Sponge
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Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera. They are sessile filter feeders that are bound to the seabed, and are one of the most ancient members of macrob
A stove-pipe sponge
Spongia officinalis, "the kitchen sponge", is dark grey when alive.
Euplectella aspergillum, a glass sponge known as "Venus's flower basket"
Cnidaria
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Cnidaria is a phylum of animals containing over 11,000 species of aquatic invertebrates found both in freshwater and marine environments, including jellyfish, hydroids, sea anemones, corals and some o
Pacific sea nettles, Chrysaora fuscescens
Oral end of actinodiscus polyp
Cerianthus filiformis (Ceriantharia)
Sea anemones (Actiniaria, part of Hexacorallia)