placodermi

placodermi were among the earliest jawed vertebrates to appear on earth.

most fossils of placodermi have been discovered in marine sedimentary rocks.

the class placodermi is entirely extinct, vanishing during the devonian period.

scientists study placodermi to understand the evolutionary history of armored fish.

dunkleosteus is the most famous and formidable member of the placodermi.

the heavy bony plates characteristic of placodermi distinguished them from modern sharks.

paleontologists often classify ancient fish fossils into the group placodermi.

the sudden extinction of placodermi allowed early sharks to diversify rapidly.

distinctive head and thorax shields protected the body of placodermi.

research suggests that some placodermi gave birth to live young.

the geological record indicates that placodermi dominated the devonian seas.

unlike modern bony fish, placodermi lacked true teeth but had sharp plates.