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Diplometopon zarudnyi, Zarudnyi's Worm Lizard
Dr. Jessie Maisano - The University of Texas at Austin
Dr. Maureen Kearney, Dr. Timothy Rowe
Diplometopon zarudnyi
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skull
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Field Museum of Natural History (FMNH 64429)

Image processing: Dr. Jessie Maisano
Publication Date: 22 Nov 2005

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The imagery on this page was the basis for a paper entitled Cranial anatomy of the spade-headed amphisbaenian Diplometopon zarudnyi (Squamata, Amphisbaenia) based on high-resolution X-ray computed tomography, by J. A. Maisano, M. Kearney and T. Rowe (Journal of Morphology 267:70-102, 2006). The abstract is as follows:

       The skull of the trogonophid amphisbaenian Diplometopon zarudnyi is described from high-resolution         X-ray computed tomographic (HRXCT) imagery of a whole museum specimen preserved in ETOH. The         skull was digitally resliced and disarticulated into individual elements (see Additional Imagery),        producing novel visualizations that allow detailed morphological analysis of its three-dimensionally        complex structure. The prefrontal and jugal are absent in Diplometopon. The septomaxilla is present        but hidden entirely from superficial view. In contrast to previous studies, we recognize a splenial        fused to the compound bone of the mandible and a squamosal fused to the otic-occipital complex.        Comparison of Diplometopon to the two other amphisbaenians previously described in comparable        detail, Rhineura hatcherii and Amphisbaena alba, reveals a mosaic of cranial similarities and        differences. Both Diplometopon and Rhineura exhibit a craniofacial angulation and expanded rostral        blade related to use of the head as a digging tool, but the detailed architecture of these features is        quite different. Additionally, whereas the snout of Rhineura exhibits a high degree of sculpturing and        sensory innervation, this is not the case in Diplometopon. Unlike in Rhineura and Amphisbaena, the        cranial elements of Diplometopon do not exhibit an extensive degree of overlap or complex        interlocking sutures; instead, most of the cranial elements lie in loose apposition to each other. The        degree to which this mosaic of features reflects functional demands, shared ancestry, and/or        convergence is unclear in the absence of a stable hypothesis of amphisbaenian phylogeny.


DigiMorph Account of Diplometopon

Additional images of Diplometopon zarudnyi were sent to DigiMorph by Danny Fidler of the United States Air Force. The photos were taken May 28, 2004 around 11 pm in the vicinity of Umm Qasr in southern Iraq. Staff Sargent Fiddler described the behavior as follows:

    "Last night I found two worm lizards while I was doing my rounds. I believe they were mating as you can see by the pictures. However I am not sure. ... When the larger of the two was done doing whatever it was it was doing, it released the smaller one. However they were facing each other 'head-to-toe' in the photos. Instead of them grasping each other by what I thought was there genitalia, the larger ones jaw was grasping the bottom portion of the smaller one. And on a few photos, you can see where the last few centimeters of the smaller lizard appeared to be sunken in a bit along the spine, almost like the larger one was sucking fluids from it."

About the Species

This specimen was collected from Qatif Oasis, Saudi Arabia by E. Murray in 1948. It was made available to the University of Texas High-Resolution X-ray CT Facility for scanning by Dr. Jessie Maisano of The University of Texas and Dr. Maureen Kearney of the Field Museum of Natural History. Funding for scanning was provided by a National Science Foundation Digital Libraries Initiative grant to Dr. Timothy Rowe of The University of Texas at Austin. Funding was also provided by a National Science Foundation Assembling the Tree of Life grant (EF-0334961), The Deep Scaly Project: Resolving Squamate Phylogeny using Genomic and Morphological Approaches, to Drs. Jacques Gauthier of Yale University, Maureen Kearney of the Field Museum, Mike Lee of the University of Adelaide, Jessie Maisano of The University of Texas at Austin, Tod Reeder of San Diego State University, Olivier Rieppel of the Field Museum, Jack Sites of Brigham Young University, and John Wiens of SUNY Stonybrook.

Dorsal view of specimen

Lateral view of head

Dorsal view of head

About this Specimen

The specimen was scanned by Richard Ketcham on 11 February 2003 obliquely along the coronal axis for a total of 459 slices, each slice 0.0192 mm thick with an interslice spacing of 0.0192 mm.

About the
Scan

Literature

Bellairs Ad'A, Gans C. 1983. A reinterpretation of the amphisbaenian orbitosphenoid. Nature (London) 302:243–244.

Berman DS. 1973. Spathorhynchus fossorium, a Middle Eocene amphisbaenian (Reptilia) from Wyoming. Copeia 1973:704-721.

Berman DS. 1976. A new amphisbaenian (Reptilia: Amphisbaenia) from the Oligocene-Miocene John Day Formation, Oregon. J Paleo 50:165-174.

deBeer GR. 1937. The development of the vertebrate skull. Oxford: Oxford University Press. 552 p.

El-Assy YS, Al-Nassar NA. 1976. Morphological study of the cranial osteology of the amphisbaenian Diplometopon zarudnyi. Journal of the University of Kuwait (Sci) 3:113-141.

Estes R, de Queiroz K, Gauthier J. 1988. Phylogenetic relationships within Squamata. In: Estes R, Pregill G, editors. Phylogenetic relationships of the lizard families: essays commemorating Charles L. Camp. Stanford: Stanford University Press. p 119–281.

Gans C. 1960. Studies on amphisbaenids (Amphisbaenia, Reptilia). 1. A taxonomic revision of the Trogonophinae and a functional interpretation of the amphisbaenid adaptive pattern. Bulletin of the American Museum of Natural History 119:129–204.

Gans C. 1974. Biomechanics. An approach to vertebrate biology. Philadelphia: JP Lippincott. 261 p.

Gans C. 1978. The characteristics and affinities of the Amphisbaenia. Transactions of the Zoological Society of London 34:347–416.

Jollie MT. 1960. The head skeleton of the lizard. Acta Zool 41:1–64.

Kearney M. 2003. Systematics and evolution of the Amphisbaenia (Reptilia: Squamata) based on morphological evidence from fossil and living forms. Herpetological Monographs 17:1-75.

Kearney M, Maisano JA, Rowe T. 2005. Cranial anatomy of the extinct amphisbaenian Rhineura hatcherii (Squamata, Amphisbaenia) based on high-resolution x-ray computed tomography. Journal of Morpholology Early View.

Kearney, M, Stuart B. 2004. Repeated evolution of limblessness and digging heads revealed by DNA from old bones. Proceedings of the Royal Society of London Series B 271:1677-1683.

Kesteven L. 1957. Notes on the skull and cephalic muscles of the Amphisbaenia. Proc Linn Soc New South Wales 82:109–116.

Kritzinger CC. 1946.

The cranial anatomy and kinesis of the South African amphisbaenid Monopeltis capensis Smtih. S Afr J Sci 42:175-204.

Lakjer T. 1927. Studien όber die Gaumenregion bei Sauriern im Vergleich mit Anamniern und primitiven Sauropsiden. Zool Jahrb (Anat) 49:57–356.

Montero R, Gans C. 1999. The head skeleton of Amphisbaena alba Linnaeus. Annals of the Carnegie Museum 68:15–80.

Montero R, Gans C, Lions M. 1999. Embryonic development of the skeleton of Amphisbaena darwini heterozonata (Squamata:Amphisbaenidae). Journal of Morphology 239:1–25.

Oelrich TM. 1956. The anatomy of the head of Ctenosaura pectinata (Iguanidae). Miscellaneous Publications of the Museum of Zoology, University of Michigan 94:1–122.

Vanzolini PE. 1951. Evolution, adaptation and distribution of the amphisbaenid lizards (Sauria: Amphisbaenidae). Thesis, Harvard University. 148 p.

Zangerl R. 1944. Contributions to the osteology of the skull of the Amphisbaenidae. American Midland Naturalist 31:417–454.

Links

Trogonophidae page from the EMBL Reptile Database

Literature
& Links
Additional
Imagery

To cite this page: Dr. Jessie Maisano, Dr. Maureen Kearney, Dr. Timothy Rowe, 2005, "Diplometopon zarudnyi" (On-line), Digital Morphology. Accessed November 26, 2014 at http://digimorph.org/specimens/Diplometopon_zarudnyi/.

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