This species was tentatively identified as Corbicula cf. noetlingi by Tan et al (2012). It is believed to be introduced, and has only been found at this locality to date. Corbicula tweediei was described by Prashad (1940) based on specimens from Perak in Peninsular Malaysia. These were collected by Michael W. F. Tweedie, then director of the Raffles Museum and after whom the species is named.

Irmengardia johnsoni is endemic to Singapore, and is found mainly in the shallow forest streams of the Central Nature Reserves. It hides among leaf-litter, and is omnivorous, feeding on vegetable matter and the occasional worm. Although it is said to have a generally peaceful temperament (Ng, 1990), the present observation shows that it can be quarrelsome when food has to be shared

Parathelphusa maculata is probably the most common and widespread of the freshwater crabs on Singapore Island. It is usually found in shallow forest and rural streams with clay banks and leaf litter (Ng, 1990: 192)

The diversity of terrestrial and freshwater, non-avian, vertebrate fauna of Pulau Tekong, an island used almost exclusively by the Singapore Armed Forces, was compiled. Eighteen species of freshwater fishes, 15 of amphibians, 45 species of terrestrial reptiles, and 31 species of terrestrial mammals were recorded. Singapore records of the lizards: Ptychozoon kuhli, Luperosaurus browni, Cyrtodactylus pantiensis and the bat: Murina suilla are known only from Pulau Tekong. The island also has populations of the frogs: Limnonectes paramacrodon and Occidozyga sumatrana; the snakes: Lycodon subcinctus, Boiga jaspidea and Tropidolaemus wagleri; the lizard: Cnemaspis peninsularis, the slow loris: Nycticebus coucang, and the bats: Rhinolophus trifoliatus and Kerivoula hardwickii. These species are locally rare, and otherwise known only from the mature forests of the Central Catchment and Bukit Timah Nature reserves on Singapore Island. Pulau Tekong also supports populations of the leopard cat: Prionailurus bengalensis, the Sunda slow loris: Nycticebus coucang, the Malayan porcupine: Hystrix brachyura and the Sunda pangolin: Manis javanica—small mammals that are regarded to be rare and endangered in Singapore.