What is another word for osteostraci?
Pronunciation: [ˈɒstɪˌɒstɹɐsˌa͡ɪ] (IPA) 
Osteostraci is a term used to describe a subclass of extinct, armored jawless fish that lived during the Silurian and Devonian periods. While there are several other types of ancient fish, some of the synonyms that can be used in place of osteostraci are acanthodians, placoderms, and agnathans. Acanthodians, which lived from the Silurian to the Permian period, were jawed fish with spiny fins. Placoderms, on the other hand, were heavily armored, jawed fish that lived during the Devonian period. Agnathans, also known as jawless fish, lived during the Cambrian to Devonian periods and include species such as lampreys and hagfish. Overall, while osteostraci is a specific type of armored fish, there were many other unique types of fish that existed alongside them.
