Ben Creisler
I have not seen the text of this new paper but apparently it does mention dinosaurs:
Paula Cascardo, Elisa Pucu & Daniela Leles (2021)
Review of Parasites Found in Extinct Animals: What Can Be Revealed.
Journal of Parasitology 107(2): 275-283
doi: https://doi.org/10.1645/20-30
https://bioone.org/journals/journal-of-parasitology/volume-107/issue-2/20-30/Review-of-Parasites-Found-in-Extinct-Animals--What-Can/10.1645/20-30.short
Review of Parasites Found in Extinct Animals: What Can Be Revealed.
Journal of Parasitology 107(2): 275-283
doi: https://doi.org/10.1645/20-30
https://bioone.org/journals/journal-of-parasitology/volume-107/issue-2/20-30/Review-of-Parasites-Found-in-Extinct-Animals--What-Can/10.1645/20-30.short
Parasitism is inherent to life and observed in all species. Extinct animals have been studied to understand what they looked like, where and how they lived, what they fed on, and the reasons they became extinct. Paleoparasitology helps to clarify these questions based on the study of the parasites and microorganisms that infected those animals, using as a source material coprolites, fossils in rock, tissue, bone, mummy, and amber, analyses of ancient DNA, immunodiagnosis, and microscopy.
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A couple of older papers:
G Poinar Jr & A J Boucot (2006)
Evidence of intestinal parasites of dinosaurs.
Parasitology 133(pt 2): 245-2499.
doi: 10.1017/S0031182006000138.
https://www.cambridge.org/core/journals/parasitology/article/abs/evidence-of-intestinal-parasites-of-dinosaurs/F97F0EC18673BC3C2D4A8437E15A8B4D
Free pdf here:
https://www.researchgate.net/publication/7156388_Evidence_of_intestinal_parasites_of_dinosaurs
Evidence of intestinal parasites of dinosaurs.
Parasitology 133(pt 2): 245-2499.
doi: 10.1017/S0031182006000138.
https://www.cambridge.org/core/journals/parasitology/article/abs/evidence-of-intestinal-parasites-of-dinosaurs/F97F0EC18673BC3C2D4A8437E15A8B4D
Free pdf here:
https://www.researchgate.net/publication/7156388_Evidence_of_intestinal_parasites_of_dinosaurs
Protozoan cysts and helminth eggs preserved in a coprolite from the Early Cretaceous Bernissart Iguanodon shaft in Belgium demonstrate that representatives of 3 phyla parasitized dinosaurs by that period. These fossil parasite stages are described and their possible effect on dinosaurs discussed. These findings represent the earliest fossil records of protozoan and helminth parasites of terrestrial vertebrates.
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Also:
A locked dinosaur mystery
https://equatorialminnesota.blogspot.com/2016/07/a-locked-dinosaur-mystery.html
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Justin Tweet, Karen Chin and A. A. Ekdale (2016)
Trace fossils of possible parasites inside the gut contents of a hadrosaurid dinosaur, Upper Cretaceous Judith River Formation, Montana.
Journal of Paleontology 90(2): 279 - 287
DOI: https://doi.org/10.1017/jpa.2016.43
https://www.cambridge.org/core/journals/journal-of-paleontology/article/abs/trace-fossils-of-possible-parasites-inside-the-gut-contents-of-a-hadrosaurid-dinosaur-upper-cretaceous-judith-river-formation-montana/394EDF6FD92E910849452D22DE98892A
Tiny sinuous trace fossils have been found within probable gut contents of an exceptionally preserved specimen of a hadrosaurid dinosaur, Brachylophosaurus canadensis, from the Judith River Formation of Montana. Approximately 280 examples of the trace fossils were observed in 19 samples of gut region material. The tubular structures typically are about 0.3 mm across. Many have thin calcareous linings or layers, and some exhibit fine surficial striae. At least two dozen of these trace fossils share walls with adjacent tubular traces, and this association can extend for several millimeters. While the trace fossils share some characteristics with fine rhizoliths, these features are most consistent with tiny burrows, or possibly body impressions, of worms (vermiform organisms) of uncertain biologic affinity. Such trace fossils have not been reported previously, and herein described as Parvitubulites striatus n. gen. n. sp. Either autochthonous (parasites) or allochthonous (scavengers) worms may have created the trace fossils, but taphonomic factors suggest that autochthonous burrowers are more likely. Several lines of evidence, such as constant diameters and matching directional changes, suggest that the paired trace fossils were made by two individuals moving at the same time, which implies sustained intraspecific contact. Parvitubulites striatus provides a rare record of interactions between terrestrial, meiofaunal-sized, soft-bodied invertebrates and a dinosaur carcass. The evidence that the worms may have parasitized a living hadrosaur and subsequently left traces of intraspecific behavior between individual worms adds unique information to our understanding of Mesozoic trophic interactions.