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Welcome to the Treatise on Invertebrate Paleontology!
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Demospongea
Demospongiae
Hexactinellida
Porifera - Class, Order and Family Uncertain
Heteractinida
Uncertain
Archaeocyatha
Calcarea
Stromatoporoidea
Porifera - Class Uncertain
Porifea - Class Uncertain but morphologically similar to Archaeocyatha or Radiocyatha
Cribricyathia
and Order
