Reptilia · Squamata
Phymaturus mallimacciiCei, 1980
Thorntail Mountain Lizard
Photograph by Valeria Corbalan, CC BY-SA, via iNaturalist
A rock-dwelling, day-active, plant-eating lizard from the Neotropic region, reaching 102 mm snout to vent.
Once published as Centrura mallimacci — those names reach this page.
Reptilia › Squamata › Liolaemidae › Phymaturus
- Grows to
- 101.9mm
- greatest recorded
- Eats
- Herbivorous
- Active
- Diurnal
- Lives
- Saxicolous
Longer than 86% 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
29 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
- Vulnerable
- Status assessed · the year the Red List last looked
- 2014
- Red List criteria
- D2
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 35.6°C
Size
- Length snout to vent · greatest recorded
- 101.9mm4 in
- Length snout to vent · adult female mean
- 95.3mm3.75 in
- Largest female · snout to vent
- 95.3mm3.75 in
- Body mass · greatestcomputed
- 42.93g1.5 oz
Shai Meiri, unpublished
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
- Diet
- Herbivorous
- Active
- Diurnal
- Where it lives
- Saxicolous
- Habitat
- Grassland
- Biome
- Montane Grasslands & Savannas
- Region
- Neotropic
- Mainland or island
- Mainland
- Elevation · above sea level
- 3800–5000m
- Range size
- 622km²
Cei 1986
Rodda 2020
Mariana Morando pers. comm. January 2019
Breeding
- Reproduction
- Viviparous
e.g., Mariana Morando pers. comm. January 2019
Naming and history
- Suborder
- Sauria
- Infraorder
- Pleurodonta
- Subspecies
- No
- Described by
- Cei
- Moved to another genus · since it was first described
- No
- Described in
- 1980
- Type locality
- Argentina
Keeping one
Thorntail Mountain Lizard is assessed as Vulnerable on the IUCN Red List. Species at risk in the wild are often covered by CITES and by national law, which decide what may be bought, sold, moved across a border or kept at all — and captive-bred and wild-caught animals are usually treated differently. Check the rules where you are before acquiring one. Nothing below is a judgement about keeping this species; it is what a published welfare standard says about space, and what the animal itself was measured doing.
16 in × 16 in × 10 in(41 × 41 × 26 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 in (101.9 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 (35.6 °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.
6kJ per day
Worked out for an animal of 43 g, the heaviest recorded for Thorntail Mountain 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
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — How the young develop
- — Gestation or incubation
- — Average clutch
- — 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
- — Body temp in the wild · lowest mean recorded
- — Body temp in the wild · highest mean recorded
- — Colour on the back
- — Pattern on the back
- — Pupil
- — Sex decided by
- — Population trend
- — Active season · shortest recorded
- — Active season · longest recorded
- — 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 mallimaccii. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/phymaturus-mallimaccii
@misc{phymaturus_mallimaccii_2026,
title = {Phymaturus mallimaccii},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/phymaturus-mallimaccii}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Catalogue of Life (dataset 3LR), used under CC BY.
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.