Secrets Emerge From a Fossil’s Taco Shell-Like Cover The New York TimesMeet this 500 million-year-old, taco-shaped marine creature that has 30 pairs of legs CBC.caAncient Arthropod Was Shaped Like a Taco and Swam Upside-Down Gizmodo500-Million-Year-Old ‘Alien Fish Taco’ Was among First Creatures with Jaws Scientific AmericanTaco-shaped arthropod fossils give new insights into the history of the first mandibulates Phys.org