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what are scutes on a tortoise?

Irregular Scutes on Tortoises (5 Different Problems)

Last Updated on October 5, 2023 by Samantha Harris

A tortoise’s most iconic feature is its scutes. Aside from aesthetics, scutes are vital to a tortoise’s health and well-being. Unfortunately, different health ailments can adversely affect the scutes.

All tortoise species are vulnerable to shell issues when they’re young. Adjusting the temperature, humidity, diet, soaking time, supplements, or medication can be beneficial.

What Are Scutes On A Tortoise?

The scutes are the divisions, or sections, on a tortoise’s shell, shaped like a shield or a rounded square.

The shell of the tortoise is beneath the scutes. The scutes protect the shell, while the shell protects the bones and internal organs.

Scutes consist of keratin, allowing them to grow, shed, and protect the shell.

Tortoises also have scutes on the plastron (lower portion of the shell). The scutes in this area are much thinner than those on the carapace (the upper part of the shell).


When the scutes are damaged, a tortoise will have a more challenging time defending itself. Damage to the scutes can also lead to infection, which can cause complications in other areas of the body.

Health Indicator

Scutes are indicative of the health of the tortoise. For example, dry scutes signify dehydration, while uneven scutes can signify malnutrition.

Irregular scutes are usually the final symptom of an unhealthy tortoise.

Physical damage to the scutes is long-lasting and often irreversible. For this reason, they’re rarely helpful if you want to check the tortoise’s health status.

tortoise scutes falling off

How Many Scutes Does A Tortoise Have?

Tortoises usually have 38 scutes on the carapace and 12-14 scutes on the plastron. Some tortoises have extra scutes, which are split scutes caused by a dividing line, making 1 scute into 2.

All species will have different scute patterns and shell shapes, which is part of their diversity.

Common Scute Problems

Knowing the common problems scutes have and how to treat them is essential.

Tortoise Scutes Falling Off

Scutes falling off can be a natural process called shedding.

Normal shedding should be a regular occurrence, happening once every few months. You should see new, healthy scutes underneath the peeling ones.

Tortoises shouldn’t peel constantly. Check the area if you notice constant flaking on the scutes. The chances are that the tortoise was injured, infected, hit itself on a rock, or got parasites.

Treat this injury like any other wound by keeping it clean and checking for signs of infection. If the wound is large, consider applying a dressing.

Tortoise Scutes Separating

If the scutes are separating, you’re likely dealing with shell growth. The tortoise may be ill if the scutes separate from the shell.

Separating from Each Other

Look for a line or gap between the tortoise’s scutes, called a growth line. This is a normal part of shell growth. When the shell grows, the scutes will need to adjust to cover the new area of the shell.

The scutes will move farther away from each other, causing a growth line. Within this separation, new scutes will grow.

How do you know if separation is healthy or not? The best way to tell is the quality of the separation. Growth lines should be firm and range from yellow to white to tan.

Eventually, this color will match the color of the rest of the scutes as the keratin is exposed to sunlight.

For example, the new scutes will lighten with age in Russian tortoises, while scutes will darken in sulcatas. Tortoises grow slowly, so expect this change to occur over up to 2 years.

Growth lines are prone to injury because the spaces are thinner. They’re more vulnerable to being hit by hard objects and are more sensitive to hot temperatures.

You can apply tortoise-safe topical medication on the injury if damage occurs, like Neosporin.

Separating from The Shell

Scutes should never separate, even in shedding tortoises. Shedding only happens on the outer layers and shouldn’t affect how the scutes are attached to the shell.

Scutes will separate from the shell when the blood supply is cut off, which may be due to injury, infection, or disease. It can take a while for the scute to come away, as keratin will stay on top of the shell.

Scutes separating from the shell can indicate Metabolic Bone Disease. (MBD). This occurs when the body has too little calcium or excessive phosphorus.

If your tortoise has lost a scute, check to see if the bulbs emit UVB, as not all bulbs do. Replace all UV bulbs after 6 months, as the amount of light they emit after 6 months is insufficient.

Ensure the wattage and distance of the bulbs are correct. Likewise, avoid feeding the tortoise phosphorus-rich food and prioritize food high in calcium.

As long as the problem is addressed, the scute will regrow. Monitor the exposed area, as this will be prone to injury and infection.

Flared Scutes

Flared scutes refer to those that curl outward or upward from the edge. You’ll see this on the marginal scutes or the lowest layer of scutes on the carapace.

In most cases, flared scutes are nothing to be concerned about. Flares are expected in many species, particularly in one sex over the other.

The most prominent example of flared scutes is the testudo marginata, which can have extreme flares. In some testudos, this might even look like a skirt.

If the tortoise doesn’t have flares, this can indicate poor shell growth. Ensure the tortoise is fed a healthy diet and its habitat has the right conditions.

Flared scutes can’t be fixed or reversed. Most flares shouldn’t interfere with a tortoise’s quality of life. As long as the cause is addressed, the tortoise should return to a healthy life.

tortoise scutes separating

Pyramiding Scutes On Tortoises

Pyramiding refers to the scutes growing upward, creating a triangular shape.

The tips of the pyramid may be rounded or pointed. Some scutes may cause taller pyramids than others, but pyramiding still affects all the scutes.

This abnormal growth often happens in the first 2 years of a tortoise’s life. New scutes grow horizontally so they can cater to a bigger shell. When the scutes grow vertically, it causes pyramiding.

There’s no one definite reason why pyramiding can happen.

According to Comparative Biochemistry and Physiology, pyramiding can be caused by a high-fiber diet. Also, the African Journal of Herpetology notes that a low calcium-phosphorus ratio can cause pyramiding.

Scutes that are pyramided can’t be fixed or reversed.

Extra Scutes On Tortoises

Extra scutes are often called split scutes because one scute is ‘split’ into two, creating two where there should be one. You’ll see this as a line separating the scute into two.

Theories suggest that split scutes are genetic, although some tortoises will be born with them even if their parents don’t have them.

Another common theory is that scutes split because of improper incubation. The eggs can hatch with a split scute if the temperature and humidity are too low.

Split scutes are almost always cosmetic and won’t harm the tortoise. Tortoises with split scutes are usually less expensive than others, and some owners consider them more unique.