Please help to correct a short text! Phylum: Mollusca Class: Bivalvia The bivalve mollusks are animals whose soft body is usually protected by the right and left (upper and lower) valves. They include such well-known representatives as oysters, mussels, scallops and freshwater mollusks (Unio)1. However, there are bivalve mollusks of another form. The vivid representatives of this group are marine shipworms. Their valves were transformed into small plates in the anterior part of the animal, and the body acquired a worm-like shape. The converted plates serve to drill a passage in the wood, and the course itself is cemented with lime. Many species of bivalve mollusks are edible; some species are used for pearls. In the Barents Sea there are about 150 species of bivalve mollusks. However, in reality, only 54 species were caught in commercial bottom trawls with a fine mesh insert during 11 years of observations, of which only 20 were found in large numbers. Most species of bivalve mollusks either live on unsuitable for trawling places (tidal zone, hard ground with boulders), or too small for a delay in the trawl net. Almost all bivalve mollusks of the adult stage are well distinguished by the appearance of the shell. It is usually enough to look at the photograph to identify the species belonging to the specimen2. Exceptions are damaged individuals or some closely related species. In such cases, in place of the species, you can write Bivalvia or "similar to ...", where in place of the dots put the name of the species that it is most similar to the sample in question. The structure of the shell of a bivalve mollusk (according to Scarlato, 1976): 1 - crown, 2 - ligament (ligament), 3 - concentric ribs, 4 - radial ribs Cartogram of biomass distribution of Bivalvia (kg / mile of trawling)