DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of a fossilised marine sponge spicule from Oamaru, New Zealand. Sponge spicules are found in most sponges. They act as the structural support of sponges and deter predators. Spicules can be found in a wide range of symmetry types. They can be made of calcium carbonate, silica dioxide or spongin. Spicules are formed by sclerocytes, which are derived from archaeocytes. There are 4 main types of spicules: monaxons, triaxons, tetraxons and dendroclones. Magnification: x2,200 when shortest axis printed at 25 millimetres.
Model release not required. Property release not required.