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A Production of

Rhineura hatcheriiFossil, Fossil Worm Lizard
Dr. Maureen Kearney - Field Museum of Natural History
Dr. Jessie Maisano, Dr. Timothy Rowe
Rhineura hatcherii
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skull
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Badlands National Park (BADL 18306; formerly SDSM 3040)

Image processing: Dr. Jessie Maisano
Publication Date: 07 Dec 2004

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The imagery on this page was the basis for a paper entitled Cranial anatomy of the extinct amphisbaenian Rhineura hatcherii (Squamata, Amphisbaenia) based on high-resolution X-ray computed tomography by M. Kearney, J. A. Maisano and T. Rowe (Journal of Morphology 264:1-33, 2005). The abstract is as follows:

       The fossilized skull of a small extinct amphisbaenian referable to Rhineura hatcherii Baur is        described from high-resolution X-ray computed tomographic (HRXCT) imagery of a well-preserved        mature specimen from the Brule Formation of Badlands National Park, South Dakota. Marked density        contrast between bones and surrounding matrix and at bone-to-bone sutures enabled the digital        disarticulation of individual skull elements (see Additional Imagery). These novel visualizations provide        insight into the otherwise inaccessible three-dimensionally complex structure of the bones of the        skull and their relationships to one another, and to the internal cavities and passageways that they        enclose. This study corrects several previous misidentifications of elements in the rhineurid skull and        sheds light on skull construction generally in shovel-headed amphisbaenians. The orbitosphenoids in        R. hatcherii are paired and entirely enclosed within the braincase by the frontals; this is in contrast        to the condition in many extant amphisbaenians, in which a large azygous orbitosphenoid occupies a        topologically distinct area of the skull, closing the anterolateral braincase wall. Rhineura hatcherii        retains a vestigial jugal and a partially fused squamosal, both of which are absent in many extant        species. Sculpturing on the snout of R. hatcherii represents perforating canals conveying sensory        innervation; thus, the face of R. hatcherii receives cutaneous innervation to an unprecedented        degree. The HRXCT data (available at www.digimorph.org) corroborate and extend previous        hypotheses that the mechanical organization of the head in Rhineura is organized to a large degree        around its burrowing lifestyle.

DigiMorph Account of Rhineura hatcherii

Rhineura is a member of Amphisbaenia, a lineage (160 species) of mostly limbless burrowing squamates. The amphisbaenian skull classically has been difficult to study due to its small size (this specimen measures just 1.5 cm in length) and largely closed construction, but high-resolution industrial CT offers a solution to these problems.

There are four major amphisbaenian groups: Bipedidae, the only one to have forelimbs; Amphisbaenidae, the most diverse (149 species) and widespread lineage (see Anops kingii and Loveridgea ionidesii); Trogonophidae, whose members use an oscillating excavation pattern (see Diplometopon zarudnyi); and Rhineuridae, to which Rhineura belongs. Amphisbaenians occur in northern and sub-saharan Africa, southwest Asia, the Mediterranean, South America east of the Andes, the West Indies, western Mexico, Baja California, the southeasternmost United States, and Cuba. They are poorly represented in collections, and little is known of their life history, because of their burrowing lifestyle.

Rhineuridae includes a number of fossil forms (all restricted to western North America) but only one living species – Rhineura floridana – which occurs in central Florida and Georgia. The specimen featured here is referable to Rhineura hatcherii, known from the Middle to Upper Oligocene of South Dakota, Nebraska, and Colorado. Rhineura hatcherii is very similar to R. floridana, but differs in part in having up to seven maxillary and dentary teeth and a sagittal crest.

Rhineura floridana
About the Species

This specimen was collected from the Brule Formation (Orellan) in Cottonwood Pass, Badlands National Park, South Dakota. It was made available to the University of Texas High-Resolution X-ray CT Facility for scanning by Michael Greenwald of the Museum of Geology, South Dakota School of Mines and Technology and Dr. Timothy Rowe of The University of Texas at Austin. Funding for scanning was provided by a National Science Foundation Digital Libraries Initiative grant to Dr. Rowe.

Although the specimen has been largely prepared, it is still filled with matrix (the dark gray material in the imagery). Because the specimen and the matrix are so different in density, the matrix can be digitally prepared away using the CT data; an animation of the "prepared" skull rotating around the horizontal axis is shown above.

Dorsal view

Lateral view

Ventral view

About this Specimen

The specimen was scanned by Richard Ketcham on 23 October 2000 along the coronal axis for a total of 414 slices. Each slice is 0.0373 mm thick, with an interslice spacing of 0.0373 mm and a field of reconstruction of 7.5 mm.

About the
Scan

Literature

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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. Journal of Paleontology 50:165–174.

Cope ED. 1900. Crocodilians, lizards and snakes of North America. Annual Report of the US National Museum 1898:153–1270.

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

Eigenmann CH. 1902. The eyes of Rhineura floridana. Washington Academy of Sciences Proceedings 4:533–548.

Estes R. 1983. Sauria terrestria, Amphisbaenia. Handbuch der Paläoherpetologie, Teil 10A. Stuttgart: Gustav Fischer Verlag. 249 p.

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.

Gabe M, Saint Girons H. 1976. Contribution a la morphologie comparée des fosses nasales et de leurs annexes chez les lépiodsauriens. Mémoires du Muséum National d'Histoire Naturelle A98:1-87 (+ plates).

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 London 34:347–416.

Gans C, Wever E. 1972. The ear and hearing in Amphisbaenia (Reptilia). Journal of Experimental Zoology 179:17–34.

Gans C, Wever E. 1975. The amphisbaenian ear: Blanus cinereus and Diplometopon zarudnyi. Proceedings of the National Academy of Sciences 72:1487–1490.

Gilmore CW. 1928. Descriptions of new and little-known fossil lizards from North America. Proceedings of the US National Museum 86:11–26.

Jollie MT. 1960. The head skeleton of the lizard. Acta Zoologica 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 17:1-74.

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 Morphology (in press).

Kesteven L. 1957. Notes on the skull and cephalic muscles of the Amphisbaenia. Proceedings of the Linnean Society New South Wales 82:109–116.

Kritzinger CC. 1946. The cranial anatomy and kinesis of the South African amphisbaenid Monopeltis capensis Smith. South African Journal of Science 42:175–204.

Lakjer T. 1927. Studien über die Gaumenregion bei Sauriern im Vergleich mit Anamniern und primitiven Sauropsiden. Zoologische Jahrbucher (Anatomie) 49:57–356.

McMahon T, Bonner JT. 1983. On size and life. New York: Scientific American Library. 255 p.

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

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Romer AS. 1956. Osteology of the reptiles. Chicago: University of Chicago Press. 772 p.

Rowe T. 1986. Homology and evolution of the deep dorsal thigh musculature in birds and other Reptilia. Journal of Morphology 198:327–346.

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Schwenk K. 1993. Are geckos olfactory specialists? Journal of Zoology London 229:289-302.

Starck D. 1979. Vergleichende Anatomie der Wirbeltiere auf evolutionsbiologischer Grundlage. Volume 2. Das Skeletsystem Allgemeines, Skeletsubstanzen, Skelet der Wirbeltiere einschlieblich Lokomotionstypen. Berlin: Springer Verlag. 776 p.

Taylor EH. 1951. Concerning Oligocene amphisbaenid reptiles. University of Kansas Science Bulletin 34:521–579.

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

More information on the geology of the White River Formation and Badlands National Park from the National Park Service

Literature
& Links

False-color dynamic cutaway animations. All are less than 2mb.

coronal cutaway movie

horizontal cutaway movie

sagittal cutaway movie

Three-dimensional volumetric renderings of isolated cranial bones. Movies are 1 mb unless otherwise noted.

skull roll movie (2mb)

skull yaw movie (2mb)

skull pitch movie (2mb)

premaxilla roll movie

premaxilla yaw movie

premaxilla pitch movie

maxilla roll movie

maxilla yaw movie

maxilla pitch movie

nasal roll movie

nasal yaw movie

nasal pitch movie

septomaxilla roll movie

septomaxilla yaw movie

septomaxilla pitch movie

vomer roll movie

vomer yaw movie

vomer pitch movie

palatine roll movie

palatine yaw movie

palatine pitch movie

ectopterygoid roll movie

ectopterygoid yaw movie

ectopterygoid pitch movie

pterygoid roll movie

pterygoid yaw movie

pterygoid pitch movie

prefrontal roll movie

prefrontal yaw movie

prefrontal pitch movie

frontal roll movie

frontal yaw movie (2mb)

frontal pitch movie

parietal roll movie (2mb)

parietal yaw movie

parietal pitch movie (2mb)

occipital complex roll movie (2mb)

occipital complex yaw movie (2mb)

occipital complex pitch movie (2mb)

occipital complex horizontal cutaway movie (3mb)

occipital complex sagittal cutaway movie (3mb)

orbitosphenoid roll movie

orbitosphenoid yaw movie

orbitosphenoid pitch movie

quadrate roll movie

quadrate yaw movie

quadrate pitch movie

stapes roll movie

stapes yaw movie

mandible roll movie

mandible yaw movie

mandible pitch movie

dentary roll movie

dentary yaw movie

dentary pitch movie

splenial roll movie

splenial yaw movie

splenial pitch movie

coronoid roll movie

coronoid yaw movie

coronoid pitch movie

compound bone roll movie

compound bone yaw movie

compound bone pitch movie

Additional
Imagery

To cite this page: Dr. Maureen Kearney, Dr. Jessie Maisano, Dr. Timothy Rowe, 2004, "Rhineura hatcherii" (On-line), Digital Morphology. Accessed November 22, 2014 at http://digimorph.org/specimens/Rhineura_hatcheri/.

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