Pygmy short-horned lizard
|Pygmy short-horned lizard|
The pygmy short-horned lizard (Phrynosoma douglasii) is a species of small horned lizard that occurs in the northwestern United States. In the past it also occurred in adjacent Canada. Like other horned lizards, it is often called a "horned toad" or "horny toad," but it is not a toad at all. It is a reptile, not an amphibian.
The pygmy short-horned lizard is often mistaken for its close relative the greater short-horned lizard (P. hernandesi ) which has the same basic body type consisting of small pointed scales around the head and back. Until recent mitochondrial DNA evidence, the greater short-horned was considered to be the same species as the pygmy short-horned. They are now considered distinct species with the pygmy short-horned lizard occupying the northwest portion of the United States and extreme southern British Columbia (now extirpated from Canada). When placed together the two are easily distinguished at full size, the pygmy short-horned lizard being much smaller. The greater short-horned lizard is a highly variable species with different geographic populations exhibiting differences in color, pattern, and size, with some authorities describing five subspecies. The pygmy short-horned lizard ranges in size from 1.25–2.5 in (3.2–6.4 cm) in snout-to-vent length (SVL) and is a flat-bodied, squat lizard with short spines crowning the head. They have a snub-nosed profile and short legs. The trunk is fringed by one row of pointed scales, while the belly scales are smooth. The color is gray, yellowish, or reddish-brown, and there are two rows of large dark spots on the back. When threatened or aggressive, their colors become more intense.
- Hammerson, G.A. (2007). Phrynosoma douglasii. The IUCN Red List of Threatened Species doi:10.2305/IUCN.UK.2007.RLTS.T64075A12741891.en
- The Reptile Database. .
- Sherbrooke, Wade C. 2003. Introduction to Horned Lizards of North America. California Natural History Guides. Oakland, California: University of California Press. 191 pp. ISBN 978-0520228276.
- Beolens, Bo; Watkins, Michael; Grayson, Michael. (2011). "Phrynosoma douglasi", p. 75 The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. ISBN 978-1-4214-0135-5.
- Stebbins, Robert C. (2003). "Phrynosoma douglasii", pp. 303–304 + Plate 34 + Map 101 in A Field Guide to Western Reptiles and Amphibians: Third Edition. The Peterson Field Guide Series. Boston and New York: Houghton Mifflin Company. ISBN 978-0-395-98272-3.
- Bell, Thomas. 1828. "Description of a new Species of Agama, brought from the Columbia River by Mr. Douglass [sic]". Trans. Linnean Soc. London 16: 105–107 + Plate X. ("Agama Douglassii [sic]", new species). (in English and Latin).
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- Data related to Pygmy short-horned lizard at Wikispecies