horned lizard

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Related to horned lizards: Phrynosoma

horned lizard

or

horned toad,

broad, flat-bodied lizards of the genus Phrynosoma, found in arid regions from extreme SW Canada to Guatemala. There are several species in the United States W of the Mississippi. The body is 3 to 5 in. (7.6 to 12.7 cm) long; it has a short, thin tail, a short neck, and short legs. There are spines on the head, sides, and back. Horned lizards are protectively colored, usually in dull grays and browns. They feed on insects, especially ants, and are often found buried in the sand, with only their heads exposed. In some species the female lays eggs; in others the eggs are incubated internally and the young are born alive. When alarmed, members of some species eject a thin stream of blood from the nictitating membrane of the eye for a distance of several feet. Horned lizards are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, order Squamata, family Iguanidae.
References in periodicals archive ?
The CHL is separated in range and habitat from the other two California Horned Lizards, P.
Most horned lizards from the long-horned lizard clade are considered highly myrmecophagous, having increased cranial morphologies that contrast with species that consume large numbers of non-ant prey (Montanucci, 1989; Meyers et al.
And with the aid of the radio backpack-equipped horned lizards, they hope to uncover further data to help man and nature live in harmony.
In Texas, horned lizards have disappeared from at least 30 percent of their historic range, mostly in the central and eastern portions, according to state biologists.
All of the species in South Dakota except the horned lizard will lose their tall to e scape from predators.
NOTES ON REPRODUCTION IN TWO SPECIES OF HORNED LIZARD (PI-IRYNOSOMA) IN NORTHERN UTAH AND SOUTHEASTERN IDAHO.
Reproduction in the short horned lizard Phrynosoma douglassi in Arizona.
our replicate sample units (numbers) for each observational category (hour of the day) were single readings taken at the precise location of an individual lizard or means of readings of multiple Texas horned lizards found for an hour of a particular survey.
Over the course of millions of years, populations of horned lizards migrating northward have separated and diverged from one another, producing an array of genetic lineages all along the western coast of North America that are adapted to unique ecological niches, according to the study.
Argentine ants, which follow humans for their food, could take another food source away from horned lizards, a rare species, Long said.
Young of Utah State University in Logan, a coauthor of the new study, monitored the population of the flat-tailed horned lizard (Phrynosoma mcalli) in the desert near Yuma, Ariz.
Therefore, excessive movement by horned lizards, either for capturing highly evasive prey or as a result of aggression from prey, likely negates the advantages of camouflage (Pianka & Parker 1975; Rissing 1981).