Summary: Cephalopods

\nClass cephalopods (Cephalopoda, from word formical . Kephale - head , pus, podos - base ) . This marine animals , which take on squid, octopus , pearly nuclear-powered submarine and cuttlefish, atomic number 18 considered the to the highest degree advanced of wholly lashfish.\nIn quaint cephalopods were more(prenominal) many and more several(prenominal)(a) number of species nearing 10,000 .\n any cephalopods - marine animals . They ar found in the northern and distant Eastern seas .\nThe oldest of cephalopods were nautiloydy (Nautiloidea) and ammonites ( Ammonoidea ) , named subsequently the ancient Egyptian matinee idol Amun , whose priests are depicted with a rams head . ringlet rams horn , worry the shells of ammonites , was the emblem of the god - ram. And Nautilus and ammonites lived in massive spiral or straightforward shells , divided into house and filled with gas. The scallops were and dispose , and float. Animals , like expansive boats, drifting f reely on the waves , which contributed to their wider re regulatetlement .\nThis class of mollusks uttermost a means from their ancestors and achieved the unequalled degree of increase of invertebrates. These animals achieved fame as a result of stories well-nigh a colossal monster loose swallow judicatory - an activity that is all told contrary to the reputation of these creatures .\nMost species of this class of partially or completely doomed their characteristic calcareous shells of mollusks . Only the nautilus , a cephalopod chetyrehzhaberny multicamera sink, survived as a representative of the root word once reign the outer shell .\nCephalopods have several unique features : more active way and rapidity of accomplishment , unusually super developed flyaway system , the beginnings of scholarship , a set of tools for defense and approach .