Invertebrate Paleontology
Asconoid
Syconoid
Leuconoid
Choanocytes
Pinacocytes
Amoebocytes
Calcareous Spicules
Siliceous Spicules
Class Calcarea
Class Hexactinellida
Class Demospongea
Morphology and Structure
Paleoecological Role
Skeletal Structure
Role in Paleozoic Reefs
Environmental Preferences
Stratigraphic Distribution
Role in Ancient Ecosystems
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3. Taphonomy
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5. Phylum Cnidaria