Placodermi was the first jawed fish. Their jaws probably evolved from the first gill arch.
What is a jawed fish called?
Jaw fish include cartilaginous fish and teleost fish. Cartilaginous fish include sharks, rays and skates. Cartilaginous fish have a skeleton made of cartilage that is lighter and more supple than bone. These types of fish usually have movable jaws armed with well-developed teeth.
What was the earliest fish?
The first fish were primitive jawless fish (Agnasan) that emerged in the early Cambrian, but were generally rare until the rapid evolution of the Silurian and Devonian.
What was the first placodermi?
& gt;The first officially described Silurian placodermi is Simenorepis, an anti-arch known from the uniquely decorated plate of the late Llandovery in Hunan, China. ..
What was the first gnathostomata?
Occurred in the Silurian period when jawless fish peaked. These first gnathostomata were saltwater fish whose head and chest were generally covered with bone plates. They prospered in the Devonian and became extinct in the Carboniferous.
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