Placoderms

Appears in3 items

• 
  History of the Universe1 item
  • Late Devonian extinction372 Ma
• 
  The Big Five Mass Extinctions2 items
  • Devonianc. 419.62 Ma
  • Hangenberg crisis359.2 Ma

Sources

1. ArticleEnd-Devonian extinction and a bottleneck in the early evolution of modern jawed vertebrates
2. ArticleThe global Hangenberg Crisis (Devonian–Carboniferous transition): review of a first-order mass extinction