Horned lizard - Wikipedia
Phrynosoma, whose members are known as the horned lizards, horny toads, or horntoads, is a genus of North American lizards and the type genus of the family Phrynosomatidae. Their common names refer directly to their horns or to their flattened, rounded bodies, and blunt snouts.
How the Horned Lizard Got Its Horns | Science - AAAS
2004年4月2日 · When shrikes attack horned lizards, they typically spear the lizard through the neck and pull off the soft tissue. What remains is a record of the successful shrike predation attempts marked by desiccated skulls of horned lizards hanging in trees and bushes .
Horned lizard skulls - DigiMorph
Horned lizard skulls. Three-dimensional reconstructions of the skulls of the thirteen extant species of horned lizards. Skulls are roughly arranged according to increasing horn prominence. The parietal (=occipital) and squamosal (=temporal) horns are a distinguishing characteristic of horned lizards.
Digimorph, Horned Lizards
Other characters that set apart the horned lizards include their expanded skulls adorned with parietal (=occipital) and squamosal (=temporal) horns, an expanded sternum with enlarged fontanelle and reduced ribs, and a reduced pectoral girdle, caudal vertebrae, and epipterygoid.
We quantified selection on relative horn lengths of flat-tailed horn lizards, by comparing measurements of live lizards with those from skulls of lizards killed by shrikes and collected from their repository on bushes (primarily creosote). Collections were made on the Barry M. Goldwater Air Force Gunnery Range outside Yuma, Arizona, in 1996 and ...
Ceratosaurus: “Horned Lizard” - ZME Science
2024年2月22日 · Ceratosaurus ‘ skull was large and robust, equipped with long, blade-like teeth that were ideal for gripping and slicing through flesh. The most striking feature of the skull was a...
ADW: Phrynosoma douglassii: INFORMATION
Phrynosoma douglassii is the most widely distributed of the Horned Lizards. There are five subspecies which range from southwestern Canada through the western United States to as far south as central Mexico (Manaster 1997).
skulls of horned lizards are a synapomorphy of this monophyletic clade (12, 13) that naturally lead to questions concerning the origin and maintenance of this conspicuous trait. Although we agree with Young et al. that the origin and maintenance of horns in Phrynosoma is a question of much interest, we argue that the explanation they have
skull are accompanied by reduction in the pectoral girdle, wide expansion of the sternal plate and reduction in the number of caudal vertebrae. The roof of the flattened skull is supported by the jugal, postorbital and squamosal, which join in a massive suture. The epipterygoid has lost its function of support and is reduced or completely lost.
<i>Moloch</i> - University of Texas at Austin
Horned lizard skulls possess boney spines inside each of the many spines on their heads (top, left), but the spines of thorny devils are constructed from keratin rather than bone (bottom, left). Each has evolved spines independently using different anatomical pathways, an example of convergent evolution in these ecological equivalents.