Spiny turtle (Heosemys spinosa)

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Spiny turtle fact file

Spiny turtle description

KingdomAnimalia
PhylumChordata
ClassReptilia
OrderTestudines
FamilyBataguridae
GenusHeosemys (1)

The origin of its common and specific name is immediately apparent from the sharp, pointed, spiky-edged carapace, and spiny keel, of this unique turtle, also known as the ‘cog-wheel turtle’. There are also smaller spines on the pleural scutes, creating the effect of a walking pin cushion (4). It is thought that this spiny ‘armour’ acts as a deterrent to predators, such as snakes (5). However, this unmistakable, strongly-serrated carapace edge and spiny keel become worn down and are lost with age, so that larger individuals are much smoother than juveniles (6) (7). The carapace is brown with a pale streak down the central keel, and the head and limbs are greyish-brown, usually with a yellow to red spot behind the eye and similar-coloured speckling on the legs (4) (5). This cryptic colouration helps camouflage the turtle amongst the leaf litter of its forest floor habitat (6). The plastron is buff coloured with an intricate pattern of dark radiating lines on each scute (4) (7).

Also known as
cog-wheel turtle, Spiny hill turtle, spiny terrapin, sunburst turtle.
Synonyms
Emys spinosa, Geoemyda spinosa.
Size
Carapace length: 175 - 220 mm (2)
Weight
1.5 – 2 kg (2)
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Spiny turtle biology

The spiny turtle has not thrived in captivity and relatively little is known of its breeding habits (8). Mating behaviour is apparently stimulated by rains, with males becoming excited when sprayed with water in captivity, chasing females in an attempt to mount. Nesting behaviour is unknown in the wild, but generally one or two eggs are laid per clutch (clutches containing three eggs have been recorded) in captivity, usually at night or in the early morning (7). Up to three clutches have been produced a year (7), and to enable the passage of these relatively large eggs, a hinge develops in the female’s plastron to allow greater flexibility during egg-laying (5). There have only ever been a handful of successful captive breeding efforts of the spiny turtle, and those that have been successful have had incubation periods of 106 days (2), 110 days (9) and 145 days (10).

The spiny turtle is apparently herbivorous in the wild, preferring fruits and vegetables, but will accept some animal foods in captivity (5) (7).

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Spiny turtle range

The spiny turtle ranges throughout Southeast Asia, from Thailand and possibly southern Myanmar southward through Malaysia to Sumatra, Borneo and Natuna, numerous small Indonesian Islands and the Philippines (1) (7).

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Spiny turtle habitat

This semi-aquatic species is found in shallow, wooded mountain streams, but spends considerably time on land foraging or burrowing amongst the leaf litter of the forest floor (4). At least in captivity, juveniles appear to be more terrestrial than adults (7).

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Spiny turtle status

Classified as Endangered (EN) on the IUCN Red List 2006 (1) and listed on Appendix II of CITES (3).

IUCN Red List species status – Endangered

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Spiny turtle threats

Like most Asian turtle species, the spiny turtle is in grave danger of extinction due to over-collection from the wild for the Asian food market and international pet trade, as well as being threatened by the destruction of its habitat (11). Wild populations are thought to be plummeting, particularly in Indonesia, where they are considered Critically Endangered and known trade volumes have recently declined by about 50 %. Elsewhere, the species is restricted to small and isolated populations over much of its range (1). When they reach the West and enter the pet market, imported Asian turtles are often parasite ridden and mortality is relatively high (4) (8). Many have also had to endure poor and incredibly stressful conditions in food markets, and are dehydrated and malnourished from their long journeys from the Asian food markets to the Western pet trade (8). Unfortunately, the extreme difficulty in breeding this species in captivity means that all specimens found in pet stores today are still caught from the wild and freshly imported from Asia.

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Spiny turtle conservation

Like many other species, the spiny turtle would benefit from captive breeding programmes or ‘turtle farms’ to supply the food and pet market, and thereby mitigate the demand to remove large numbers from the wild (4). Unfortunately, this species is notoriously difficult to breed in captivity and only a handful of institutions have ever successfully bred the species, including Zoo Atlanta and Knoxville Zoo in the US., and Durell Wildlife in Jersey, Europe (9) (11). Nevertheless, these few successes provide fresh hope that a captive breeding programme might one day be able to haul the species back from the brink of extinction (12). It is also hoped that these successful reproductive attempts will help provide more information about the biology and ecology of this beautiful yet complex species, information that can prove invaluable for conservation action in the wild (11) (12).

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

For more information on the spiny turtle see:

For more information on the captive breeding and conservation of the spiny turtle see:

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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

Carapace
In reptiles, the top shell of a turtle or tortoise.
Herbivorous
Diet comprises only vegetable matter.
Keel
A projecting ridge along a flat or curved surface, particularly down the middle.
Plastron
In reptiles, the lower shell of a turtle or tortoise.
Pleural scute
Four lateral-most scutes (see scute) covering both sides of the upper shell of a turtle or tortoise, between the vertebral (central) and marginal scutes. These scutes are also called "laterals".
Scute
One of the large keratinous scales on the carapace (the top shell of a turtle or tortoise).
Terrestrial
Land dwelling; living on the ground.
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References

  1. IUCN Red List (May, 2006)
    http://www.redlist.org
  2. The Tortoise Reserve (June, 2006)
    http://www.tortoisereserve.org/About/Asian_Turt_Body2.html
  3. CITES (May, 2006)
    http://www.cites.org
  4. The Turtle Puddle (June, 2006)
    http://www.turtlepuddle.org/exotics/H_spinosa.html
  5. Asean Review of Biodiversity and Environmental Conservation (ARBEC): Crocodiles and Turtles of Borneo (June, 2006)
    http://www.arbec.com.my/crocodilesturtles/bataguridae/bataguridae_4.php
  6. Ecology Asia (June, 2006)
    http://www.ecologyasia.com/verts/turtles/spiny_terrapin.htm
  7. Turtles of the World (CD-ROM), by Ernst, C.H., Altenburg, R.G.M. and Barbour, R.W. (June, 2006)
    http://nlbif.eti.uva.nl/bis/turtles.php?selected=beschrijving&menuentry=soorten&id=288
  8. The Asian Turtle Consortium (June, 2006)
    http://www.asianturtle.org/htm/species_Heosemys_spinosa.html
  9. Tryan, B.W. (2004) The Spiny Hill Turtle…redefining cute and cuddly. Wild Wonders (A Publication for Knoxville Zoo Members and Supporters), 0: 9 - . Available at:
    http://www.knoxville-zoo.org/documents/wildwonders1004.pdf
  10. EAZA Shellshock Campaign (June, 2006)
    http://www.eaza.net/turtle/download/EN49_p6_10.pdf
  11. Durell Wildlife (June, 2006)
    http://www.durrellwildlife.org/index.cfm?p=330
  12. BBC News: Baby turtle gives species hope (June, 2006)
    http://news.bbc.co.uk/1/hi/sci/tech/4099857.stm
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Image credit

Spiny turtle exiting water  
Spiny turtle exiting water

© Zig Leszczynski / Animals Animals

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