Reptilia · Squamata
Vanzosaura rubricaudaBoulenger, 1902
Red-tailed vanzosaur
Photograph by Tomás Carranza Perales, CC BY, via iNaturalist
A day-active, meat-eating lizard from the Neotropic region, reaching 45 mm snout to vent.
Once published as Gymnophthalmus multiscutatus, Gymnophthalmus rubricauda — those names reach this page.
Reptilia › Squamata › Gymnophthalmidae › Vanzosaura
- Grows to
- 45mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Diurnal
- Lives
- Fossorial, terrestrial
Longer than only 16% of all species in Gymnophthalmidae 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 28 to 121 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
36 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
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
- Preferred body temperature · chosen in a laboratory gradientmeasured
- 36.5°C
Size
- Length snout to vent · greatest recorded
- 45mm1.75 in
- Length snout to vent · adult female mean
- 34.7mm1.25 in
- Largest female · snout to vent
- 34.7mm1.25 in
- Hatchling length · snout to vent
- 16.17mm0.6 in
- Largest juvenile · snout to vent
- 16.2mm0.6 in
- Body mass · greatestcomputed
- 1.91g0.07 oz
max 45 mm SVL (Feldman et al. 2016)
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
- Carnivorous
- How it hunts
- Active foraging
- Active
- Diurnal
- Where it lives
- Fossorial, terrestrial
- Habitat
- Savanna
- Biome
- Tropical & Subtropical Grasslands, Savannas & Shrublands
- Active season · months of the year
- 12months
- Region
- Neotropic
- Mainland or island
- Mainland
- Elevation · above sea level
- 100–110m
- Range size
- 5,109,624km²
Arthropods (see "Sources (general)")
e.g., Recoder et al. 2014, Mesquita et al. 2016, Fenker et al. 2020
e.g., Bars-Closel et al. 2018; heliophylic, Recoder et al. 2014, Fenker et al. 2020
Leaf Litter and Terrestrial, and fossorial (Rodrigues 1996), terrestrial (Mesquita et al. 2016, Bars-Closel et al. 2018), semi fossorial (Fenker et al. 2020)
103 (Moreira et al. 2022)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 1.98eggs
- Eggs or young per clutch
- 1–3eggs
- Mean clutch
- 1.71–2.25eggs
- Clutches a year
- 2per year
means 1.714-2.25 (Mesquita et al. 2016), 2 (Fenker et al. 2020)
Naming and history
- Suborder
- Sauria
- Infraorder
- Laterata
- Subspecies
- No
- Described by
- Boulenger
- Moved to another genus · since it was first described
- Yes
- Described in
- 1902
- Type locality
- Argentina
Keeping one
7 in × 7 in × 4.5 in(18 × 18 × 11 cm)
Minimum length × width × height, for one animal. Bigger is always better. Substrate at least 0.9 in (2 cm) deep.
The standard sizes ground-dwelling species at 4 × 4 × 2.5 times snout-vent length.
Burrows, so substrate deep enough to dig in matters as much as floor area.
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 1.75 in (45 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 98 °F (36.5 °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
A prey item should be no wider than the space between the animal's eyes.
Widely used across reptile husbandry references. The stated reason is that the gap approximates the width of the throat, so wider prey is associated with impaction. This is established practice, not a measurement.
0kJ per day
Worked out for an animal of 2 g, the heaviest recorded for Red-tailed vanzosaur — 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 · nose to tail
- — 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 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
- — 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
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Gymnophthalmidae
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). Vanzosaura rubricauda. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/vanzosaura-rubricauda
@misc{vanzosaura_rubricauda_2026,
title = {Vanzosaura rubricauda},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/vanzosaura-rubricauda}
}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.