click below
click below
Normal Size Small Size show me how
Vertebrate Zoology
Placoderms (Extinct: First Gnathostomes)
Question | Answer |
---|---|
Time Period of Placoderms | Silurian and Devonian |
Characteristics of Placoderms | Notochord; Carapce and dermal bone; Jaws; Cartilage; Bony plates for teeth; Yolk sac and embryo; Benthic |
Examples: | Dunkleosteus, largest Devonian predators; Materpiscis attenboroughi, embryo with yolk sac and umbilical cord, viviparity |