Plesiosaurioids in which there are 42 cervical vertebrae with amphicoelous centra, the length of which never exceeds the height; the ventral ramus of the scapula is relatively large and plate-like, and has a convex anterior margin; the coracoids meet in the midline in adults; the width across the posterior cornua of the coracoids slighly exceeds the interglenoid width in adults; the humerus and to a lesser extent the femur are expanded posterodistally, both forming three distinct articular facets; there are three epipodials in both manus and pes; the overall length of the adult is 5.0 to 6.6m. The skull and dermal elements of the pectoral girdle are unknown in this species.