Zelenkov & Arkhangelsky (2023) describe new fossil material of Campanian hesperornithids from the Karyakino locality ( Saratov Oblast, Russia), including the first femur of Hesperornis rossicus. [252] A study on the growth patterns of Macrospondylus bollensis is published by Johnson, Amson & Maxwell (2023). [22] This happy rainbow 2023 calendar features unique rainbows in different colors, patterns, and styles. Joubarne, Therrien & Zelenitsky (2023) describe extensive skin impressions in three hadrosaurid specimens from the Campanian Dinosaur Park Formation ( Alberta, Canada), with two specimens preserving integument of the manus showing that their digits II–III–IV were approximately equal in length and united in a common fleshy structure, and the third specimen preserving scale stripes on its torso which might have corresponded to color stripes in life. [197] Evidence of preservation of elements associated with bone remodeling and redeposition (sulfur, calcium, zinc) in a specimen of Tyrannosaurus rex, interpreted as indicative of preservation of original endogenous chemistry in the studied specimen, is presented by Anné et al. (2023). [126]

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A study on the stable oxygen and carbon isotope compositions of dinosaur eggshell calcites and tooth apatites from the Upper Cretaceous Kakanaut Formation ( Chukotka Autonomous Okrug, Russia) is published by Amiot et al. (2023), who interpret their findings as indicating that near-polar Kakanaut dinosaurs likely laid eggs in early spring, giving time for the hatchlings to grow before winter. [84] A member of the family Ctenochasmatidae belonging to the subfamily Gnathosaurinae. The type species is L. almadrava. A review of the Early Cretaceous dinosaur fauna from Thailand is published by Samathi et al. (2023). [80] A study on palatal grooves of thalattosuchians is published by Young et al. (2023), who report that the studied grooves were continuous with ossified canals that connected the oral cavity to the nasal cavity, and interpret the studied grooves and canals as likely evidence of the existence of a heat exchange pathway linking the palatal vascular plexus to the vessels that supplied blood to the brain and eyes. [21]This 2023 dinosaur calendar is perfect for any child and makes a great calendar for helping a child learn the days of the month and how a calendar works. A study on the anatomy of the holotype specimen of Gravitholus albertae is published by Dyer, Powers & Currie (2023), who interpret both Gravitholus albertae and Hanssuesia sternbergi as likely junior synonyms of Stegoceras validum. [201] Taphonomic effects of fossilization on melanin in feathers are experimentally investigated by Roy et al. (2023). [323]

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A study on the diversification of pterosaurs during their evolutionary history, aiming to determine the factors that affected pterosaur evolution, is published by Yu, Zhang & Xu (2023). [289] Redescription of the anatomy of the skull of Shuvosaurus inexpectatus is published by Lehane (2023). [15] This little botanical 2023 calendar is pretty and delicate with subtle colors and decorative botanical drawings. It’s such a gorgeous option for any home and also looks amazing in a planner too.A study on the cranial biomechanics of Panoplosaurus mirus and Euoplocephalus tutus is published by Ballell, Mai & Benton (2023), who find evidence of differences interpreted as indicative of relatively higher bite forces in Panoplosaurus, as well as indicative of stronger reinforcement of the skull of Euoplocephalus, consistent with highly defensive function. [189] A study on the formation and function of the enlarged unguals of alvarezsauroid and therizinosaur theropods is published by Qin et al. (2023), who interpret their findings as indicative of the evolution of digging adaptions in late-diverging alvarezsauroids, find the unguals of early-branching therizinosaurs to perform well in piercing and pulling, and interpret the enlarged unguals of Therizinosaurus as not adapted to functions that required considerable stress-bearing. [127]

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A study on the evolution of the morphological characters of the pelvic girdle, femur, tibia and fibula in early theropods, especially in megalosauroids, is published by Lacerda, Bittencourt & Hutchinson (2023). [105] Dhiman et al. (2023) report the discovery of 92 titanosaur egg clutches from the Upper Cretaceous Lameta Formation ( Madhya Pradesh, India), including three types of clutches and assigned to six oospecies, interpret their findings as suggestive of higher diversity of titanosaur taxa from the Lameta Formation than indicated by body fossils, and evaluate the implications of the studied egg clutches for the knowledge of the reproductive biology of titanosaurs. [171] Young, M. T.; Bowman, C. I. W.; Erb, A.; Schwab, J. A.; Witmer, L. M.; Herrera, Y.; Brusatte, S. L. (2023). "Evidence for a novel cranial thermoregulatory pathway in thalattosuchian crocodylomorphs". PeerJ. 11. e15353. doi: 10.7717/peerj.15353. PMC 10162039. PMID 37151298. Haldar, A.; Ray, S.; Bandyopadhyay, S. (2023). "A new typothoracine aetosaur (Archosauria, Pseudosuchia) from the Upper Triassic of India with insights on biostratigraphy, diversification, and paleobiogeography". Journal of Vertebrate Paleontology. e2253292. doi: 10.1080/02724634.2023.2253292. Czepiński (2023) describes a specimen of Shri devi with a partial skull from the Upper Cretaceous Barun Goyot Formation ( Mongolia), and reports that the anatomy of the skull confirms close affinities of Shri with Velociraptor mongoliensis, but also that the skull has anatomical features suggesting convergence to the North American eudromaeosaurians. [145]

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Yang et al. (2023) report the first discovery of fossil materials of a large-bodied dromaeosaurid (probably a eudromaeosaur) from the Upper Cretaceous Quantou Formation (Jilin, China). [141] Description of new fossil material of itasuchid crocodyliforms from the Upper Cretaceous Bauru Group ( Brazil) is published by Pinheiro et al. (2023), who also confirm the monophyly of Itasuchidae with some variation in its content, and find the South American itasuchid species to occupy a crocodyliform morphospace, possibly indicating distinct niche occupations. [31] A study on the nasal structures of Velociraptor mongoliensis, indicating that this theropod was unlikely to have a fully developed nasal thermoregulation apparatus for its brain as seen in modern birds, is published by Tada et al. (2023). [146] A study on the microanatomy of the long bones of Nigersaurus taqueti is published by Lefebvre, Allain & Houssaye (2023), who interpret their findings as indicating that microanatomical structure in sauropod limb bones was not subject to drastic selective pressures imposed by heavy weight-bearing. [163] Theropod scrapes from the Cretaceous of Colorado, originally interpreted as evidence of display arenas or leks of theropods, [99] are argued to be more likely results of failed attempts by theropods to dig near-circular bowls that were to be used as nests by Moklestad & Lucas (2023). [100]