Reptilia · Squamata
Phymaturus williamsiLobo, Laspiur, Acosta, 2013
Calingasta Chuckwalla
No photograph of this species exists under a license anyone may reuse. It gets the same page regardless.
A rock-dwelling, day-active, plant-eating lizard from the Neotropic region, reaching 109 mm snout to vent.
Reptilia › Squamata › Liolaemidae › Phymaturus
- Grows to
- 109mm
- greatest recorded
- Eats
- Herbivorous
- Active
- Diurnal
- Lives
- Saxicolous
Longer than 96% of all species in Liolaemidae 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 49.7 to 120 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
37 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
- Conservation status
- Least Concern
- Status assessed · the year the Red List last looked
- 2014
- Population trend
- Stable
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 35.7°C
- Body temp in the wild · mean, when active
- 30.5°C
body temperature of active animals in nature
Size
- Length snout to vent · greatest recorded
- 109mm4.25 in
- Length snout to vent · adult female mean
- 97.3mm3.75 in
- Hatchling length · snout to vent
- 59mm2.25 in
- Body mass · greatestcomputed
- 53.75g1.9 oz
- Body mass · adult female, meanmeasured
- 18.72g0.66 oz
Shai Meiri, unpublished
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Herbivorous
- Active
- Diurnal
- Where it lives
- Saxicolous
- Habitat
- Rocky
- Biome
- Montane Grasslands & Savannas
- Active season · months of the year
- 6months
- Region
- Neotropic
- Mainland or island
- Mainland
- Elevation · above sea level
- 2870–3000m
- Range size
- 571km²
e.g., Castro et al. 2018, Ibarguengoytia et al. 2021
2878 (Castro et al. 2018), 3000 (Ibarguengoytia et al. 2021)
Breeding
- Reproduction
- Viviparous
- Sex decided by
- Genes, XX/XY
- Average clutch
- 1.9eggs
- Eggs or young per clutch
- 1–2eggs
- Mean clutch
- 1.9eggs
- Clutches a year
- 0.5per year
1-2, mean 1.9 (Castro et al. 2018, Castro 2019), 2 (Erostarbe and Acosta 2020; n=1)
Naming and history
- Suborder
- Sauria
- Infraorder
- Pleurodonta
- Subspecies
- No
- Described by
- Lobo, Laspiur, Acosta
- Moved to another genus · since it was first described
- No
- Described in
- 2013
- Type locality
- Argentina
Keeping one
17 in × 17 in × 10.5 in(44 × 44 × 27 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.
Lives on rock, so stable hard surfaces and basking ledges suit it.
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 4.25 in (109 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 96 °F (35.7 °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
Prey size does not apply. A herbivore's diet is judged on fibre, on the ratio of calcium to phosphorus, and on avoiding plants high in oxalates.
The animal does not take prey items. This is established practice, not a measurement.
7kJ per day
Worked out for an animal of 54 g, the heaviest recorded for Calingasta Chuckwalla — 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 female · snout to vent
- — Largest male · snout to vent
- — Largest female · shell length
- — Largest male · shell length
- — 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 at hatching
- — Longest recorded life
- — Body temperature when active · measured in the wild
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — How the young develop
- — Gestation or incubation
- — Clutches in a year
- — 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
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Liolaemidae
- Agua Negra Chuckwalla
- Agueda’s Rocky Lizard
- Aluminé River Smooth-throated Lizard
- Andes Tree Iguana
- Antofagasta Chuckwalla
- Antonieta’s lizard
- Antuco Chuckwalla
- Arambaré Smooth-throated Lizard
- Auca Mahuida Volcano Chuckwalla
- Austral Smooth-throated lizard
- Austromendocino Tree Iguana
- Awsanqati Smooth-throated Lizard
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). Phymaturus williamsi. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/phymaturus-williamsi
@misc{phymaturus_williamsi_2026,
title = {Phymaturus williamsi},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/phymaturus-williamsi}
}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.