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n.1.(Zool.) Any marine bivalve shell of the genus Mactra, and allied genera. Many species are known. Some of them are used as food, as Mactra stultorum, of Europe. See Surf clam, under Surf.
References in periodicals archive ?
Microsatellites reveal fine-scale genetic structure of the Chinese surf clam Mactra chinensis (Mollusca, Bivalvia, Mactridae) in northern China.
Examples of bivalves inhabit intertidal sandy flats and sandy beaches are Glycymeris, Ctena, Divalinga, Cardites, Acrosterigma, Mactra, Asaphis, Hiatula, Circe, Circenita, Gafrarium, Calista, Dosinia and Maria.
It is also noteworthy that 51 species (14 bivalves and 37 gastropods) recorded in the field survey component of the present study were not known from Australian Museum records to occur within 20 km of Shelly Beach, including several large and relatively common species such as Mactra contraria, Donax deltoides, Scutus antipodes, Turbo torquatus and Astralium tentoriiformis.
The highest number of species has been recorded in the Aalensis (36 species) and the Opalinum (also 36 species) subzones, but the assemblage displaying higher amount of identified species (MP-3) corresponds to the Mactra Subzone.
The Sarmatian, the youngest formation of Istanbul is composed of three lithological levels from the bottom to the top: Mactra Limestone, Clays and marls and Sands and gravel.
This is the case with the species Mitra cornicula--of which the only example identified was altered in this way--, Dosinia exoleta--two of the remains were thermo-altered-and Mactra glauca and Mactra sp.
dominicense Gabb, 1873 * * Mactridae Mactra estrellana Olsson, 1922 * Tellinidae Eurytellina aequicincta (Spengler, 1900) * Veneridae Chione hendersoni Dall, 1903 * Ventricolaria sp.
ANU-2020 600 Mactra abbreviata Wk-17747 555 charcoal ANU-2022 270 charcoal ANU-2020 290 charcoal ANU-2023 131.
Associated with the period of mound formation in the study area, between approximately 2500 and 500 calBP there was a decline in the relative abundance of species from the shallow water, hard substrate areas and an increasingly heavy reliance on species from the sand and mud flats, particularly Anadara granosa and Mactra abbreviata, with some variability in the use of species from the mangroves through time depending on site location.
Effects of water temperature, salinity and substrata on burrowing behaviors of the three bivalves, Pseudocardium sachalinensis, Mactra chinensis, and Ruditapes philippinarum.