Reptilia · Testudines
Terrapene coahuilaSchmidt & Owens, 1944
Coahuilan box turtle
Photograph by J. Carlos Fonseca Mata, CC BY, via iNaturalist
A water-living, dawn-and-dusk, omnivorous turtle from the Nearctic region, reaching 168 mm nose to tail.
Reptilia › Testudines › Emydidae › Terrapene
- Grows to
- 168mm
- greatest recorded
- Eats
- Omnivorous
- Active
- Crepuscular
- Lives up to
- 138years
Longer than only 14% of all species in Emydidae 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 115 to 600 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
27 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
- Conservation status
- Endangered
- Population trend
- Decreasing
The animal itself
- Colour on the back
- Brown
- Pattern on the back
- Uniform
- Pupil
- Round
- Venomous
- No
- Fangs
- None
- Longest recorded life
- 138years
Size
- Length nose to tail · greatest recorded
- 168mm6.5 in
- Body mass · greatestcomputed
- 681g1.5 lb
- Body mass · a typical adult
- 259.8g9.2 oz
- Body mass at hatching
- 5.68g0.2 oz
total length, tail included — Colston, Kulkarni, Jetz, and Pyron, 2020, BMC Evol. Biol., 20:81
largely converted from length by allometry in the source
AnAge rates this record "acceptable"
How it lives
- Diet
- Omnivorous
- How it hunts
- Active foraging
- Active
- Crepuscular
- Where it lives
- Aquatic
- Habitat
- Wetlands
- Region
- Nearctic
Invertebrates, plants
Breeding
- Reproduction
- Oviparous
- Sex decided by
- Temperature
- Average clutch
- 3.8eggs
- Eggs or young per clutch
- 2–3eggs
- Clutches in a year
- 1per year
Naming and history
- Subspecies
- No
- Described by
- Schmidt & Owens
- Moved to another genus · since it was first described
- No
- Described in
- 1944
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.
65kJ per day
Worked out for an animal of 681 g, the heaviest recorded for Coahuilan box turtle — 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.
- — Still living
- — Length snout to vent · greatest recorded
- — Length snout to vent · adult female mean
- — Length snout to vent · adult male mean
- — Length snout to vent · adult mean
- — Female length · mean, nose to tail
- — Length nose to tail · adult male mean
- — Length nose to tail · adult mean
- — Shell length, front to back · greatest recorded
- — 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 · adult female, mean
- — Preferred body temperature · chosen in a laboratory gradient
- — Body temperature when active · measured in the wild
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How the young develop
- — Gestation or incubation
- — Mean clutch · smallest reported
- — Mean clutch · largest reported
- — 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
- — Limbs
- — Status assessed · the year the Red List last looked
- — Red List criteria
- — Biome
- — Active season · shortest recorded
- — Active season · longest recorded
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Suborder
- — Infraorder
- — Type locality
- — Active in
- — Mainland or island
- — Lowest it lives · above sea level
- — Highest it lives · above sea level
- — Range size
Others in Emydidae
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). Terrapene coahuila. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/terrapene-coahuila
@misc{terrapene_coahuila_2026,
title = {Terrapene coahuila},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/terrapene-coahuila}
}Sources
- 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.
- Moura, M. R. et al. TetrapodTraits: a database of 33,281 tetrapod species. Used under CC BY 4.0. Observed values only; this encyclopedia does not publish its imputed predictions.
- AnAge, Human Ageing Genomic Resources (de Magalhães et al.), used under CC BY 3.0.