Mactra
Mactra is a genus of saltwater clams, marine bivalve molluscs belonging to the family Mactridae. These clams are characterized by their equivalve shells, meaning both valves are of equal size and shape, and their ovate to trigonal outline. The shells are typically smooth or finely ribbed and often exhibit a shiny periostracum, a thin, organic outer layer.
Species within the Mactra genus are found in marine environments worldwide, inhabiting sandy or muddy substrates
The genus Mactra is a well-established taxonomic group, though some species have been reclassified into related