Reptilia · Squamata
Phrynosoma cerroenseStejneger, 1893
Cedros Island Horned Lizard
Photograph by Juan Cruzado Cortés, CC BY, via iNaturalist
A ground-dwelling, day-active lizard from the Nearctic region, reaching 100 mm snout to vent.
Also called Gulf Coast Horned Lizard.
Reptilia › Squamata › Phrynosomatidae › Phrynosoma
- Grows to
- 100mm
- greatest recorded
- Active
- Diurnal
- Lives
- Terrestrial
- Weighs up to
- 31.55g
- greatest
Longer than 68% of all species in Phrynosomatidae anyone has measured.
The bar is the rank itself: its length is the share of the family this animal exceeds. The chart below is the family’s real spread, on a logarithmic scale because body length here runs from 47 to 175 mm. The solid rule is this animal. Every bar is a count of real species, and nothing on this figure is estimated.
What is known
27 sourced facts, each taken from a named scientific dataset. How to read these.
Cited from a dataset unless a row is marked otherwise.
Standing in the world
- Still living
- Extant
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 33.8°C
- Body temp in the wild · mean, when active
- 37.9°C
body temperature of active animals in nature
Size
- Length snout to vent · greatest recorded
- 100mm4 in
- Length snout to vent · adult female mean
- 74.1mm3 in
- Largest female · snout to vent
- 72.3mm2.75 in
- Body mass · greatestcomputed
- 31.55g1.1 oz
max 100 mm (Heimes 2022, 2nd largest record I have is 85 mm)
snout-vent length; the source column mixes this with straight carapace length
computed from length by a family-level allometric equation, not weighed
How it lives
- Active
- Diurnal
- Where it lives
- Terrestrial
- Biome
- Deserts & Xeric Shrublands
- Active season · months of the year
- 7–12months
- Region
- Nearctic
- Mainland or island
- Mainland
- Elevation · above sea level
- 100–1210m
- Range size
- 11,409km²
sands, Heimes 2022
Breeding
- Reproduction
- Oviparous
- Average clutch
- 25.5eggs
Dominguez-Guerrero et al. 2022
Naming and history
- Suborder
- Sauria
- Infraorder
- Pleurodonta
- Subspecies
- No
- Described by
- Stejneger
- Moved to another genus · since it was first described
- No
- Described in
- 1893
- Type locality
- Mexico
Keeping one
15.5 in × 15.5 in × 9.75 in(40 × 40 × 25 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes ground-dwelling species at 4 × 4 × 2.5 times snout-vent length.
Mindestanforderungen an die Haltung von Reptilien (Sachverständigengutachten), German Federal Ministry for Nutrition, Agriculture and Forestry, Animal Welfare Division, 10 January 1997. The standard states these floor areas are recommendations rather than binding limits.
From this animal’s own snout-vent length of 4 in (100 mm), at 4 × 4 × 2.5 times it, following the German federal welfare standard — how this is worked out.
In a laboratory thermal gradient this species settled at 93 °F (33.8 °C).
Preferred body temperature, recorded in a laboratory gradient where the animal could choose freely. A measurement of the animal, not a setting for a thermostat.
Feeding
4kJ per day
Worked out for an animal of 32 g, the heaviest recorded for Cedros Island Horned Lizard — so it is the top of the range, not a figure for a particular animal. Weigh yours and the number will be lower.
An upper estimate, not a feeding target, and not veterinary advice. The equation covers only what an animal burns staying alive, so a growing, gravid or recovering animal needs more — and it was measured on wild animals, which move far more than one in an enclosure. Body condition and a vet who knows the species are what a feeding decision should rest on. Where this comes from.
What nobody knows
These are not gaps in our research. No scientific dataset records them for this species — and saying so is information you cannot get from a reference that simply leaves a field out.
- — Length snout to vent · adult male mean
- — Length snout to vent · adult mean
- — Length nose to tail · greatest recorded
- — Female length · mean, nose to tail
- — Length nose to tail · adult male mean
- — Length nose to tail · adult mean
- — Largest male · snout to vent
- — Largest female · shell length
- — Largest male · shell length
- — Hatchling length · snout to vent
- — Hatchling length · nose to tail
- — Largest juvenile · snout to vent
- — Largest juvenile · shell length
- — Egg length
- — Egg width
- — Body mass · a typical adult
- — Body mass · adult female, mean
- — Body mass at hatching
- — Longest recorded life
- — Body temperature when active · measured in the wild
- — Diet
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — How the young develop
- — Gestation or incubation
- — Smallest clutch recorded
- — Largest clutch recorded
- — Mean clutch · smallest reported
- — Mean clutch · largest reported
- — Clutches in a year
- — Clutches a year · fewest
- — Clutches a year · most
- — First breeds from · youngest recorded
- — First breeds by · oldest recorded
- — Hatchling length · smallest recorded
- — Hatchling length · largest recorded
- — Age at first breeding · female
- — Mature from · youngest recorded
- — Mature by · oldest recorded
- — Size at maturity · smallest recorded
- — Size at maturity · largest recorded
- — Colour on the back
- — Pattern on the back
- — Pupil
- — Sex decided by
- — Conservation status
- — Status assessed · the year the Red List last looked
- — Population trend
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Habitat
- — Active in
Others in Phrynosomatidae
Take this data
Everything on this page is available as data under CC BY 4.0 — use it freely, credit it, no permission needed.
This species as JSON · the whole dataset
Cite this page
The Reptile & Amphibian Encyclopedia (2026). Phrynosoma cerroense. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/phrynosoma-cerroense
@misc{phrynosoma_cerroense_2026,
title = {Phrynosoma cerroense},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/phrynosoma-cerroense}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.
- Catalogue of Life (dataset 3LR), used under CC BY.