The members of the family Ostreidae are the true oysters, and include all the species that are commonly eaten under the title "oyster". They do not include the Pearl Oysters; these species are only distantly related to the true oysters, since although they are also bivalves, they are members of the family Pteriidae, in the order Pterioida. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa {trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (flatworms, echinoderms, etc. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ... Orders Subclass Protobranchia Solemyoida Nuculoida Subclass Pteriomorphia - oysters Arcoida Mytiloida Pterioida Subclass Paleoheterodonta - mussels Trigoinoida Unionoida Subclass Heterodonta - clams, zebra mussels Veneroida Myoida Subclass Anomalosdesmata Pholadomyoida Animals of the Class Bivalvia are known as bivalves because they typically have two-part shells, with both parts being more or less symmetrical. ... Binomial name Crassostrea virginica Gmelin, 1791 The Eastern Oyster Crassostrea virginica is a species of oyster that is found on the eastern seaboard of North America. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... In biology, the most commonly used definition of species was first coined by Ernst Mayr. ... Look up Oyster in Wiktionary, the free dictionary The name oyster is used for a number of different groups of molluscs which grow for the most part in marine or brackish water. ... Species Pinctada maxima Pinctada margaritifera Pinctada fucata Pinctada radiata Pinctada albina Pinctada virens Pinctada chemnitzi Pinctada maculata Pinctada nigra Pinctada atropurpurea Pinctada laosensis Pinctada martensi The Pearl Oysters are the genus Pinctada of bivalve molluscs. ... Orders Subclass Protobranchia Solemyoida Nuculoida Subclass Pteriomorphia - oysters Arcoida Mytiloida Pterioida Subclass Paleoheterodonta - mussels Trigoinoida Unionoida Subclass Heterodonta - clams, zebra mussels Veneroida Myoida Subclass Anomalosdesmata Pholadomyoida Animals of the Class Bivalvia are known as bivalves because they typically have two-part shells, with both parts being more or less symmetrical. ...

Like scallops (family Pectinidae), true oysters have a central adductor muscle, which means that the shell has a characteristic central scar, marking its point of attachment. Oysters have a larger adductor muscle than scallops. Their shell shape tends to be irregular as a result of attaching to other objects. Genera See text Scallops are the family Pectinidae of bivalve molluscs. ... Genera Pecten Pedum Amusium Chlamys Decatopecten Argopecten Flexopecten Lissopecten Hyalopecten Nodipecten Patinopecten Semipallium Mimachlamys Equichlamys Mesopeplum Veprichlamys Notochlamys Delectopecten Cryptopecten Anguipecten Haumea Mirapecten Volachlamys Juxtamusium Annachlamys Gloripallium Excellichlamys Bractechlamys Minnivola Coralichlamys Serratovola Somalipecten Pseudohinnites Glorichlamys Scallops are the family Pectinidae of bivalve molluscs. ... ...

Members of genus Ostrea generally live continually immersed in sea water, brood their fertilized eggs for various proportions of the period from fertilization to hatching and are quite flat with roundish shells. They differ from most bivalves by having shells completely comprised of calcite but with internal muscle scars of aragonitic composition. They do best in water with a not too thick concentration of phytoplankton. Calcite from Brushy Creek Mine, Missouri, USA. The carbonate mineral calcite is a calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earths surface. ... Aragonite Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. ... Diagrams of some typical phytoplankton Phytoplankton refers to the autotrophic component of the plankton that drifts in the water column. ...

Members of genera Saccostrea and Crassostrea generally live in the intertidal zone, broadcast sperm and eggs into the sea and can thrive in water which is very rich in phytoplankton. One of the most commonly cultivated oysters is Saccostrea gigas, the Japanese oyster, which is ideally suited for oyster cultivation in seawater ponds. The foreshore, also called the intertidal or littoral zone, is that part of a beach that lies between average high tide and average low tide. ...

Both oviparous (egg bearing) and larviparous (larvae bearing) species are known within the Ostreidae. Both types are hermaphrodites. However, the larviparous species (which include the Edible Oyster Ostreia edulis) show a pattern of alternating sex within each individual, whereas the oviparous species (such as the Eastern Oyster Crassostrea virginica) are simultaneous hermaphrodites producing either female or male gametes according to circumstances. The 1st-century BC sculpture The Reclining Hermaphrodite, in the Museo Palazzo Massimo Alle Terme in Rome In zoology, a hermaphrodite is an organism of a species whose members possess both male and female sexual organs during their lives. ... Binomial name Crassostrea virginica Gmelin, 1791 The Eastern Oyster (Crassostrea virginica) is a species of oyster that is found on the eastern seaboard of North America. ... Gametes (in Greek: γαμέτες) —also known as sex cells, or spores—are the specialized germ cells that come together during fertilization (conception) in organisms that reproduce sexually. ...