mollusca nautilus pompilius

alive ancient animal aquarium aquatic auratus background beautiful bilateral biology blue brown camouflage cephalopod cephalopods chamber chambered countershading drift equiangular form fossil genus gold golden helix life living marine modern mollusca molluscan nature nautilidae nautilus ocean organism ornamentation pattern pearly pompilius profile sea seawater shell ship sphere spiral strange swimming symmetry tank tentacles wallpaper water white with