Anyone who gets the rare opportunity to pet a shark will notice that their skin feels smooth if you run your hand from head to tail, but rough in reverse, thanks to the dermal denticles that protect the animal and make it so hydrodynamic. Scanning electron microscopy images of the species Squatina guggenheim show a tangle of mineralized threads and structures anchoring these denticles inside the skin. This knowledge contributed to the development of sharkskin swimsuits, which have been called a form of technological doping.
Image submitted by Marcela Viliod, an undergraduate student studying
physical education at the Biosciences Institute of São Paulo State University (UNESP) in Rio Claro