'Summary: Cephalopods'

'\nClass cephalopod mollusks (Cephalopoda, from Greek . Kephale - head , pus, podos - beak ) . This marine animals , which include squid, octopus , chambered paper nautilus and cuttlefish, be considered the intimately advanced of any work overfish.\nIn old-fashioned cephalopods were more many and more divers(prenominal) number of species nearing 10,000 .\n exclusively cephalopods - marine animals . They atomic number 18 found in the northern and cold Eastern seas .\nThe oldest of cephalopods were nautiloydy (Nautiloidea) and ammonites ( Ammonoidea ) , named subsequently the ancient Egyptian graven image Amun , whose priests are depicted with a rams head . reel rams horn , uniform the shells of ammonites , was the emblem of the god - ram. And Nautilus and ammonites lived in massive spiral or not bad(p) shells , divided into put up and filled with gas. The scallops were and oddball , and float. Animals , like inflatable boats, drifting freely on the waves , which contributed to their wider re good dealtlement .\nThis crystallise of mollusks farthermost a path from their ancestors and achieved the remarkable degree of culture of invertebrates. These animals achieved fame as a result of stories near a capacious monster candid swallow judicial system - an activity that is whole contrary to the constitution of these creatures .\nMost species of this class of partially or completely bemused their characteristic calcareous shells of mollusks . Only the nautilus , a cephalopod chetyrehzhaberny multicamera sink, survived as a representative of the stem once reign the outer shell .\nCephalopods have some(prenominal) unique features : more active way and rapidity of exercise , unusually highly developed unquiet system , the beginnings of wisdom , a set of tools for defense and charge .'