Reptilia · Squamata
Acanthodactylus haasiLeviton & Anderson, 1967
Haas’s Fringe-toed Lizard
Identification not confirmed. One observer recorded this animal as this species and no one has since agreed, so the photograph may show a different animal.
Photograph by purperlibel, CC BY-SA, via iNaturalist
A day-active, meat-eating lizard from the Saharo-Sindian region, reaching 65 mm snout to vent.
Also called Haas' Fringe-fingered Lizard.
Reptilia › Squamata › Lacertidae › Acanthodactylus
- Grows to
- 65mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Diurnal
- Lives
- Arboreal, terrestrial
Longer than only 38% of all species in Lacertidae 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 35 to 444 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
24 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
- 2012
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
Size
- Length snout to vent · greatest recorded
- 65mm2.5 in
- Body mass · greatestcomputed
- 6.41g0.23 oz
max 65 mm (Gardner 2013, Carranza et al. 2021)
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Carnivorous
- Active
- Diurnal
- Where it lives
- Arboreal, terrestrial
- Habitat
- Desert, Shrubland
- Biome
- Deserts & Xeric Shrublands
- Region
- Saharo-Sindian
- Mainland or island
- Mainland
- Elevation · above sea level
- 100–400m
- Range size
- 513,824km²
insects (Gardner 2013), arthropods (Carranza et al. 2021)
e.g., Carranza et al. 2021
Arboreal (Leviton et al. 1992, Vanhooydonck and Van Damme 1999, Arnold 1998)/terrestrial (Gardner 2013)/"ground-dwelling lizard, found on vegetated sandy plains and sand dunes. It runs with the body held high and the tail curved upwards to avoid the heat of the sand. It spends most of the time inside small bushes where it climbs with agility hunting insects and other arthropods" (Carranza et al. 2021)
100-400 (Carranza et al. 2021)
Naming and history
- Suborder
- Sauria
- Infraorder
- Laterata
- Subspecies
- No
- Described by
- Leviton & Anderson
- Moved to another genus · since it was first described
- No
- Described in
- 1967
- Type locality
- Saudi Arabia
Keeping one
10 in × 10 in × 10 in(26 × 26 × 26 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes ground species at 4 × 4 × 2.5 and climbing species at 4 × 2.5 × 4 times snout-vent length.
Recorded both on the ground and climbing, so this is the larger of the two rules in every dimension.
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 2.5 in (65 mm), at 4 × 4 × 4 times it, following the German federal welfare standard — how this is worked out.
No preferred body temperature has been recorded for Haas’s Fringe-toed Lizard. Rather than repeat a number from a care sheet, this page leaves it out.
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.
1kJ per day
Worked out for an animal of 6 g, the heaviest recorded for Haas’s Fringe-toed 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 female mean
- — 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 · 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
- — Preferred body temperature · chosen in a laboratory gradient
- — Body temperature when active · measured in the wild
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — Reproduction
- — 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
- — Red List criteria
- — Active season · shortest recorded
- — Active season · longest recorded
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Lacertidae
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). Acanthodactylus haasi. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/acanthodactylus-haasi
@misc{acanthodactylus_haasi_2026,
title = {Acanthodactylus haasi},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/acanthodactylus-haasi}
}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.