The choanocytes line the inner spongocoel, or body cavity. Water is pulled into the sponge via internal choanocyte cells, which take in water through the sponge’s outer pores. In summary, sponges – or poriferans – do not have a true circulatory system as most animals do. The majority of sponges are marine, living in seas and oceans. Sponge larvae are able to swim however, adults are non-motile and spend their life attached to a substratum through a holdfast. Phylum Porifera (“pori” = pores, “fera” = bearers) are popularly known as sponges.
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