Query: Middle Ordovician animals or Ordovician animals of South and North America
Domain: animals
Relevant documents:
Astraspida
Eriptychiida
Eosomichelinoceras
Sacabambaspis
Cuyopsis
Trigonoconcha
Whiteavesia
Adamsoceras
Bactroceras
Appalachignathus
Acodus
Astraspis
Dichograptus
Didymograptus
Lingulella
Villicumia
Tetragraptus