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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde

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Foss. Rec., 21, 159-169, 2018
https://doi.org/10.5194/fr-21-159-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Apr 2018
Osseous anomalies of the cryptobranchid Eoscapherpeton asiaticum (Amphibia: Caudata) from the Late Cretaceous of Uzbekistan
Pavel Skutschas, Veniamin Kolchanov, Elizaveta Boitsova, and Ivan Kuzmin Faculty of Biology, Department of Vertebrate Zoology, Saint Petersburg State University, Universitetskaya nab. 7/9, 199034 Saint Petersburg, Russia
Abstract. Osseous anomalies/pathologies in the Late Cretaceous cryptobranchid salamander Eoscapherpeton asiaticum from the Turonian Bissekty Formation of Uzbekistan are analyzed using gross morphological description, microCT, and histologic analysis. These pathologies result from trauma (fractured and subsequently healed dentary and femora; hematoma on femur), possible infection due to trauma (prearticular with exostosis and necrotic cavities; anterior trunk vertebra and fused vertebra with pathological enlargements formed during reactive periosteal growth) and congenital disorders (hemivertebra and fused vertebrae with shortened asymmetrical centra and abnormal arrangements of transverse processes). The origin of the pathologies of two atlantal specimens (enlargement of transverse processes) is unclear. Our report of hemivertebra in Eoscapherpeton is the first occurrence of this congenital pathology in a fossil lissamphibian. The occurrence of several traumatic femoral pathologies in Eoscapherpeton could be a result of intraspecific aggressive behavior. Bone pathologies are described for the first time in fossil salamanders.
Citation: Skutschas, P., Kolchanov, V., Boitsova, E., and Kuzmin, I.: Osseous anomalies of the cryptobranchid Eoscapherpeton asiaticum (Amphibia: Caudata) from the Late Cretaceous of Uzbekistan, Foss. Rec., 21, 159-169, https://doi.org/10.5194/fr-21-159-2018, 2018.
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Short summary
Paleopathologies among fossil members of modern groups of amphibians are poorly documented. We describe pathologies of the fossil salamander Eoscapherpeton asiaticum from the Late Cretaceous of Uzbekistan. These pathologies can result from trauma, infection from trauma and congenital disorders. The occurrence of several traumatic femoral pathologies in Eoscapherpeton could result from intraspecific aggressive behavior. Bone pathologies are described for the first time in fossil salamanders.
Paleopathologies among fossil members of modern groups of amphibians are poorly documented. We...
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