Common box turtle (Terrapene carolina)

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Three toed box turtle, T. c. triunguis, head detail
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Common box turtle fact file

Common box turtle description

KingdomAnimalia
PhylumChordata
ClassReptilia
OrderTestudines
FamilyEmydidae
GenusTerrapene (1)

The common box turtle (Terrapene carolina) gets its common name from the structure of its shell which consists of a high domed carapace (upper shell), and large, hinged plastron (lower shell) which allows the turtle to close the shell, sealing its vulnerable head and limbs safely within an impregnable box (2). The carapace is brown, often adorned with a variable pattern of orange or yellow lines, spots, bars or blotches. The plastron is dark brown and may be uniformly coloured, or show darker blotches or smudges (4).

The common box turtle has a small to moderately sized head and a distinctive hooked upper jaw (4). The majority of adult male common box turtles have red irises, while those of the female are yellowish-brown. Males also differ from females by possessing shorter, stockier and more curved claws on their hind feet, and longer and thicker tails (4).

There are six living subspecies of the common box turtle, each differing slightly in appearance, namely in the colour and patterning of the carapace, and the possession of either three or four toes on each hind foot. The subspecies Terrapene carolina triunguis is particularly distinctive as most males have a bright red head (4).

Also known as
Eastern box turtle.
Synonyms
Cistudo major, Cistudo mexicana, Cistudo triunguis, Cistudo virginea, Cistudo yucatana, Emys kinosternoides, Emys schneideri, Monoclida kentukensis, Terrapene bauri, Terrapene goldmani, Terrapene maculata, Terrapene mexicana, Terrapene nebulosa, Terrapene yucatana, Testudo brevicaudata, Testudo carinata, Testudo carolina, Testudo clausa, Testudo incarcerata, Testudo virgulata.
French
Tortue-boîte de Caroline.
Size
Carapace length: 10 - 22 cm (2)
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Common box turtle biology

Common box turtles are predominantly terrestrial reptiles that are often seen early in the day, or after rain, when they emerge from the shelter of rotting leaves, logs, or a mammal burrow to forage. These turtles have an incredibly varied diet of animal and plant matter, including earthworms, slugs, insects, wild berries (2), and sometimes even animal carrion (4).

In the warmer summer months, common box turtles are more likely to be seen near the edges of swamps or marshlands (2), possibly in an effort to stay cool. If common box turtles do become too hot, (when their body temperature rises to around 32 degrees Celcois), they smear saliva over their legs and head; as the saliva evaporates it leaves them comfortably cooler. Similarly, the turtle may urinate on its hind limbs to cool the body parts it is unable to cover with saliva (5).

Courtship in the common box turtle, which usually takes place in spring, begins with a ‘circling, biting and shoving’ phase. These acts are carried out by the male on the female (4). Following some pushing and shell-biting, the male grips the back of the female’s shell with his hind feet to enable him to lean back, slightly beyond the vertical, and mate with the female (6). Remarkably, female common box turtles can store sperm for up to four years after mating (4), and thus do not need to mate each year (6).

In May, June or July, females normally lay a clutch of 1 to 11 eggs into a flask-shaped nest excavated in a patch of sandy or loamy soil. After 70 to 80 days of incubation, the eggs hatch, and the small hatchlings emerge from the nest in late summer. In the northern parts of its range, the common box turtle may enter hibernation in October or November. They burrow into loose soil, sand, vegetable matter, or mud at the bottom of streams and pools, or they may use a mammal burrow, and will remain in their chosen shelter until the cold winter has passed (4).

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Common box turtle range

The common box turtle occurs in the eastern United States and eastern Mexico, where it is distributed from Maine and Michigan to eastern Texas and south Florida, and south to the Mexican states of Yucatán and Quintana Roo (4).

T. c. mexicana (Mexican box turtle) and T. c. yucatana (Yucatán box turtle) occur in Mexico. The other four subspecies, T. c. carolina (eastern box turtle), T. c. major (Gulf Coast box turtle), T. c. bauri (Florida box turtle) and T. c. triunguis (three-toed box turtle)are found in the United States (4).

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Common box turtle habitat

The common box turtle inhabits open woodlands, marshy meadows, floodplains, scrub forest and brushy grasslands (2) (4).

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Common box turtle status

The common box turtle is classified as Vulnerable (VU) on the IUCN Red List (1), and listed on Appendix II of CITES (3).

IUCN Red List species status – Vulnerable

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Common box turtle threats

Although the common box turtle has a wide range and was once considered common, many populations are in decline as a result of a number of diverse threats. Agricultural and urban development is destroying this species habitat, while unantural fire regimes are degrading it (1). Development brings with it an additional threat in the form of increased infrastructure, as common box turtles are frequently killed on roads and highways. Collection for the international pet trade may also impact populations in some areas (4) (7). The life history characteristics of the common box turtle, (long lifespan and slow reproductive rate) (4), make it particularly vulnerable to such threats.

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Common box turtle conservation

The common box turtle is listed on Appendix II of the Convention on International Trade in Endangered Species (CITES), meaning that international trade in this species should be carefully monitored to ensure it is compatible with the species’ survival (3). In addition, many U.S. states now regulate or prohibit the taking of this species (4).

This species also occurs in a number of protected areas, some of which are large enough to protect populations from the threat of development, while it may also occur in the Sierra del Abra Tanchipa Biosphere Reserve, Mexico. Conservation recommendations for the common box turtle include establishing management practices during urban developments that are sympathic to this species, as well as further research into its life history and the monitoring of populations (1).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For further information on the box turtles and their conservation: 

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Carrion
The flesh of a dead animal.
Hibernation
A winter survival strategy in which the animal passes the winter in a resting state. This period of inactivity is characterised by specific biological and biochemical changes including lowered blood pressure and respiration rate. In reptiles, this is also known as brumation.
Incubation
The act of incubating eggs, that is, keeping them warm so that development is possible.
Subspecies
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
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References

  1. IUCN Red List (June, 2011)
    http://www.iucnredlist.org
  2. Capula, M. (1990) The Macdonald Encyclopedia of Amphibians and Reptiles. Macdonald and Co Ltd, London and Sydney.
  3. CITES (June, 2007)
    http://www.cites.org
  4. Ernst, C.H., Altenburg, R.G.M. and Barbour, R.W. (1997) Turtles of the World. ETI Information Systems Ltd, Netherlands. Available at:
    http://ip30.eti.uva.nl/BIS/turtles.php
  5. Alderton, D. (1988) Turtles and Tortoises of the World. Blandford Press, London.
  6. Halliday, T. and Adler, K. (2002) The New Encyclopedia of Reptiles and Amphibians. Oxford University Press, Oxford.
  7. NatureServe (March, 2008)
    http://www.natureserve.org
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Image credit

Three toed box turtle, T. c. triunguis, head detail  
Three toed box turtle, T. c. triunguis, head detail

© Daniel Heuclin / www.photoshot.com

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