Coloured X-ray of the Nautilus shell
Nautilus shell. Coloured X-ray of the cephalopod shell, Nautilus pompilius. This is the common chambered or pearly Nautilus. The shell is empty of contents, with inner chambers and spiral whorls visible. The external colour of the shell is off- white, with radial bands of a tan colour. The siphuncle tube is clearly seen here, passing from one shell chamber to another; this internal tube fills the chambers with gas and enables the Nautilus to float or sink. There are only 6 living species of Nautilus, descended from a large group which originated in the early Palaeozoic era. The animal resembles a squid in having a foot of many tentacles. It feeds on crabs and carrion.
© D.ROBERTS/SCIENCE PHOTO LIBRARY
Wonderpus octopus (Octopus sp.) hunting on the seabed. This octopus changes its body shape and colour to confuse predators. It can take the form of a flatfish, sea snake, shrimp, jellyfish, crab, lionfish and many others. It can also mimic the movements of its chosen model. Photographed in Lembeh Strait, North Sulawesi, Indonesia.
© GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY
A Giant rock scallop (Crassadoma gigantea) encrusted with
A Giant rock scallop (Crassadoma gigantea) encrusted with and surrounded by several other invertebrates animals, including White anemones (Metridium sp.), White mushroom ascidians (Distaplia sp.), Red soft coral (Gersemia sp.), unidentified yellow sponges, and a sea cucumber. Seven Tree Island, Browning Pass, Queen Charlotte Strait, British Columbia, September.