Osteostraci
Extinct class of jawless fishes
Osteostraci
The class Osteostraci (meaning "bony shells") is an extinct taxon of bony-armored jawless fish, one of several groups termed "ostracoderms", that lived in what is now North America, Europe and Russia (largely around the former landmass of Euramerica/Laurussia) from the Middle Silurian to Late Devonian.
Read on Wikipedia · Image Petr Menshikov (https://twitter.com/Petr75113553; https://vk.com/prehistoricproduction), CC BY-SA 4.0
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