Fig. 1. Two of the three different morphotypes used in Plesiosauria in this analysis, demonstrating the different regions used in skeletal completeness metrics. A. Cryptoclidus, a "plesiosauromorph". B. Liopleurodon, a "pliosauromorph". Skeletal regions: i, skull and mandible; ii, cervical vertebrae and ribs; iii, dorsal and sacral vertebrae and ribs; iv, pectoral girdle; v, fore limbs; vi, pelvic girdle; vii, hind limbs; viii, caudal vertebrae and ribs. Outlines modified from O'Keefe (2002). Not to scale.

Published as part of Tutin, Samuel L. & Butler, Richard J., 2017, The completeness of the fossil record of plesiosaurs, marine reptiles from the Mesozoic, pp. 563-573 in Acta Palaeontologica Polonica 62 (3) on page 565, DOI: 10.4202/app.00355.2017, http://zenodo.org/record/13263219