River Terrapin
Post-nesting female river terrapin photographed by the nesting bank, Tebing Pasir Penarik in Setiu. Photo credit: P.N. Chen

Post-nesting female river terrapin photographed by the nesting bank, Tebing Pasir Penarik in Setiu. Photo credit: P.N. Chen.

A male river terrapin during the nesting season. Photo credit: P.N. Chen.

A male river terrapin during the nesting season. Photo credit: P.N. Chen.

River terrapin hatchlings photographed in Setiu. Photo credit: E.H. Chan.

River terrapin hatchlings photographed in Setiu. Photo credit: E.H. Chan.

Common name: River terrapin
Scientific name: Batagur affinis
Local Malaysian name: Tuntung sungai

Conservation status: Listed as critically endangered in the 2009 IUCN Red List and in CITES Appendix I

Adult female shell length: 47 – 60 cm
Adult female body weight: 15 – 35 kg

Food: Adults are mainly herbivorous, feeding on mangrove apple (Sonneratia sp.), sedges (Scleria sp.), screw pine (Pandanus sp.), Colocasia (Ficus sp.) and water hyacinth (Eichornia crassipes)

Range: Tidal portions of major rivers in southern Thailand, Cambodia, Peninsuar Malaysia

Nesting sites in Malaysia: Terengganu (Terengganu, Dungun, Besut, Setiu-Chalok, Kerteh, Kemaman rivers), Kedah river systems, Perak river systems and Pahang river systems

Characteristics: Upturned snout, four front claws

Sexual dimorphism: Adult males are smaller than adult females. During the nesting season, the male’s head, neck and feet turn jet black and the iris changes from creamish to white in colour

Nesting season: Mid-January – mid-March

Number of nests deposited per individual per season: Typically one nest, with very few depositing two, three and four nests

Inter-nesting interval (interval between each nesting): P. N. Chen who monitored nesting activity in Pasir Pok Yok in the Kemaman River from 2011 to 2015 found females re-nesting between one and 11 days. Mean inter-nesting interval is 3.5 days.

Number of eggs per nest: Range of 9 – 39, average of 25

Incubation duration: Between 60 – 92 days for in-situ nests

Hatchling shell length: 5.2 – 8.4 cm
Hatchling body weight: 60 – 89 g