What is another word for Order Anaspida?
Pronunciation: [ˈɔːdəɹ ˈanaspˌɪdə] (IPA) 
Order Anaspida comprises a group of primitive jawless fish that lived in freshwater and marine environments during the early to mid-Silurian period. They had a slim, elongated body with a distinctive dorsal fin and lacked paired fins and jaws. Some of the synonyms for the term "Order Anaspida" include the following: Osteostraci, Heterostraci, Pteraspidomorphi, and Thelodonti. These synonyms primarily refer to different types of jawless fish that existed during the same time period and shared similar characteristics, such as the absence of jaws and paired fins. Despite being extinct for millions of years, the fossils of Anaspida and its synonyms continue to provide valuable insights into the evolution of early fish species.
