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* A study on the bone microstructure of the skeleton of a specimen of ''[[Stenopterygius]] quadriscissus'' from the Lower Jurassic [[Posidonia Shale]] ([[Germany]]) is published by Anderson ''et al.'' (2019).<ref>{{Cite journal|author1=Katherine L. Anderson |author2=Patrick S. Druckenmiller |author3=Gregory M. Erickson |author4=Erin E. Maxwell |year=2019 |title=Skeletal microstructure of ''Stenopterygius quadriscissus'' (Reptilia, Ichthyosauria) from the Posidonienschiefer (Posidonia Shale, Lower Jurassic) of Germany |journal=Palaeontology |volume=62 |issue=3 |pages=433–449 |doi=10.1111/pala.12408 |s2cid=135229818 }}</ref>
* A study on the [[Ontogeny|ontogenetic]] variation in the anatomy of the braincases of members of the genus ''Stenopterygius'' is published by Miedema & Maxwell (2019).<ref>{{cite journal |author1=Feiko Miedema |author2=Erin E. Maxwell |year=2019 |title=Ontogeny of the braincase in ''Stenopterygius'' (Reptilia, Ichthyosauria) from the Lower Jurassic of Germany |journal=Journal of Vertebrate Paleontology |volume=39 |issue=4 |pages=e1675164 |doi=10.1080/02724634.2019.1675164 |s2cid=209439995 |doi-access=free }}</ref>
* Description of new ophthalmosaurid fossils from the Upper Jurassic of the Slottsmøya Member Lagerstätte ([[Spitsbergen]], [[Norway]]) and a study on the phylogenetic relationships of ophthalmosaurid specimens from the Slottsmøya Member Lagerstätte is published by Delsett ''et al.'' (2019).<ref>{{cite journal |author1=Lene L. Delsett |author2=Aubrey J. Roberts |author3=Patrick S. Druckenmiller |author4=Jørn H. Hurum |year=2019 |title=Osteology and phylogeny of Late Jurassic ichthyosaurs from the Slottsmøya Member Lagerstätte (Spitsbergen, Svalbard) |journal=Acta Palaeontologica Polonica |volume=64 |issue=4 |pages=717–743 |doi=10.4202/app.00571.2018 |s2cid=210294877 |doi-access=free |hdl=10852/76089 |hdl-access=free }}</ref>
* A revision of the [[type series]] of all three species of ''[[Undorosaurus]]'' is published by Zverkov & Efimov (2019).<ref>{{cite journal |author1=Nikolay G. Zverkov |author2=Vladimir M. Efimov |year=2019 |title=Revision of ''Undorosaurus'', a mysterious Late Jurassic ichthyosaur of the Boreal Realm |journal=Journal of Systematic Palaeontology |volume=17 |issue=14 |pages=1183–1213 |doi=10.1080/14772019.2018.1515793 |s2cid=91912834 |url=https://figshare.com/articles/Revision_of_i_Undorosaurus_i_a_mysterious_Late_Jurassic_ichthyosaur_of_the_Boreal_Realm/7624868 }}</ref>
* A study on the taxonomy and phylogeny of ichthyosaurs belonging to the genus ''[[Arthropterygius]]'' is published by Zverkov & Prilepskaya (2019).<ref>{{cite journal |author1=Nikolay G. Zverkov |author2=Natalya E. Prilepskaya |year=2019 |title=A prevalence of ''Arthropterygius'' (Ichthyosauria: Ophthalmosauridae) in the Late Jurassic—earliest Cretaceous of the Boreal Realm |journal=PeerJ |volume=7 |pages=e6799 |doi=10.7717/peerj.6799 |pmid=31106052 |pmc=6497043 |doi-access=free }}</ref>
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