Reptilia · Squamata
Cachryx defensorCope, 1866
Yucatán Spinytail Iguana
Photograph placed in the public domain, CC0, via iNaturalist
A day-active, plant-eating lizard from the Neotropic region, reaching 155 mm snout to vent.
Once published as Ctenosaura defensor — those names reach this page.
Reptilia › Squamata › Iguanidae › Cachryx
- Grows to
- 155mm
- greatest recorded
- Eats
- Herbivorous
- Active
- Diurnal
- Lives
- Arboreal, saxicolous, terrestrial
Longer than only 7% of all iguanas 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 129 to 750 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
28 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
- 2004
- Red List criteria
- A3cd; B1ab(iii,v)+2ab(iii,v)
The animal itself
- Limbs
- Four legs
- Venomous
- No
- Fangs
- None
Size
- Length snout to vent · greatest recorded
- 155mm6 in
- Hatchling length · snout to vent
- 37mm1.5 in
- Body mass · greatestcomputed
- 162.8g5.7 oz
max 155 mm SVL (Feldman et al. 2016)
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Herbivorous
- Active
- Diurnal
- Where it lives
- Arboreal, saxicolous, terrestrial
- Biome
- Tropical & Subtropical Dry Broadleaf Forests
- Region
- Neotropic
- Mainland or island
- Mainland
- Highest it lives · above sea level
- 100m
- Range size
- 45,690km²
e.g., Heimes 2022
Arboreal / Terrestrial and Saxicolous (Kohler 2003, Flores-Villela and Rubio-Perez 2008) / arboreal, one saxicolous or terrestrial population (Heimes 2022)
5 (Ortiz-Medina et al. 2021)
Breeding
- Reproduction
- Oviparous
- Average clutch
- 5eggs
- Eggs or young per clutch
- 2–8eggs
2-3 (Flores-Villela and Rubio-Perez 2008, Sheetz et al. 2007), 2-3 but occasionally up to 8 (Heimes 2022), 2-8 (Langner et al. 2022)
Naming and history
- Suborder
- Sauria
- Infraorder
- Pleurodonta
- Subspecies
- No
- Described by
- Cope
- Moved to another genus · since it was first described
- No
- Described in
- 1866
- Type locality
- Mexico
Keeping one
Yucatán Spinytail Iguana 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.
2 ft × 2 ft × 2 ft(62 × 62 × 62 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.
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 6 in (155 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 Yucatán Spinytail Iguana. Rather than repeat a number from a care sheet, this page leaves it out.
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.
18kJ per day
Worked out for an animal of 163 g, the heaviest recorded for Yucatán Spinytail Iguana — 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 · 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
- — How the young develop
- — Gestation or incubation
- — 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
- — Habitat
- — Active in
- — Lowest it lives · above sea level
Others in Iguanidae
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). Cachryx defensor. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/cachryx-defensor
@misc{cachryx_defensor_2026,
title = {Cachryx defensor},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/cachryx-defensor}
}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.