Near an island in the South Pacific Ocean, a bright red sea creature with “canine-like” teeth swam around the coral reef.

Inside, they found a “large”-eyed sea creature with “needle-like” spines on its tail. It turned out to be a new species. Scientist Karl Wittmann spent over a decade scuba diving at islands ...

Sea urchins move across the sea floor using their spines. Each spine is attached to the test by muscle and the spine bases are articulated via a ball and socket joint. Walking is effected by ...