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Cross section through a dead men's finger (sea sponge)

Legend:

1  coenenchym / mesoglea
2  septa
3  coelenteron
4  retracted tentacles
5  ovaries (+ egg cells)

English name: dead men's fingers
Scientific name: Alcyonium digitatum
Familia: Alcyoniidae
Classis: Anthozoa
Phylum: Cnidaria
Regnum: Animalia