Asymmetron References Asymmetron invertebrate genus Ask Anything Homework Help Also known as: Epigonichthyes Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of EncyclopĂŠdia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: amphioxusâŠAmphioxus) and Epigonichthyes (also called Asymmetron)âwith about two dozen species. The chordate featuresâthe notochord (or stiffening rod), gill slits, and dorsal nerve cordâappear in the larvae and persist into adulthood. Read MoreâŠAmphioxus) and Epigonichthyes (also called Asymmetron)âwith about two dozen species. The chordate featuresâthe notochord (or stiffening rod), gill slits, and dorsal nerve cordâappear in the larvae and persist into adulthood. Read More