The placoderms were a large and diverse group of distinctive fossil fishes, now thought to be the most primitive known vertebrates with jaws. Placoderm fossils from the Late Devonian Gogo Formation of Australia (about 380 million years ago) show a new species of placoderm, the specimen preserved with a single, large embryo connected to the adult by a mineralized remnant of an umbilical cord.
- John A. Long
- Kate Trinajstic
- Tim Senden
