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Phrynosoma douglassii, Pygmy Short-horned Lizard
Dr. Wendy Hodges - University of California at Riverside
Phrynosoma douglassii
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University of California Museum of Vertebrate Zoology (MVZ 80250)

Image processing: Ms. Megan Demarest
Publication Date: 15 Oct 2003


Phrynosoma douglassii, the pygmy short-horned lizard, is restricted to higher elevations in the Pacific Northwest in northern California, north through Washington to British Columbia, Canada and east through southeastern Idaho. P. douglassii can be distinguished from other horned lizard species by the following: small size; one row of lateral abdominal fringe scales; head spines very short and reduced to tubercles, project vertically; deep notch between occipital spines; and dorsal scales irregular in size and distribution, set in a rosette of smaller keeled scales.

About the Species

This specimen (MVZ 80250) was collected by R.R Montanucci and R.L. Westcott in the ice caves west of Aberdeen Power Company in Idaho. It was made available to the University of Texas High-Resolution X-ray CT Facility for scanning by Dr. Wendy Hodges of the Department of Biology, University of California, Riverside. Funding for scanning was provided by a National Science Foundation grant (DBI-0204459) to Dr. Hodges. Funding for image processing was provided by a National Science Foundation Digital Libraries Initiative grant to Dr. Timothy Rowe of the Department of Geological Sciences, The University of Texas at Austin.

Dorsal view of specimen

Dorsal view of head

Lateral view of head

About this Specimen

The specimen was scanned by Matthew Colbert on 27 June 2003 along the coronal axis for a total of 810 slices, each slice 0.0271 mm thick with an interslice spacing of 0.0271 mm.

About the


Frost, D. R., and R. Etheridge. 1989. A phylogenetic analysis and taxonomy of iguanian lizards (Reptilia: Squamata). University of Kansas Museum of Natural History Miscellaneous Publication 81.

Pianka, E. R., and W. S. Parker. 1975. Ecology of horned lizards: A review with special reference to Phrynosoma platyrhinos Copeia 1975:141-162.

Presch, W. 1969. Evolutionary osteology and relationships of the horned lizard genus Phrynosoma (Family Iguanidae) Copeia 1969:250-275.

Reeve, W. L. 1952. Taxonomy and distribution of the horned lizard genus Phrynosoma. University of Kansas Science Bulletin 34:817-960.

Smith, H. M. 1946. Handbook of Lizards: Lizards of the United States and of Canada. Comstock Publishing Co., Ithaca, New York.


More on horned lizards from Eric Pianka and Wendy Hodges

Images of Phrynosoma douglassii on californiaherps.com

P. douglassii page from Northern State University (South Dakota)

The Horned Lizard Conservation Society

& Links

None available.


To cite this page: Dr. Wendy Hodges, 2003, "Phrynosoma douglassii" (On-line), Digital Morphology. Accessed July 22, 2024 at http://digimorph.org/specimens/Phrynosoma_douglassii/.

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