Editing Plesiosaurus (section)

===Limbs===
[[File:Plesiosaurus dolichodeirus.png|thumb|right|[[Life restoration]]]] 
The shoulder girdle is only partly known but appears to be typical for plesiosaurs. It includes fused [[clavicle]]s at the anterior end, [[scapula]]e (shoulder blades), and large [[coracoid]]s. The scapulae and coracoids both contribute to the [[glenoid cavity|glenoids]] (arm sockets). A pair of oval holes called pectoral fenestrae are found midway along the scapular/coracoid contacts.<ref name=Storrs171/> The forelimbs are elongate and relatively narrow compared to those of most plesiosaurs. The [[humerus]] (upper arm bone) has distinctive curvature, which appears to be a retained [[symplesiomorphy|primitive feature]] among [[sauropterygia]]ns. Mature ''Plesiosaurus'' also have a distinctive groove along the ventral surface of the humerus. The forearm includes a flat, broad, crescent-shaped [[ulna]] and a "robust and pillar-like" [[radius (bone)|radius]]. The wrist includes six bones.<ref name=Storrs173>Storrs 1997 pp. 173</ref> The hand paddle has five digits; the [[phalanx bones|phalangeal formula]] is uncertain, but the count for one large individual, from "[[thumb]]" to fifth "finger", is 4-8-9-8-6.<ref name=Storrs176>Storrs 1997 pp. 176</ref>

The pelvis includes equant [[pubis (bone)|pubic bones]], [[ischium|ischia]],<ref name=Storrs176/> and blade-shaped [[ilium (bone)|ilia]] connecting the pelvis to the vertebral column.<ref name=Storrs178>Storrs 1997 pp. 178</ref> The [[acetabulum]] is formed by surfaces on the pubic bones and ischia. Similar to the pectoral girdle, there is a pair of holes between the ischia and pubic bones.<ref name=Storrs176/> The hindlimbs are long and narrow,<ref name=Storrs178/> and in adults, they are much smaller than the forelimbs.<ref name=Storrs176/> The [[femur|thigh bones]] are straight. The lower hindlimb includes two roughly equal-sized bones, the robust [[tibia]] and the semilunate-shaped [[fibula]]. There are six bones in the ankle. The foot paddle includes five digits. Like the hand, the phalangeal formula is uncertain, but is at least 3-7-9-8-7 from innermost to outer "toe".<ref name=Storrs178/>