Cephalaspis
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Cephalaspis is a possibly monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in the early Devonian.
Ostracoderm digital recreation
Cephalaspis lyellii reconstruction
Cephalaspis lyelli fossil
Cephalaspis lyelli fossil
Osteostraci
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The class Osteostraci is an extinct taxon of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian.
Cephalaspis
…Cephalaspis (from Greek: κεφαλή kephalḗ, 'head' and Greek: ἀσπίς aspís, 'shield') is a possibly monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in the early Devonian. Like its relatives, Cephalaspis was heavily armored…
Cephalaspis species
Parameteoraspis fossilized headshield