From January to December 2015, species of Pelecypoda were collected in different biotapos of Reina beach in the district of Montijo, province of Veraguas, these are in the National Reference Collection of the Museum of Malacology of the University of Panama (MUMAUP). It is located at 7 ° 37'16.99 "LN and 80 ° 59'42.79" LO; The beach has an extensive rocky coastline comprised of rocks and rocks, a small area where the mangroves are, few sandy sections with patches of mud, sand and mud-sand, the water is very cloudy, and Is full of much sediment. The specimens were obtained from six biotopes (mud-sand, sand, stones, rocks, mangrove and mud roots); With a total of 4 694 individuals, 45 species, 38 genera, 19 families, 14 superfamilies and 10 orders; 16 species were in mud-sand and 18 in sand, both places of the sandy coast. There were examples of economic importance, such as Carditamera affinis (GB Sowerby I 1833), Mytella bicolor (Bruguière 1792), Pinctada mazatlanica (Hanley 1856) and Saccostrea palmula Carpenter 1857. As this is a beach with a large rocky coastline, Bivalves dominated in the area were adapted to the strong waves, many of them reproduce in large quantities in the Sand and Fango-Arena because they are excavators, many drill the rock to escape from the predators, also to avoid drying and Some are attached to the hard biotope.