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* A study on [[hydrodynamics]] of neck length and thickness in plesiosaurs is published by Troelsen ''et al.'' (2019).<ref>{{Cite journal|author1=Pernille V. Troelsen |author2=David M. Wilkinson |author3=Mehdi Seddighi |author4=David R. Allanson |author5=Peter L. Falkingham |year=2019 |title=Functional morphology and hydrodynamics of plesiosaur necks: Does size matter? |journal=Journal of Vertebrate Paleontology |volume=in press |issue= |pages=e1594850 |doi=10.1080/02724634.2019.1594850 }}</ref>
* Pathological fusions of neck vertebrae are reported in four plesiosaur specimens from different geological horizons by Sassoon (2019).<ref>{{cite journal |author=Judyth Sassoon |year=2019 |title=Congenital and late onset vertebral fusions in long necked plesiosaurs: The first report of spondylosis deformans in Sauropterygians |journal=Palaeontologia Electronica |volume=22 |issue=1 |pages=Article number 22.1.1 |doi=10.26879/913 }}</ref>
* Four teeth of a freshwater plesiosaur are described from the [[Middle Jurassic]] [[Xinhe Formation]] ([[Gansu]], [[China]]) by Gao ''et al.'' (2019).<ref>{{cite journal |author1=Ting Gao |author2=Da-Qing Li |author3=Long-Feng Li |author4=Jing-Tao Yang |year=2019 |title=The first record of freshwater plesiosaurian from the Middle Jurassic of Gansu, NW China, with its implications to the local palaeobiogeography |journal=Journal of Palaeogeography |volume=8 |pages=Article number 27 |doi=10.1186/s42501-019-0043-5 }}</ref>
* A review of the fossil record of Late Cretaceous Antarctic plesiosaurs is published by O'Gorman ''et al.'' (2019).<ref>{{cite journal |author1=José Patricio O'Gorman |author2=Rodrigo Otero |author3=Marcelo Reguero |author4=Zulma Gasparini |year=2019 |title=Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |journal=Advances in Polar Science |volume=30 |issue=3 |pages=210–227 |doi=10.13679/j.advps.2018.0049 }}</ref>
* A study on the morphology of the teeth and skull of ''[[Megacephalosaurus]] eulerti'', and on their implications for assessing the phylogenetic relationships of this species, is published by Madzia, Sachs & Lindgren (2019).<ref>{{cite journal |author1=Daniel Madzia |author2=Sven Sachs |author3=Johan Lindgren |year=2019 |title=Morphological and phylogenetic aspects of the dentition of ''Megacephalosaurus eulerti'', a pliosaurid from the Turonian of Kansas, USA, with remarks on the cranial anatomy of the taxon |journal=Geological Magazine |volume=156 |issue=7 |pages=1201–1216 |doi=10.1017/S0016756818000523 }}</ref>
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==Turtles==
===Research===
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