Stem placental mammal petrosal bone from Late Cretaceous of Uzbekistan (free pdf)
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Ben Creisler
Dec 23, 2025, 1:53:02 PM12/23/25
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Ben Creisler
A new paper:
A.O. Averianov and M.V. Sinitsa (2025)
Petrosal bone of a stem placental mammal from the Late Cretaceous (Cenomanian) of Uzbekistan
Proceedings of the Zoological Institute RAS 329(4): 409–420
doi: https://doi.org/10.31610/trudyzin/2025.329.4.409
https://www.zin.ru/journals/trudyzin/eng/publication.html?id=613
Free pdf:
https://www.zin.ru/journals/trudyzin/doc/vol_329_4/TZ_329_4_Averianov2.pdf
The isolated petrosal bone from the early Late Cretaceous (early Cenomanian) Khodzhakul Formation at the Sheikhdzheili locality in western Uzbekistan is similar to the petrosal of the Early Cretaceous eutherian Prokennalestes in that they both have a transpromontorial course of the internal carotid artery, a prootic canal, a lateral flange, and a large stapedius fossa. Both also lack a deep cochlear fossula. However, it differs from the petrosal of Prokennalestes in the lateral flange unreduced lateral to the promontorium, the fenestra vestibuli being more elliptical, with a stapedial ratio of 2.38; the cochlea being more tightly coiled (487° or 1.35 turns); the position of hiatus Fallopii within the petrosal; cavum supracochleare open dorsally; and the crista interfenestralis showing a curved posterior extension similar to that of Zalambdalestidae. The petrosal bone from the Sheikhdzheili locality is similar to that in an asioryctitherian Uchkudukodon from the younger (late Turonian) Bissekty Formation in Uzbekistan, as evidenced by the pattern of grooves for the stapedial and internal carotid arteries on the promontorium, as well as the presence of an unreduced lateral flange. It may belong to an asioryctitherian, a group currently unknown from the Sheikhdzheili locality based on dental remains.
Free pdf:
A.O. Averianov and M.V. Sinitsa (2025)
Petrosal bone of a stem placental mammal from the Late Cretaceous (Cenomanian) of Uzbekistan
Proceedings of the Zoological Institute RAS 329(4): 409–420
doi: https://doi.org/10.31610/trudyzin/2025.329.4.409
https://www.zin.ru/journals/trudyzin/eng/publication.html?id=613
Free pdf:
https://www.zin.ru/journals/trudyzin/doc/vol_329_4/TZ_329_4_Averianov2.pdf
The isolated petrosal bone from the early Late Cretaceous (early Cenomanian) Khodzhakul Formation at the Sheikhdzheili locality in western Uzbekistan is similar to the petrosal of the Early Cretaceous eutherian Prokennalestes in that they both have a transpromontorial course of the internal carotid artery, a prootic canal, a lateral flange, and a large stapedius fossa. Both also lack a deep cochlear fossula. However, it differs from the petrosal of Prokennalestes in the lateral flange unreduced lateral to the promontorium, the fenestra vestibuli being more elliptical, with a stapedial ratio of 2.38; the cochlea being more tightly coiled (487° or 1.35 turns); the position of hiatus Fallopii within the petrosal; cavum supracochleare open dorsally; and the crista interfenestralis showing a curved posterior extension similar to that of Zalambdalestidae. The petrosal bone from the Sheikhdzheili locality is similar to that in an asioryctitherian Uchkudukodon from the younger (late Turonian) Bissekty Formation in Uzbekistan, as evidenced by the pattern of grooves for the stapedial and internal carotid arteries on the promontorium, as well as the presence of an unreduced lateral flange. It may belong to an asioryctitherian, a group currently unknown from the Sheikhdzheili locality based on dental remains.
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