstly, Suuwassea had an unusually elongated neck, even compared to other long-necked sauropods. Additionally, it had a unique arrangement of bones in its hip region, with the hip bones placed more vertically than horizontally. Lastly, Suuwassea had specialized teeth that were adapted for feeding on tough vegetation, suggesting a specialized diet.