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Cretaceous GekkonomorphFossil, AMNH 21444
Dr. Jack Conrad - American Museum of Natural History
Dr. Mark Norell, American Museum of Natural History
Cretaceous Gekkonomorph
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skull
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American Museum of Natural History (AMNH 21444)

Image processing: Dr. Jessie Maisano
Publication Date: 24 Jan 2007

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The imagery on this page is the basis for a paper entitled High-resolution X-ray computed tomography of an Early Cretaceous gekkonomorph (Squamata) from Öösh (Övörkhangai; Mongolia), by J. L. Conrad and M. A. Norell, 2006 (Historical Biology 18:405-431). The abstract is as follows:

       We describe the braincase of AMNH FR 21444, a gecko-like squamate from the Early Cretaceous of        Mongolia, based on high-resolution x-ray computed tomography scans (CT scans) and incorporate it in        a phylogenetic analysis of 36 squamate taxa scored for 226 morphological characters. Our analysis        corroborates the Eublepharidae-Gekkonoidea split as the basal gekkotan dichotomy, but retrieves        Teratoscincus as the sister-taxon to pygopodines + diplodactylines. The combination of plesiomorphic        and apomorphic character states within AMNH FR 21444 demonstrates a decoupled evolutionary        history between the braincase and the rest of the skull and mandible within gekkonomorph        squamates. Enclosure of the lateral head vein and mandibular branch of the trigeminal nerve are both        plesiomorphic for gekkonomorphs. The mechanisms responsible for the transition from the        plesiomorphic skull roof of basal gekkonomorphs to the modern gekkotan condition cannot be        anticipated given the current data.

Click here for a Winzipped 8-bit TIFF version of the original CT dataset (267 mb).

About the Species

This specimen was collected from Red Mesa, Öösh Basin, Mongolian People’s Republic. It was made available to The University of Texas High-Resolution X-ray CT Facility for scanning by Dr. Jack Conrad of the American Museum of Natural History. Funding for scanning and image processing was provided by a National Science Foundation Dissertation Improvement grant (DEB-0408064) to Dr. Conrad. Funding for additional image processing was provided by a National Science Foundation Digital Libraries Initiative grant to Dr. Timothy Rowe of The University of Texas at Austin.

Dorsal view of specimen

Ventral view of specimen

About this Specimen

The specimen was scanned by Matthew Colbert on 1 December 2004 along the coronal axis for a total of 645 1024x1024 pixel slices. Each slice is 0.027 mm thick, with an interslice spacing of 0.027 mm and a field of reconstruction of 12.5 mm.

About the
Scan

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Literature
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Gobi gecko
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To cite this page: Dr. Jack Conrad, Dr. Mark Norell, American Museum of Natural History, 2007, "Cretaceous Gekkonomorph" (On-line), Digital Morphology. Accessed October 25, 2014 at http://digimorph.org/specimens/AMNH_21444/.

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