Heosemys grandis

Giant Asian Pond Turtle Heosemys grandis
Giant Asian Pond Turtle in Cambodia (photo by Koulang Chey)

Michael Cota Giant Asian Pond Turtle Northeast Thailand Heosemys grandis
Giant Asian Pond Turtle in Northeast Thailand (photo by Michael Cota)

Giant Asian Pond Turtle Heosemys grandis
Giant Asian Pond Turtle in Khao Phra Thaew (khaophrathaew.org)

Giant Asian pond turtle (Heosemys grandis) Jeff Chapman Nakhon Nayok
Giant Asian Pond Turtle in Nakhon Nayok (photo by Jeff Chapman)

Giant Leaf Turtle Heosemys grandis
Giant Asian Pond Turtle in Cambodia (photo by Jodi Rowley)

Giant Asian pond turtle Heosemys grandis Richard Lee Singapore
Giant Asian Pond Turtle in Singapore (photo by Richard Lee)

zulkifli ishak malaysia giant asian pond turtle Michael Cota Giant Asian Pond Turtle Northeast Thailand Heosemys grandis
Giant Asian Pond Turtle in Malaysia (photo by Zulkifli Ishak)

Giant Asian Pond Turtle - (Heosemys grandis) Kimberly Colette Micallef 2
Giant Asian Pond Turtle (photo by Kimberly Colette Micallef)

Giant Asian Pond Turtle - (Heosemys grandis) Kimberly Colette Micallef
Head shot of Giant Asian Pond Turtle (photo by Kimberly Colette Micallef)

Giant Asian Pond Turtle (Heosemys grandis)
Giant Asian Pond Turtle in Vietnam (photo by Eduard Galoyan)

English name: Giant Asian Pond Turtle (aka “Giant Asian Pond Terrapin” or “Giant Leaf Turtle”)
Scientific name: Heosemys grandis
Thai name: Tao Wai

Description: Shell is up to 48cm long. One of the largest freshwater turtles in Southeast Asia, weighing up to 12 kilograms. Shell is brown to black with a light brown keel down the center and serrated edges along the back. Bottom of shell is yellow with black blotching and black lines radiating out from the blotches. Head is thick and grayish-green to brown with a network of orange markings. Jaws are cream. Feet are large and toes are webbed.

Similar Species: Yellow-headed Temple Turtle has yellow markings on the head rather than orange and adults lack the keel on the shell.

Habitat: Found in stagnant or slow-moving streams, rivers, lakes, swamps, and marshes. Leaves the water to forage from the surrounding land, often hiding under low vegetation.

Place in the ecosystem: Primarily feeds on plant matter, but will also eat aquatic insects, worms, and mollusks. Also eats fruit on land. Young Giant Asian Pond Turtles can be eaten by monitors and wading birds.

Danger to humans: Is not dangerous to humans.

Conservation status and threats: The Giant Asian Pond Turtle is hunted for its meat and for traditional Chinese medicine. It also faces habitat loss due to pollution and the draining of wetlands. It is considered vulnerable across its entire range by the IUCN Red List and is listed on CITES Appendix II.

Interesting facts: Giant Asian Pond Turtles can sometimes be seen in the ponds of Buddhist temples, along with many other turtle species. One reason for this is the practice of “merit release”, where turtles and other animals are released into the wild in order to “make merit”. Most of these turtles are part of the illegal wildlife trade. Sadly, many such turtles are released into inappropriate or overcrowded habitats (such as decorative park and temple ponds) and end up dying after a long period of starvation or overcompetition. Other released turtles spread diseases that they caught in captivity into wild populations, thereby killing many more turtles. More information on turtle release and merit-making can be found at the Buddhist Merit-making Turtle Release Checklist.

References:
Asian Turtle Conservation Network: Heosemys grandis
IUCN Red List: Heosemys grandis
Buddhist Merit-making Turtle Release Checklist
The Turtles of Thailand
A Photographic Guide to Snakes and Other Reptiles of Peninsular Malaysia, Singapore and Thailand
A Field Guide to the Reptiles of South-East Asia