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Osseous anomalies of the cryptobranchid Eoscapherpeton asiaticum (Amphibia: Caudata) from the Late Cretaceous of Uzbekistan
Ist Teil von
Mitteilungen aus dem Museum für Naturkunde in Berlin. Fossil record, 2018-04, Vol.21 (1), p.159-169
Ort / Verlag
Sofia: Pensoft Publishers
Erscheinungsjahr
2018
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
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.