[3][4] It is the longest bivalve mollusc in the world, where the only known permanent natural habitat is Kalamansig, Sultan Kudarat in the Philippines.

They came from rocks in various tropical and sub-tropical areas including Indonesia, Pakistan, Jamaica, Grenada, South Africa and Somalia.

[2] Fossils of the extinct species, Kuphus incrassatus, have been found in rocks in Jamaica, Mexico, Panama, Puerto Rico, Trinidad and Tobago, Florida and Mississippi.

[10] Fossils of the extinct species, Kuphus fistula, dating from the Miocene and Pliocene, have been found in various locations in Virginia in the United States.

Fossils found near Warsaw by paleontologist, Friedrich von Huene in 1941 were misidentified as being the teeth and parts of the jaw of a new species of dinosaur, which he named Succinodon putzeri.