This note examines the species composition, abundance, and sediment grain size relationships of myodocopid ostracods from a nearshore area of the eastern Gulf of Mexico in the vicinity of Marco Island, Florida. All samples were collected as part of a beach renourishment monitoring program which commenced during February 1990. Borrow sites, the source of the sand for renourishment, and reference locations were situated in passes north (Big Marco) and south Caxambas) of the outer coastline of Marco Island. Renourishment took place over 4.25 km of beach. Data discussed in this note are from three post-renourishment sampling periods.