This 15 August 2018 video says about itself:
This New Species of Pygmy Seahorse is the Size of a Lentil | Nat Geo Wild
This pygmy seahorse is tiny—the size of a grain of rice. Researchers recently discovered that the colorful animal is a distinct species. Its name is Hippocampus japapigu, Latin for “Japan pig” seahorse, as some believe it resembles a baby pig.