appearance cephalopods cold colors colours cool display displayed fish market food for sale fresh home cooking ice marine cephalopods market on ice ready for purchase sea food selection shapes shopping Sizes skin smell Squid teuthida textures varieties wet wet market bundled bundles dehydrated dried edible medicinal medicine rough surface textured tough flattened ammonite ancient cephalopod chambers creature Crustacean crystals evolution extinct fossil mollusk nautilus rock sea shell arms bilaterally symmetric calamari fried octopus tentacles invertebrates moist mollusc mottled octopoda octopus seafood Slime spots suckers suction cups tentacles texture background wallpaper