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* A study on the composition and structure of bone fragments of ''Deltavjatia vjatkensis'' from the Kotelnich vertebrate fossil site is published by Kiseleva ''et al.'' (2019), who report [[white blood cell]]-like structures, interpreted as possible leukocytes.<ref>{{Cite journal|author1=Daria Kiseleva |author2=Oleg Shilovsky |author3=Evgeny Shagalov |author4=Anastasia Ryanskaya |author5=Maria Chervyakovskaya |author6=Elizaveta Pankrushina |author7=Nadezhda Cherednichenko |year=2019 |title=Composition and structural features of two Permian parareptile (''Deltavjatia vjatkensis'', Kotelnich Site, Russia) bone fragments and their alteration during fossilisation |journal=Palaeogeography, Palaeoclimatology, Palaeoecology |volume=526 |pages=28–42 |doi=10.1016/j.palaeo.2019.04.015 }}</ref>
* A study on the [[Ontogeny|ontogenetic]] changes in long-bone and rib [[histology]] of ''Deltavjatia rossica'' and ''[[Scutosaurus]] karpinskii'' is published by Boitsova ''et al.'' (2019).<ref>{{Cite journal|author1=Elizaveta A. Boitsova |author2=Pavel P. Skutschas |author3=Andrey G. Sennikov |author4=Valeriy K. Golubev |author5=Vladimir V. Masuytin |author6=Olga A. Masuytina |year=2019 |title=Bone histology of two pareiasaurs from Russia (''Deltavjatia rossica'' and ''Scutosaurus karpinskii'') with implications for pareiasaurian palaeobiology |journal=Biological Journal of the Linnean Society |volume=128 |issue=2 |pages=289–310 |doi=10.1093/biolinnean/blz094 }}</ref>
* A study on the microstructure of limb bones, a rib fragment and [[osteoderm]]s of ''[[Provelosaurus]] americanus'' is published online by Farias, Schultz & Soares (2019).<ref>{{cite journal |author1=Brodsky Dantas Macedo Farias |author2=Cesar Leandro Schultz |author3=Marina Bento Soares |year=2019 |title=Bone microstructure of the pareiasaur ''Provelosaurus americanus'' from the Middle Permian of southern Brazil |journal=Historical Biology: An International Journal of Paleobiology |volume=
* A study on the species richness and morphological diversity of [[Parareptilia|parareptiles]] over the course of their evolutionary history is published by MacDougall, Brocklehurst & Fröbisch (2019).<ref>{{Cite journal|author1=Mark J. MacDougall |author2=Neil Brocklehurst |author3=Jörg Fröbisch |year=2019 |title=Species richness and disparity of parareptiles across the end-Permian mass extinction |journal=Proceedings of the Royal Society B: Biological Sciences |volume=286 |issue=1899 |pages=Article ID 20182572 |doi=10.1098/rspb.2018.2572 |pmid=30890099 |pmc=6452079 }}</ref>
* A study testing whether the consistent evolutionary size increase in [[Captorhinidae|captorhinids]] led to major re‐patterning in their [[long bone]] structure is published by Romano & Rubidge (2019).<ref>{{cite journal |author1=Marco Romano |author2=Bruce Rubidge |year=2019 |title=Long bone scaling in Captorhinidae: do limb bones scale according to elastic similarity in sprawling basal amniotes? |journal=Lethaia |volume=52 |issue=3 |pages=389–402 |doi=10.1111/let.12319 }}</ref>
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