Asymmetron Directory References Discover Timeline of the 1990s New Seven Wonders of the World Timeline of the 2000s 10 Best Hockey Players of All Time 7 Deadliest Weapons in History The 10 Greatest Basketball Players of All Time Flags That Look Alike Contents Asymmetron invertebrate genus Also known as: Epigonichthyes Learn about this topic in these articles:classification In amphioxus…Amphioxus) and Epigonichthyes (also called Asymmetron)—with about two dozen species. The chordate features—the notochord (or stiffening rod), gill slits, and dorsal nerve cord—appear in the larvae and persist into adulthood.Read More