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[[File:Horned lizard 032507 kdh.jpg|thumb|Regal horned lizard]]
[[File:Horned lizard 032507 kdh.jpg|thumb|Regal horned lizard]]
The '''regal horned lizard''' ('''''Phrynosoma solare''''') is a [[horned lizard]] [[species]] native to [[Mexico]] and the [[Southwest United States]].<ref name=Varanus>{{cite web|url=http://uts.cc.utexas.edu/~varanus/phryno.html |title=Horned Lizards |authors=Pianka, Eric R. and Hodges, Wendy L. |work=Varanus: the Pianka lab page }}</ref>
The '''regal horned lizard''' ('''''Phrynosoma solare''''') is a [[horned lizard]] [[species]] native to [[Mexico]] and the [[Southwest United States]].<ref name=Varanus>{{cite web|url=http://uts.cc.utexas.edu/~varanus/phryno.html |title=Horned Lizards |author1=Pianka, Eric R. |author2=Hodges, Wendy L. |work=Varanus: the Pianka lab page }}</ref>


==Description==
==Description==
The regal horned lizard is a small, flat lizard about the size of the palm of a man's hand. Though it has spikes all around its body, the regal horn's main defense is the ability to squirt blood from its eyes.
The regal horned lizard is a small, flat lizard about the size of the palm of a human's hand. It has spikes all around the lateral surface of its body. It is 3–4 in (117&nbsp;mm) in length from nose to tail as a full adult, and pale grey to yellow-brown or reddish in color, topped with dark blotches alongside the body and back. Its four legs each have five toes with a claw on each toe. The species is a slow runner that uses camouflage to escape predators.<ref>{{cite book|last1=Sherbrooke|first1=Wade C.|title=Introduction to Horned Lizards of North America|date=2003|publisher=University of California Press}}</ref>
* 3–4 inches or 117&nbsp;mm in length from nose to tail as a full adult.
* Pale grey to yellow-brown or reddish topped with dark blotches alongside the body and back.
* 4 legs each leg with 5 toes and claws on each toe.
* Slow runner that uses camouflage to escape predators.<ref>{{cite book|last1=Sherbrooke|first1=Wade C.|title=Introduction to Horned Lizards of North America|date=2003|publisher=University of California Press}}</ref>


==Distribution==
==Distribution==
This lizard can be found across southeastern Arizona and along the transition of the southern zone of the central mountains region.<ref>{{cite web|url=http://www.reptilesofaz.org/Lizards-Subpages/h-p-solare.html |title=REGAL HORNED LIZARD ''Phrynosoma (Anota) solare'' |author=Brennan, Thomas C. |year=2008}}</ref>
This lizard can be found across southeastern Arizona and along the transition of the southern zone of the central mountains region.<ref>{{cite web|url=http://www.reptilesofaz.org/Lizards-Subpages/h-p-solare.html |title=REGAL HORNED LIZARD ''Phrynosoma (Anota) solare'' |author=Brennan, Thomas C. |year=2008}}</ref>


==Habitat==
==Habitat and Home Range==
This horned lizard occupies primarily level or gently sloping terrain with openly spaced [[desert]] vegetation such as [[mesquite]], [[creosote bush]], and [[saguaro]] cactus.<ref name=Varanus/> It can be found primarily in a hot and dry climate where the Earth may be covered in limestone dust.<ref>{{cite journal|last1=Suarez|first1=Andrew|last2=Richmond|first2=Jon|last3=Case|first3=Ted |title=Prey selection in horned lizards following the invasion of Argentine ants in southern California|journal=Ecological Applications |year=2000|volume=10 |issue=3|pages=711–725 |doi=10.1890/1051-0761(2000)010[0711:PSIHLF]2.0.CO;2}}</ref> It is found in the Sonoran Desert Mountains is where it prefers its climate, but can be found in Texas, southern California, Arizona, and New Mexico.<ref>{{cite journal|last1=Parker |first1=William S. |year=1971 |title=Ecological observation on the regal horned lizard in Arizona|journal=Herpetologica |volume=27 |issue=3 |pages=333–338 |jstor=3890846}}</ref>
This horned lizard occupies primarily level or gently sloping terrain with openly spaced [[desert]] vegetation such as [[mesquite]], [[creosote bush]], and [[saguaro]] cactus.<ref name=Varanus/> It can be found primarily in a hot and dry climate where the ground may be covered in limestone dust.<ref>{{cite journal|last1=Suarez|first1=Andrew|last2=Richmond|first2=Jon|last3=Case|first3=Ted |title=Prey selection in horned lizards following the invasion of Argentine ants in southern California|journal=Ecological Applications |year=2000|volume=10 |issue=3|pages=711–725 |doi=10.1890/1051-0761(2000)010[0711:PSIHLF]2.0.CO;2}}</ref> It is found in the Sonoran Desert Mountains is where it prefers its climate, but can be found in Texas, southern California, Arizona, and New Mexico.<ref>{{cite journal|last1=Parker |first1=William S. |year=1971 |title=Ecological observation on the regal horned lizard in Arizona|journal=Herpetologica |volume=27 |issue=3 |pages=333–338 |jstor=3890846}}</ref> It
has been shown to have a relatively small home range of roughly 160 yards (146 meters).<ref>Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare)
in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846</ref>


==Diet==
==Diet==
They eat mostly harvester ants, and can eat twenty-five hundred ants in one meal. They are slow eaters, because they spend most of their time in the intense heat of the desert during meals. They eat flies, spiders, and a variety of insects.<ref name=Mattison/>
Their diet consists almost exclusively of harvester ants, and can eat 2500 ants in one meal.<ref>Sullivan, B. K., Sullivan, K. O., Vardukyan, D., & Suminski, T. (2014). Persistence of Horned
Lizards (Phrynosoma spp.) in urban preserves of Central Arizona. Urban Ecosystems, 17(3),
707-717. https://doi.org/10.1007/s11252-014-0353-4
</ref> They are slow eaters, because they spend most of their time in the intense heat of the desert during meals. They have been observed consuming a some other insects, and spiders.<ref name=Mattison/>


==Behavior==
==Behavior==
Adult regal horned lizards are active year round however, they are most active from April to September during the hours of 6:00 and 9:00 AM. <ref>Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare)
⚫
This is a year-round active type of lizard, but during winter, its activity is usually restricted to unseasonably warm days. They may hibernate late September through October. The lizard basks in the sun with only its head poking out of the sand. The blood is heated within a chamber inside the head. When the blood is hot enough, the reptile opens a valve in its neck and circulates the blood around the body. It looks for shelter from cold temperatures by digging holes in the ground. When it is threatened or captured, it squirts blood from its eye. This blood may have a taste used to deter predators. If the camouflage and intimidation does not work, that is when they squirt out blood aiming for the predators mouth and eyes. This stream can range up to 4 feet and may be repeated several times. The stream comes out through its lower eyelids' pores. Some other defensive behaviors include gulping air and poking with the horns.<ref name=Mattison>{{cite book|last1=Mattison |first1=Christopher |title=Lizards of the World |date=1989|place=New York, NY}}</ref>
in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846</ref> During winter, their activity is usually restricted to unseasonably warm days. They may hibernate late September through October. They tend to be sedentary creatures which is reflected in their morphology (often
displaying matching color patterns to their environment as camouflage). This is also reflected in their limited home range. <ref>Lowe, C. H. (1954). Normal Field Movements and Growth rates of Marked Regal Horned
Lizards (Phrynosoma Solare). Ecology, 35(3), 420–421. https://doi.org/10.2307/1930110</ref> The regal horned lizard will often bask in the sun with only its head poking out of the sand in order to heat blood located within a chamber inside the head. When the blood is warm enough, the lizard opens a valve in its neck and circulates the blood around the body. It derives shelter and builds nests through digging holes in the ground. They seem to be very protective of these nests as one study observed a female placing herself between the hole and the researcher. <ref>Van Devender, T. R., & Howard, C. W. (1973). Notes on Natural Nests and Hatching Success in
the Regal Horned Lizard (Phrynosoma solare) in Southern Arizona. Herpetologica, 29(3), 238–
239. http://www.jstor.org/stable/3892009</ref> Typically they remain still above ground until temperatures reach above 52.2°C. Regal horned lizards generally stay in an open habitat with access to
⚫
burrows to avoid predators and high temperatures. Though they have spikes all around their body, their main defense when coming in contact with predators is the ability to squirt blood from their eyes. When they are threatened or captured, they may exhibit this blood squirting behavior. This blood may have a taste used to deter predators. They typically only resort to this if camouflage and intimidation do not work. When it squirts out blood, it aims for the predator's mouth and eyes. This stream can range up to 4 feet and may be repeated several times. The stream comes out through its lower eyelids' pores. Some other defensive behaviors include gulping air and poking with the horns.<ref name=Mattison>{{cite book|last1=Mattison |first1=Christopher |title=Lizards of the World |date=1989|place=New York, NY}}</ref>


==Reproduction==
==Reproduction==
Regal horned lizards are oviparous and reproduce via sexual reproduction (specifically internal fertilization). Females tend to be ovulating in July and August. Males tend to exhibit enlarged
⚫
Mating for the regal horned lizard begins in late April, peaks in June, and stops abruptly in July. Egg laying starts a few weeks later, usually in late July and early August. About 10–30 eggs are laid (15 on average). The eggs are laid in the sand and are required to stay there for several weeks. The egg shells are white and flexible and average about one-half inch in diameter. The hatch-lings receive no parental care upon hatching and immediately bury themselves in the sand. They are now responsible for finding and hunting for their own food. Several diverting tactics are used to attract a mate, such as: head bopping, push ups, and nodding of the head.<ref>{{cite web|title=''Phrynosoma solare'' (Regal Horned Lizard) |url=http://animaldiversity.org/accounts/Phrynosoma_solare/ |website=Animal Diversity Web}}</ref>
reproductive organs (testes, vasa deferentia, and hemipenes) when in preparation for mating.
Males were shown to have exhibited these enlargements from June to August. Females lay eggs in the generally time range of June to August.<ref>Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare)
in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846</ref> A range of 7–30 eggs are laid per clutch and females typically lay only one clutch annually. The eggs are laid in nests which are semicircular tunnels dug at an angle, allowing the nest to be shaded
for longer periods of the day. Typically they nest in moist fine silt or sand.<ref>Van Devender, T. R., & Howard, C. W. (1973). Notes on Natural Nests and Hatching Success in
the Regal Horned Lizard (Phrynosoma solare) in Southern Arizona. Herpetologica, 29(3), 238–
239. http://www.jstor.org/stable/3892009
⚫
</ref> The egg shells are white and flexible and average about one-half inch in diameter. The hatchlings receive no parental care upon hatching and immediately bury themselves in the sand. They are now responsible for finding and hunting for their own food. Several diverting tactics are used to attract a mate, such as head bopping, push-ups, and nodding of the head.<ref>{{cite web|title=''Phrynosoma solare'' (Regal Horned Lizard) |url=http://animaldiversity.org/accounts/Phrynosoma_solare/ |website=Animal Diversity Web}}</ref>


==References==
==References==

Latest revision as of 22:19, 18 April 2024

Regal horned lizard
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Iguania
Family: Phrynosomatidae
Genus: Phrynosoma
Species:
P. solare
Binomial name
Phrynosoma solare
Gray, 1845[2]
Regal horned lizard

The regal horned lizard (Phrynosoma solare) is a horned lizard species native to Mexico and the Southwest United States.[3]

Description[edit]

The regal horned lizard is a small, flat lizard about the size of the palm of a human's hand. It has spikes all around the lateral surface of its body. It is 3–4 in (117 mm) in length from nose to tail as a full adult, and pale grey to yellow-brown or reddish in color, topped with dark blotches alongside the body and back. Its four legs each have five toes with a claw on each toe. The species is a slow runner that uses camouflage to escape predators.[4]

Distribution[edit]

This lizard can be found across southeastern Arizona and along the transition of the southern zone of the central mountains region.[5]

Habitat and Home Range[edit]

This horned lizard occupies primarily level or gently sloping terrain with openly spaced desert vegetation such as mesquite, creosote bush, and saguaro cactus.[3] It can be found primarily in a hot and dry climate where the ground may be covered in limestone dust.[6] It is found in the Sonoran Desert Mountains is where it prefers its climate, but can be found in Texas, southern California, Arizona, and New Mexico.[7] It has been shown to have a relatively small home range of roughly 160 yards (146 meters).[8]

Diet[edit]

Their diet consists almost exclusively of harvester ants, and can eat 2500 ants in one meal.[9] They are slow eaters, because they spend most of their time in the intense heat of the desert during meals. They have been observed consuming a some other insects, and spiders.[10]

Behavior[edit]

Adult regal horned lizards are active year round however, they are most active from April to September during the hours of 6:00 and 9:00 AM. [11] During winter, their activity is usually restricted to unseasonably warm days. They may hibernate late September through October. They tend to be sedentary creatures which is reflected in their morphology (often displaying matching color patterns to their environment as camouflage). This is also reflected in their limited home range. [12] The regal horned lizard will often bask in the sun with only its head poking out of the sand in order to heat blood located within a chamber inside the head. When the blood is warm enough, the lizard opens a valve in its neck and circulates the blood around the body. It derives shelter and builds nests through digging holes in the ground. They seem to be very protective of these nests as one study observed a female placing herself between the hole and the researcher. [13] Typically they remain still above ground until temperatures reach above 52.2°C. Regal horned lizards generally stay in an open habitat with access to burrows to avoid predators and high temperatures. Though they have spikes all around their body, their main defense when coming in contact with predators is the ability to squirt blood from their eyes. When they are threatened or captured, they may exhibit this blood squirting behavior. This blood may have a taste used to deter predators. They typically only resort to this if camouflage and intimidation do not work. When it squirts out blood, it aims for the predator's mouth and eyes. This stream can range up to 4 feet and may be repeated several times. The stream comes out through its lower eyelids' pores. Some other defensive behaviors include gulping air and poking with the horns.[10]

Reproduction[edit]

Regal horned lizards are oviparous and reproduce via sexual reproduction (specifically internal fertilization). Females tend to be ovulating in July and August. Males tend to exhibit enlarged reproductive organs (testes, vasa deferentia, and hemipenes) when in preparation for mating. Males were shown to have exhibited these enlargements from June to August. Females lay eggs in the generally time range of June to August.[14] A range of 7–30 eggs are laid per clutch and females typically lay only one clutch annually. The eggs are laid in nests which are semicircular tunnels dug at an angle, allowing the nest to be shaded for longer periods of the day. Typically they nest in moist fine silt or sand.[15] The egg shells are white and flexible and average about one-half inch in diameter. The hatchlings receive no parental care upon hatching and immediately bury themselves in the sand. They are now responsible for finding and hunting for their own food. Several diverting tactics are used to attract a mate, such as head bopping, push-ups, and nodding of the head.[16]

References[edit]

  1. ^ Hammerson, G.A., Frost, D.R. & Gadsden, H. (2007). Phrynosoma solare. The IUCN Red List of Threatened Species doi:10.2305/IUCN.UK.2007.RLTS.T64081A12734740.en
  2. ^ "Phrynosoma solare". ZipcodeZoo.com.
  3. ^ a b Pianka, Eric R.; Hodges, Wendy L. "Horned Lizards". Varanus: the Pianka lab page.
  4. ^ Sherbrooke, Wade C. (2003). Introduction to Horned Lizards of North America. University of California Press.
  5. ^ Brennan, Thomas C. (2008). "REGAL HORNED LIZARD Phrynosoma (Anota) solare".
  6. ^ Suarez, Andrew; Richmond, Jon; Case, Ted (2000). "Prey selection in horned lizards following the invasion of Argentine ants in southern California". Ecological Applications. 10 (3): 711–725. doi:10.1890/1051-0761(2000)010[0711:PSIHLF]2.0.CO;2.
  7. ^ Parker, William S. (1971). "Ecological observation on the regal horned lizard in Arizona". Herpetologica. 27 (3): 333–338. JSTOR 3890846.
  8. ^ Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare) in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846
  9. ^ Sullivan, B. K., Sullivan, K. O., Vardukyan, D., & Suminski, T. (2014). Persistence of Horned Lizards (Phrynosoma spp.) in urban preserves of Central Arizona. Urban Ecosystems, 17(3), 707-717. https://doi.org/10.1007/s11252-014-0353-4
  10. ^ a b Mattison, Christopher (1989). Lizards of the World. New York, NY.{{cite book}}: CS1 maint: location missing publisher (link)
  11. ^ Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare) in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846
  12. ^ Lowe, C. H. (1954). Normal Field Movements and Growth rates of Marked Regal Horned Lizards (Phrynosoma Solare). Ecology, 35(3), 420–421. https://doi.org/10.2307/1930110
  13. ^ Van Devender, T. R., & Howard, C. W. (1973). Notes on Natural Nests and Hatching Success in the Regal Horned Lizard (Phrynosoma solare) in Southern Arizona. Herpetologica, 29(3), 238– 239. http://www.jstor.org/stable/3892009
  14. ^ Parker, W. S. (1971). Ecological Observations on the Regal Horned Lizard (Phrynosoma solare) in Arizona. Herpetologica, 27(3), 333–338. http://www.jstor.org/stable/3890846
  15. ^ Van Devender, T. R., & Howard, C. W. (1973). Notes on Natural Nests and Hatching Success in the Regal Horned Lizard (Phrynosoma solare) in Southern Arizona. Herpetologica, 29(3), 238– 239. http://www.jstor.org/stable/3892009
  16. ^ "Phrynosoma solare (Regal Horned Lizard)". Animal Diversity Web.

External links[edit]

Wikimedia Commons has media related to Phrynosoma solare.
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