Roughly 560 million years ago, the first striated muscular system appeared in the cnidarian ancestor of jellyfish and corals. Haootia quadriformis, which lived anchored to the sea floor, likely used its new muscle fibers to grasp food, an…
Roughly 560 million years ago, the first striated muscular system appeared in the cnidarian ancestor of jellyfish and corals. Haootia quadriformis, which lived anchored to the sea floor, likely used its new muscle fibers to grasp food, an…