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New specimens of albanerpetontid amphibians from the Upper Cretaceous of Uzbekistan

100%

Skutschas P. P.

Acta Palaeontologica Polonica

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2007

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tom 52

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nr 4

The albanerpetontid fossil record in Asia was limited to five dentaries of unidentified genus from the Upper Cretaceous Khodzhakul (lower Cenomanian) and Bissekty (Turonian) formations, Kyzylkum Desert, Uzbekistan. Here I describe two fragmentary frontals from the Khodzhakul local fauna as the first unequivocal record of the genusAlbanerpeton in Asia.

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Albanerpetontid amphibians from the Upper Cretaceous of Middle Asia

80%

Gardner J. D., Averianov A. O.

Acta Palaeontologica Polonica

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1998

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tom 43

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nr 3

453-476

We review the fossil record of Asian albanerpetontids. The three dentaries previously attributed to the two species of Nukusurus Nessov, 1981 (lower Cenomanian and Coniacian, Uzbekistan) are from albanerpetontids, but none are distinctive below the familial level. We thus designate the names Nukusurus, N. insuetus Nessov, 1981, and N. sodalis Nessov, 1997 as nomina dubia within the Albanerpetontidae. Two dentaries (lower Cenomanian, Uzbekistan) described herein for the first time supplement the known record of Asian albanerpetontids. The holotype atlas and only specimen of the supposed albanerpetontid Bishara backa Nessov, 1997 (upper Santonian-?Campanian, Kazakhstan) is shown to be from a salamander, not an albanerpetontid. Our study recognizes Albanerpeton (Cretaceous-Miocene, North America and Europe) and Celtedens (Middle Jurassic-Lower Cretaceous, Europe) as the only valid albanerpetontid genera. Limited evidence favors one or more dispersals from Europe or Norttr America to Asia in the medial Cretaceous as the major biogeographic event in the history of Asian albanerpetontids.

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Revised taxonomy of albanerpetontid amphibians

80%

Gardner J. D.

Acta Palaeontologica Polonica

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2000

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tom 45

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nr 1

55-70

Characters of the jaws and frontals are often used to differentiate albanerpetontid genera and species, yet the reliability of these characters has rarely been examined. Frontals are diagnostic for the genera Albanerpeton and Celtedens and for species in the latter genus. The value of frontals at the specific level in Celtedens may be inflated by lack of information about variation in jaw structure. Characters of the frontals, jaws, and body size differentiate species of Albanerpeton. Differential diagnoses are presented for the Albanerpetontidae based on cranial and vertebral characters and for the two named genera based on frontal characters. Each genus is characterized by one autapomorphy: fused frontals triangular in Albanerpeton and internasal process bulbous in Celtedens. An enigmatic albanerpetontid from the Middle Jurassic (upper Bathonian) of England has a unique mixture of frontal and premaxillary character states that precludes it from being included in either Celtedens or Albanerpeton.This leaves the oldest occurrences of the two genera in, respectively, the Late Jurassic (Kimmeridgian) and Early Cretaceous (latest Aptian/earliest Albian).

Ograniczanie wyników

3 Acta Palaeontologica Polonica

2 Gardner J. D.

1 Averianov A. O.

1 Skutschas P. P.

1 2007

1 2000

1 1998

New specimens of albanerpetontid amphibians from the Upper Cretaceous of Uzbekistan

Albanerpetontid amphibians from the Upper Cretaceous of Middle Asia

Revised taxonomy of albanerpetontid amphibians