Introduction to Horned Lizards of North America (Revised by Wade C. Sherbrooke

By Wade C. Sherbrooke

  • Features distinctive species debts; provides details on horned lizard biology, ecology, and evolution; and describes the function of those attention-grabbing reptiles in mythology, tradition, and art
  • Covers the USA, Mexico, and Canada, and contains all species of horned lizards

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Extra info for Introduction to Horned Lizards of North America (Revised Edition) (California Natural History Guides, Volume 64)

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Ditmarsi) Giant (P. asio) Bull (P. taurus) Short-tail (P. braconnieri) Sand lizard relatives In the Past Today H Y P O T H E S I Z E D R E L AT I O N S H I P S O F L I V I N G S P E C I E S 19 Flow Diagram for Identification Start at left and follow lines/arrows to right while tracking diverging character choices. No fringe scales Single row of fringe scales Tail length normal No horn notch Notch between short horns Tail very short Double row of fringe scales 20 F L O W D I A G R A M F O R I D E N T I F I C AT I O N Identifying Characteristics Horned Lizard Species Always check Map of Distribution to see possible species occurring in area *Found only in Mexico See photographs, pp.

In this species the two median horns are particularly long and sharp. The chin spines along the lower jaw are also long and narrow. , CANADA, AND MEXICO Plate 15. Flat-tail Horned Lizard (Phrynosoma mcallii). Plate 16. Flat-tail Horned Lizard (Phrynosoma mcallii) habitat in Algodones Dunes, Imperial County, California. , CANADA, AND MEXICO 41 Flat-tail Horned Lizard Range Flat-tail Horned Lizard has a double row of fringe scales along each side of the body; scales in the lower row are smaller. This is the only species with a dark vertebral line down the middle of its back.

5 inches in snout-to-vent length. , CANADA, AND MEXICO central horns, the bases of which are all in contact. These horns grade uniformly into adjacent temporal horns, forming a complete crown and giving the species a regal appearance. The horns are rather flattened and are broader than they are thick. A single row of large fringe scales extends along each side of the body. On the upper surface, numerous large, erect Plate 21. Regal Horned Lizard (Phrynosoma solare). scales give this horned lizard a particularly spiny appearance.

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