How arthropods got their legs
Fossils show flaps that fused to make modern limbs
![ancient arthropod](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/kb_arthopod_main_free.png?fit=860%2C460&ssl=1)
FLAPPING AROUND A newly discovered ancient arthropod had two rows of flaps that later melded into limbs like those sported by lobsters, horseshoe crabs, and other relatives alive today.
Marianne Collins/ArtofFact