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Phylum Porifera
Class Demospongiae
Spongilla gemmules and spicules

Phylum Porifera
Class Calcarea
Grantia spicules

Phylum Cnidaria
Class Hydrozoa
Hydra

Phylum Cnidaria
Class Hydrozoa
Hydra
Budding

Phylum Cnidaria
Class Hydrozoa
Hydra spermary

Phylum Cnidaria
Class Hydrozoa
Hydra Ovaries

Phylum Cnidaria
Class Hydrozoa
Obelia medusa

Phylum Cnidaria
Class Hydrozoa
Polyp stages

Phylum Cnidaria
Class Scyphozoa
Aurelia medusa

Phylum Cnidaria
Class Scyphozoa
Aurelia strobila

Phylum Cnidaria
Class Anthozoa
Metridium

Glass-like spicules of silicon dioxide
Class Hexactinellida

Spicules composed of spongin
Class Demospongiae

Spicules of calcium carbonate
Class Calcarea

Siliceous spicules and spongin
Class Sclerospongiae