Geosesarma malayanum
Encyclopedia
Geosesarma malayanum is a species of small red crab
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...

 which is found in Malaysia. It is famous for its relationship with pitcher plants: as such, it is classified as a nepenthephile. G. malayanum is known to visit Nepenthes ampullaria
Nepenthes ampullaria
Nepenthes ampullaria , the Flask-Shaped Pitcher-Plant, is a very distinctive and widespread species of Nepenthes, present in Borneo, Sumatra, Thailand, Peninsular Malaysia, Singapore, the Maluku Islands, and New Guinea...

plants and raid the pitchers of their contents. It uses its claws to crush and consume the drowned prey. However, it has been reported that the crabs are occasionally trapped by pitchers in Brunei
Brunei
Brunei , officially the State of Brunei Darussalam or the Nation of Brunei, the Abode of Peace , is a sovereign state located on the north coast of the island of Borneo, in Southeast Asia...

.
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