
Source: Wikimedia Commons
Malaclemys terrapin
An emydid turtle confined to the brackish coasts of eastern North America. Its English name comes from the concentric growth rings on the carapace scutes, which resemble the facets of a diamond. Lachrymal salt glands allow it to live in sea water.
Malaclemys terrapin is an emydid turtle of the brackish coastal waters of eastern and Gulf-coast North America and the only member of its genus. Uniquely among North American turtles it lives only in saline habitats such as salt marshes, tidal flats and estuaries, and enlarged lachrymal salt glands let it survive long periods in full-strength sea water. The skin is greyish white to pale grey with black spots and streaks, and the top of the head is covered with large spindle-shaped scales. The concentric growth rings on the carapace scutes give the animal its English name. Seven subspecies are recognised, differing in carapace shape, keel development and the colour of skin and beak. The sexes differ markedly: females have much larger jaws and crush molluscs powerfully. The species was severely depleted by harvesting for food in the early twentieth century.
Source: Wikipedia (CC BY-SA 4.0)
The Diamondback Terrapin lives Up to 40 years in captivity; about 25 years is the estimate for wild animals.
The Diamondback Terrapin grows to Carapace up to 23.8cm; males up to 15.3cm.
Origin
The Atlantic and Gulf coasts of the United States from Massachusetts to Texas, and Bermuda, in salt marshes, tidal flats, inlets and estuaries
Lifespan
Up to 40 years in captivity; about 25 years is the estimate for wild animals
Size
Sources: Reptiles Magazine: Diamondback Terrapin Natural History and Captive Care / Wikipedia (Japanese): Diamondback terrapin / Wikipedia (English): Diamondback terrapin / Reptile Database
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
Accepted name: Malaclemys terrapin (Schoepff, 1793)
Synonyms: Testudo terrapin Schoepff, 1793, Emys macrocephala Gray, 1844, Malacoclemmys terrapin (Cope, 1875)
Authority databases: Reptile Database
Nomenclature follows global taxonomic authority databases.
Listed in CITES Appendix II effective June 12, 2013. As an Appendix II species, no CITES registration certificate for internationally rare wild fauna and flora is required. It does not fall under the designated animals listed in the Ordinance for the Enforcement of the Law Concerning the Protection and Management of Animals, nor is it designated as a specified alien species.
Sources: CITES Appendices / Ministry of the Environment: list of invasive alien species / Order for Enforcement of the Act on Welfare and Management of Animals (designated dangerous animals)
Regulations may change. Always verify the latest information with the relevant authorities.
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Carapace up to 23.8cm; males up to 15.3cm
Humidity
40〜70%
Aquatic turtle pellets, snails and bivalves, crustaceans and small fish
Aim for a water temperature of 24-26 C, using a submersible tube heater for hatchlings, and hold the basking site at 29-30 C. Indoors, add full-spectrum UVB lighting.
Hatchlings can be raised together in a container with 7-10 cm of water, but they grow fast, so plan to upgrade early. A single adult female or two adult males need roughly 150 litres. Provide strong circulating filtration and a basking platform. The species is adapted to brackish water but tolerates fresh water in captivity.
In the wild it feeds on periwinkles and other snails in the salt marsh. In captivity, base the diet on aquatic turtle pellets with snails, crustaceans and small fish alongside. It crushes shells, so supply plenty of calcium.
It is wary: in the wild a basking terrapin drops into the water at the sight of a person. Captive animals are often nervous too, but they are not prone to biting.
Listed on CITES Appendix II with effect from 12 June 2013; as an Appendix II species it needs no individual registration certificate in Japan, and it is neither a designated dangerous animal nor an invasive alien species there. US states regulate collection, and bycatch in crab traps and road mortality are the main conservation problems.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The average lifespan of Diamondback Terrapin is Up to 40 years in captivity; about 25 years is the estimate for wild animals. With proper care and nutrition, they can live a long and healthy life.
Diamondback Terrapin typically reaches Carapace up to 23.8cm; males up to 15.3cm as an adult. Size may vary depending on care conditions and individual genetics.
Diamondback Terrapin feeds on: Aquatic turtle pellets, snails and bivalves, crustaceans and small fish. Aim for a balanced diet with appropriate feeding frequency.
The price of Diamondback Terrapin varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 16, 2026