The thick outer skin or periostracum of an ark clam can act as camouflage, such that the shells can sometimes look like stones when lying on the bottom.

All ark shells have a long straight hinge line with a single row of numerous small and unspecialized "teeth".

Ark Clams are broadcast spawners, that is, eggs and sperm are released into open water where fertilization occurs.

Tegillarca granosa was used as a food by Indigenous peoples living on the northern Australian coastline through at least the past ~4500 years, with extensive evidence preserved in the form of shell mound sites.

[4] In the U.S. limited quantities of wild ark clams have been harvested in North Carolina and Virginia for ethnic markets and aquaculture has been explored.

[1] To maintain the Ark Clam fishery, several communities in Fiji are imposing a minimum size limit of 3 cm, closures during spawning periods, and establishing "no-take" areas.