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* Description of microbodies extracted from a bone of ''Nothosaurus'' from the [[Middle Triassic]] of [[Poland]], reported as morphologically consistent with bone cells of present-day vertebrates, will be published by Surmik ''et al.'' (2019).<ref>{{Cite journal|author1=D. Surmik |author2=M. Dulski |author3=B. Kremer |author4=J. Szade |author5=R. Pawlicki |year=2019 |title=Iron-mediated deep-time preservation of osteocytes in a Middle Triassic reptile bone |journal=Historical Biology: An International Journal of Paleobiology |volume=in press |issue= |pages= 1–8|doi=10.1080/08912963.2019.1599884 }}</ref>
* An articulated juvenile specimen of ''[[Yunguisaurus]] liae'', providing new information on the anatomy of this species, is described from the [[Ladinian]] [[Falang Formation]] ([[China]]) by Wang ''et al.'' (2019).<ref>{{cite journal |author1=Xue Wang |author2=Hao Lu |author3=Da-Yong Jiang |author4=Min Zhou |author5=Zuo-Yu Sun |year=2019 |title=A new specimen of ''Yunguisaurus'' (Reptilia; Sauropterygia) from the Ladinian (Middle Triassic) Zhuganpo Member, Falang Formation, Guizhou, China and the restudy of ''Dingxiaosaurus'' |journal=Palaeoworld |volume=28 |issue= |pages= |doi=10.1016/j.palwor.2019.05.006 }}</ref>
* 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=
* 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>
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* Skull and neck bones of an [[Elasmosauridae|elasmosaurid]] plesiosaur are described from the [[Cenomanian]] [[Hegushi Formation]] ([[Japan]]) by Utsunomiya (2019), representing the oldest confirmed elasmosaurid in Japan and in East Asia.<ref>{{cite journal |author=Satoshi Utsunomiya |year=2019 |title=Oldest Elasmosauridae（Plesiosauria) in East Asia from the Upper Cretaceous Goshoura Group, Shishijima Island, southwestern Japan |journal=Bulletin of the Osaka Museum of Natural History |volume=73 |pages=23–35 |doi=10.20643/00001333 }}</ref>
* A postcranial skeleton of an elasmosaurid belonging or related to the genus ''[[Aristonectes]]'' is described from the uppermost [[Maastrichtian]] levels of the [[Lopez de Bertodano Formation]] ([[Seymour Island]], [[Antarctica]]) by O'Gorman ''et al.'' (2019), who report that this specimen is one of the largest known elasmosaurid specimens worldwide.<ref>{{Cite journal|author1=J.P. O'Gorman |author2=S. Santillana |author3=R. Otero |author4=M. Reguero |year=2019 |title=A giant elasmosaurid (Sauropterygia; Plesiosauria) from Antarctica: new information on elasmosaurid body size diversity and aristonectine evolutionary scenarios |journal=Cretaceous Research |volume=102 |pages=37–58 |doi=10.1016/j.cretres.2019.05.004 }}</ref>
* Digital [[endocast]]s of two specimens of ''[[Libonectes]] morgani'' and a [[Polycotylidae|polycotylid]] from the [[Turonian]] of Goulmima ([[Morocco]]) are reconstructed by Allemand ''et al.'' (2019).<ref>{{Cite journal|author1=Rémi Allemand |author2=Alexandra Houssaye |author3=Nathalie Bardet |author4=Peggy Vincent |year=2019 |title=Endocranial anatomy of plesiosaurians (Reptilia, Plesiosauria) from the Late Cretaceous (Turonian) of Goulmima (Southern Morocco) |journal=Journal of Vertebrate Paleontology |volume=
===New taxa===
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''[[Nothosaurus|Nothosaurus cristatus]]''<ref>{{Cite journal|author1=Juliane K. Hinz |author2=Andreas T. Matzke |author3=Hans-Ulrich Pfretzschner |year=2019 |title=A new nothosaur (Sauropterygia) from the Ladinian of Vellberg-Eschenau, southern Germany |journal=Journal of Vertebrate Paleontology |volume=
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Hinz, Matzke & Pfretzschner
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