Sason sundaicum is a species of barychelid

Barychelidae

The Brushed trapdoor spiders are a spider family with about 300 species in 44 general. This family is the only family in superfamily Barycheloidea....

 trapdoor spider

Spider

Spiders are air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms...

s that is found on trees near the sea, usually closer than 100 meters, although distances of up to five kilometers have been observed. They build short nests with two opposing trapdoors, often attached to the bark of living trees, for example Coconut Palms

Coconut

The coconut palm, Cocos nucifera, is a member of the family Arecaceae . It is the only accepted species in the genus Cocos. The term coconut can refer to the entire coconut palm, the seed, or the fruit, which is not a botanical nut. The spelling cocoanut is an old-fashioned form of the word...

. However, sometimes a nest is built on sides of large boulders. Nests of males are up to two centimeters long, those of females up to almost three centimeters. The migid

Migidae

The tree trapdoor spiders are a spider family with about 90 species in 10 genera.These small spiders are not hairy.They build burrows with a trapdoor...

 spider Poecilomigas abrahami from South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

 builds very similar nests.

They are found in parts of Malaysia and Thailand

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

.