coup de grÃ¢ce in British English. See all translations. coup de grÃ¢cenoun [ S ] uk â /ËkuË dÉ ËÉ¡rÉËs/ us â /ËkuË dÉ ËÉ¡rÉËs/ formal. âº an action that ends something that has been gradually getting worse, or that kills a person or animal in order to end their suffering: Jane's affair was the coup de grÃ¢ce to her disintegrating marriage. Thesaurus: synonyms and related words.
Bivalves is a class of marine and freshwater molluscs with about 30,000 species including scallops, clams, oysters, razor shells, shipworms and mussels. Most bivalves are marine usually found in shallower water but some live in brackish and freshwater.
Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. About 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters.They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface.Starfish are marine invertebrates.he tube feet, spines and pedicellariae are sensitive to touch. The tube feet, especially those at the tips of the rays, are also sensitive to chemicals, enabling the starfish to detect odour sources such as food. There are eyespots at the ends of the arms, each one made of 80â200 simple ocelli.