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Coahuilan Box Turtle Facts (Aquatic Box Turtle)

The Coahuilan box turtle is also known as the aquatic box turtle. This is a perfect description, as unlike other box turtle species, Coahuilan box turtles spend over 90% of their lives in the water.

Of all the box turtles, this is the only aquatic species. One mystery about these turtles is their lifespan – it’s unknown.

Coahuilan Box Turtle Facts and Information

The Coahuilan box turtle is native to Coahuila in Mexico, hence their name. It’s scientific name is Terrapene coahuila. This particular species is endangered and is rarely found anywhere other than Cuatro Ciénegas in Coahuila, Mexico.

You may stumble upon pockets of these turtles within 800 sq. km of Coahuila, but due to their small population, which is estimated to be around 2500, there are strict laws in place to protect this species.

The Coahuilan box turtle belongs to the box turtle (Terrapene) genus and the Emydidae family. Unlike other box turtles, this peculiar species is perfectly adapted to spend most of its time in water. Like eastern box turtles and others, their shells are hinged and can hide their entire body if necessary.

In terms of appearance, this species’ skin color ranges from brown to deep gray and to black. It’s not normal to find algae growing on their shell. Adults are usually between 3 to 6 inches in size.

While the exact lifespan of this species is unknown, it is estimated that in the wild, they can live over 65 years.

Coahuilan Box Turtle Diet

In the wild, the Coahuilan box turtles are opportunistic feeders and eat what they find. They feed on crayfish, fish, reptiles, true bugs, beetles, dragonfly nymphs, fly larvae, and plant matter, mostly spike rush.

While an adult aquatic box turtle can be fed every 2 to 3 days, young Coahuilan box turtles need to be fed every other day. Make sure to feed equal portions of vegetables and proteins. They are not picky eaters and eat whatever you feed them.

Good sources of protein are earthworms, sow bugs, tree bugs, grubs, slugs, beef heart, feeder fish, wax worms, crickets, snails, natural prawns, shrimps and many more.

Vegetables that you can feed them include spinach, romaine lettuce, and spike rush (Eleocharis). They also eat other leafy greens. In addition to the veggies, they eat fruits like sliced bananas, and strawberries when given to them. Supplementing their diet with fruits ensures they get all the needed vitamins and minerals for healthy growth.

Also, formula box turtle food like Rep-Cal Maintenance Formula Box Turtle Food with Fruit can provide the needed nourishment. Even if you decide to feed your Coahuilan box turtle formula food, it is always advised to supplement this with natural foods.

Coahuilan Box Turtle Habitat

Coahuilan Box Turtle

In the wild, which is Coahuila, these turtles spend almost all their time in water, swimming in tall grass and brushes of marshland. They prefer shallow water with dense vegetation.

Since they spend about 90% of their lives in water, the artificial set up that houses them should have enough water for them to swim in. An enclosure that holds 75 gallons to 100 gallons of water should suffice.

You also need to place plants in the aquarium. Plants such as the water hyacinth, and Eleocharis (spike rush) are excellent choices. Since these species feed on plants, you need to replace the plants from time to time.

Edible aquatic plants can usually be purchased cheaply and aren’t a hard to replace. In addition to an abundance of plants, the aquarium also needs a log; this serves as a good hiding spot.

An aquarium pump and filtration set up is necessary to ensure that the water is clean at all time. A TetraPond Submersible Flat Box Filter and Simple Deluxe Submersible Pump set up is one I recommend.

Providing a good light source is important as it enables turtles to synthesize vitamin D3. A good light source is one that provides the turtle with adequate amounts of UVB rays. For a natural light source, you can place the habitat by a window that gets a lot of sunlight. You can also acquire an artificial UVB light.

Finally yet most importantly, while this turtle is aquatic it still needs a terrestrial place to bask. While this area doesn’t need to be large, there should be enough space for the turtle to move about.

Coahuilan Box Turtle Breeding

The Coahuilan box turtle reaches sexual maturity around age 15. Mating season is usually from September to June. The adult female is capable of laying three clutches of eggs yearly, from May to September. 2-3 eggs make up each clutch.

Coahuilan Box Turtle Predation

Unsurprisingly little is known about animals that prey on this species. Species known to prey on aquatic box turtle include raccoons and coyotes.

Coahuilan Box Turtle Endangerment

Due to the loss of its natural habitat, the aquatic box turtle is endangered. The adult population of this species is estimated to be about 2,500. As such, there are laws that protect the wild aquatic box turtle.

If you plan on keeping this turtle as a pet, you have to check with the rules of your state and ensure that it’s legal. In many states, pet owners need permits to raise this turtle.


Due to their endangered status, acquiring an aquatic box turtle requires you to do your research. You need to find out if it’s legal to keep this turtle as a pet.

You may require a federal permit to keep this turtle. Due to their rarity, aquatic box turtles that make it onto the market are usually expensive. It is advisable to seek help from an experienced turtle breeder or a wildlife professional if you wish to care for this turtle.

Over to you now. Do you have one of these beauties? Are you considering it? Let me know in the comments below.

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Thursday 6th of August 2020

Hi, I have what I believe is a coahulian box turtle. I saw someone throwing what looked like a green rock in the garbage one day but realized it was a turtle. I took It home and cleaned it and it was a beautiful brown gold shell covered in algae. I’ve had him for 15 years now . Recently it stopped eating . I’ve tried giving him a different diet for two weeks it won’t even bite . Any suggestions, he’s strong, still active , sleeps on his rock at night and stays in the water all day. When I leave him out the tank he usually just finds a dark place to sleep. Any suggestions to motivate his appetite he’s never done this before ? Still very alert and active but not eating at all? Thanks


Wednesday 22nd of April 2020

I have found a turtle at my small ranch in the small town of Leauge city between Houston and Galveston Texas. I'm not sure if it is a Coahuilan box turtle but from the looks of it I believe it is. We have no intention of keeping it but we have no idea what to do with it either. I was thinking of putting it in my pound with the other turtles ( red ear slider snapping turtle) but I'm not sure I would love some feedback thanks.


Thursday 23rd of April 2020

Do you know what type of turtle it is? Do you think it is wild or someones escaped pet?

I would say if it is a water turtle, feel free to put it near the pond and let it choose what it wants to do.