What Did Ostracoderms Evolve from?

During the late Cambrian, eel-like jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared. Most jawless fish are now extinct; but the extant lampreys may approximate ancient pre-jawed fish.

What did jawless fish evolve from?

Jawless fishes probably arose from ancient, small, soft-bodied filter-feeding organisms much like and probably also ancestral to the modern sand-dwelling filter feeders, the Cephalochordata (Amphioxus and its relatives). The body in the ancestral animals was probably stiffened by a notochord.

Are conodonts ostracoderms?

Are conodonts Ostracoderms? Conodonts are considered a type of jawless fish becuase even though they have a complex feeding mechanism with teeth, their “jaws” operate very differently from later vertebrates whose jaws have developed by modification of a pair of gill arches. Ostracoderms – early jawless armored fishes.