Agnatha Collection

Doryaspis swim amongst a bed of Anthozoa
8-inch-long jawless fish of the genus Doryaspis swim amongst a bed of Anthozoa of the order Actiniaria (AKA sea anemones) 410 million years ago in what is today the Svalbard archipelago in Norway

Illustration of three types of fish, Bony fish (Osteichthyes), Cartilaginous fish (Chondrichthyes), and Jawless fish (Agnatha)

Ctenaspis is a jawless fish from the Early Devonian of Norway
Ctenaspis dentata is a jawless fish from the Early Devonian of Norway

Illustration of Jawless Fish (Agnatha)

Prehistoric Pteraspis jawless fish swimming with a group of Chelmon Butterflyfish
Pteraspis is an extinct genus of jawless ocean fish that lived in the Devonian period, seen here with a group of Chelmon Butterflyfish

Pteraspis is an extinct genus of jawless ocean fish that lived in the Devonian period

Pteraspis is an extinct genus of jawless fish that lived in the Devonian Period

Cephalaspis lyelli jawless fish from the Early Devonian of Scotland

Doryaspis, an extinct genus of primitive jawless fish from the Devonian Period
Doryaspis, an extinct genus of primitive jawless fish that lived in the ocean during the Devonian Period

Anglaspis is a heterostracan from the Early Devonian of Norway
Anglaspis heintzi is a heterostracan from the Early Devonian of Norway

Doryaspis jawless fish from the Devonian Period
Doryaspis is an extinct primitive jawless fish that fed on plankton in the Devonian Period of Norway

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In the depths of the ancient oceans, a mesmerizing world unfolded. Amongst a vibrant bed of Anthozoa, Doryaspis gracefully swam, its sleek body gliding through the currents. This extinct genus of primitive jawless fish thrived during the Devonian Period, leaving behind fascinating fossils that tell tales of their existence. Illustrations showcase three distinct types of fish that inhabited these prehistoric waters. Bony fish (Osteichthyes), with their intricate skeletons and scales, coexisted alongside cartilaginous fish (Chondrichthyes), known for their flexible bodies and sharp teeth. And then there were the jawless fish (Agnatha), like Ctenaspis and Pteraspis, who relied on suction feeding to survive. Pteraspis, an extinct genus of jawless ocean fish from the Devonian period, was particularly captivating in its appearance. Swimming alongside Chelmon Butterflyfish in ancient times, it possessed a unique armor-like structure that protected its vulnerable body. Another remarkable member of this diverse group was Cephalaspis lyelli—a jawless fish discovered in Scotland's Early Devonian rocks. Its peculiar head shield distinguished it from other species and provided valuable insights into evolutionary adaptations over time. Within this vast array of creatures emerged Anglaspis—an intriguing heterostracan found in Norway's Early Devonian deposits. Its presence further emphasized the incredible diversity within Agnatha. As we delve into Earth's history, we uncover more about these enigmatic beings called Agnatha—jawless fishes that once dominated primordial seas. From Doryaspis to Pteraspis and beyond, they remind us how life has evolved over millions of years—a testament to nature's boundless creativity and resilience.