Meet the 'mold pigs,' a new group of invertebrates from 30 million years ago. ScienceDaily. Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2019 / 10 / 191008125604.htm.

The mold pigs can't be placed in any group of currently existing invertebrates ... About 100 micrometers long, the mold pigs had flexible heads and four pairs of legs.

The Hidden World of Aquatic Invertebrates Season 5 Episode 5 | 26m 46s Video has Closed Captions | CC Tony dives into the hidden world of tiny, sometimes microscopic creatures.